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Cisco Security Advisory: Multiple vulnerabilities in Cisco PGW Softswitch
From: Cisco Systems Product Security Incident Response Team <psirt () cisco com>
Date: Wed, 12 May 2010 17:35:00 +0200

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Multiple vulnerabilities in Cisco PGW Softswitch

Document ID: 111870

Advisory ID: cisco-sa-20100512-pgw

http://www.cisco.com/warp/public/707/cisco-sa-20100512-pgw.shtml

Revision 1.0

For Public Release 2010 May 12 1600 UTC (GMT)

- ---------------------------------------------------------------------

Summary
=======

Multiple vulnerabilities exist in the Cisco PGW 2200 Softswitch
series of products. Each vulnerability described in this advisory is
independent from other. The vulnerabilities are related to processing
Session Initiation Protocol (SIP) or Media Gateway Control Protocol
(MGCP) messages.

Successful exploitation of all but one of these vulnerabilities can
crash the affected device. Exploitation of the remaining
vulnerability will not crash the affected device, but it can lead to
a denial-of-service (DoS) condition in which no new TCP-based
connections will be accepted or created.

Cisco has released free software updates that address these
vulnerabilities. There are no workarounds that mitigate these
vulnerabilities.

This advisory is posted at 
http://www.cisco.com/warp/public/707/cisco-sa-20100512-pgw.shtml

Affected Products
=================

Vulnerable Products
+------------------

The Cisco PGW 2200 Softswitch is affected by these vulnerabilities.
The following table displays information about software releases that
are affected by individual vulnerabilities. Each vulnerability in the
table affects all software releases prior to the release that is
listed in the table.

+---------------------------------------+
| Cisco Bug  | Affects All Software     |
| ID         | Releases Prior This      |
|            | Version(s)               |
|------------+--------------------------|
| CSCsz13590 | 9.8(1)S5                 |
|------------+--------------------------|
| CSCsl39126 | 9.7(3)S11                |
|------------+--------------------------|
| CSCsk32606 | 9.7(3)S11                |
|------------+--------------------------|
| CSCsk44115 | 9.7(3)S11, 9.7(3)P11     |
|------------+--------------------------|
| CSCsk40030 | 9.7(3)S10                |
|------------+--------------------------|
| CSCsk38165 | 9.7(3)S10                |
|------------+--------------------------|
| CSCsj98521 | 9.7(3)S9, 9.7(3)P9       |
|------------+--------------------------|
| CSCsk04588 | 9.7(3)S9, 9.7(3)P9       |
|------------+--------------------------|
| CSCsk13561 | 9.7(3)S9, 9.7(3)P9       |
+---------------------------------------+

To determine the software version running on a Cisco product, log in
to the device and issue the RTRV-NE command. This command displays
information about the Cisco PGW 2200 Softswitch hardware, software,
and current state.

The following example identifies a Cisco PGW 2200 Softswitch running
software release 9.7(3):

    mml> RTRV-NE
    Media Gateway Controller  - MGC-01 2010-04-23 11:55:00.000
    M  RTRV
       "Type:MGC (Switch Mode)"
       "Hardware platform:sun4u sparc SUNW,Sun-Fire-V210"
       "Vendor:"Cisco Systems, Inc.""
       "Location:MGC-01 - Media Gateway Controller"
       "Version:"9.7(3)""
       "Patch:"CSCOgs028/CSCOnn028""
       "Platform State:ACTIVE"
       ;

Products Confirmed Not Vulnerable
+--------------------------------

No other Cisco products are currently known to be affected by these
vulnerabilities. In particular, Cisco IOS Software is not affected by
these vulnerabilities.

Details
=======

SIP is a popular signaling protocol used to manage voice and video
calls across IP networks such as the Internet. SIP is responsible for
handling all aspects of call setup and termination. Voice and video
are the most popular types of sessions that SIP handles, but the
protocol is flexible to accommodate for other applications that
require call setup and termination. SIP call signaling can use UDP
(port 5060), TCP (port 5060), or Transport Layer Security (TLS; TCP
port 5061) as the underlying transport protocol.

MGCP is the protocol for controlling telephony gateways from external
call control elements known as media gateway controllers or call
agents. A telephony gateway is a network element that provides
conversion between the audio signals carried on telephone circuits
and data packets carried over the Internet or other packet networks.

Multiple DoS vulnerabilities exist in the Cisco PGW 2200 Softswitch
SIP implementation, and one vulnerability is in the MGCP
implementation.

The following vulnerabilities can cause affected devices to crash:

  * CSCsl39126 (registered customers only), CVE ID CVE-2010-0601
  * CSCsk32606 (registered customers only), CVE ID CVE-2010-0602
  * CSCsk40030 (registered customers only), CVE ID CVE-2010-0603
  * CSCsk38165 (registered customers only), CVE ID CVE-2010-0604
  * CSCsk44115 (registered customers only), CVE ID CVE-2010-1561
  * CSCsj98521 (registered customers only), CVE ID CVE-2010-1562
  * CSCsk04588 (registered customers only), CVE ID CVE-2010-1563
  * CSCsz13590 (registered customers only), CVE ID CVE-2010-1567

The following vulnerability may cause an affected device to be unable
to accept or create a new TCP connection. Existing calls will not be
terminated, but no new SIP connections will be established. If
exploited, this vulnerability will also prevent the device from
establishing any new HTTP, SSH or Telnet sessions.

  * CSCsk13561 (registered customers only), CVE ID CVE-2010-1565

Vulnerability Scoring Details
=============================

Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this security advisory is done in accordance with CVSS
version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding
CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss

CSCsl39126 - Malformed MGCP packet can crash device 

CVSS Base Score - 7.8
  Access Vector           Network
  Access Complexity       Low
  Authentication          None
  Confidentiality Impact  None
  Integrity Impact        None
  Availability Impact     Complete

CVSS Temporal Score - 6.4
  Exploitability          Functional
  Remediation Level       Official Fix
  Report Confidence       Confirmed

CSCsk32606 - Malformed SIP packet can crash device 
CSCsk40030 - Malformed Session Attribute can crash device
CSCsk38165 - Device crash during SIP testing
CSCsk44115 - Device crash while processing overly long message
CSCsj98521 - Device crash while processing malformed Contact Header
CSCsk04588 - Device crash while processing malformed header
CSCsz13590 - Malformed SIP header can crash device

CVSS Base Score - 7.8
  Access Vector           Network
  Access Complexity       Low
  Authentication          None
  Confidentiality Impact  None
  Integrity Impact        None
  Availability Impact     Complete

CVSS Temporal Score - 6.4
  Exploitability          Functional
  Remediation Level       Official Fix
  Report Confidence       Confirmed

CSCsk13561 - Exhaustion of TCP sockets prevents device from accepting
             new connections

CVSS Base Score - 7.8
  Access Vector           Network
  Access Complexity       Low
  Authentication          None
  Confidentiality Impact  None
  Integrity Impact        None
  Availability Impact     Complete

CVSS Temporal Score - 6.4
  Exploitability          Functional
  Remediation Level       Official Fix
  Report Confidence       Confirmed

Impact
======

Successful exploitation of all but one vulnerability in this advisory
can crash the affected device. The remaining vulnerability will not
crash the affected device, but it can lead to a DoS condition in
which no new TCP-based connections will be accepted or created.

Software Versions and Fixes
===========================

When considering software upgrades, also consult 
http://www.cisco.com/go/psirt and any subsequent advisories to 
determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center (TAC) or your contracted
maintenance provider for assistance.

All vulnerabilities listed in this Security Advisory are addressed in
Cisco PGW 2200 Softswitch version 9.7(3)S11, version 9.8(1)S5, and
subsequent, software releases.

Workarounds
===========

There are no workarounds for the vulnerabilities in this advisory.

In the case of the vulnerability that corresponds to Cisco Bug ID
CSCsk13561, administrator must manually reboot the affected device to
restore the device's ability to accept new connections. Because
vulnerability prevents new TCP-based session to be created, this
reboot can be initiated only from the console. If a failover device
is configured, existing sessions will continue while the affected
device is reloading. Without a failover device, all active sessions
will be terminated while the affected device is reloading.

Additional mitigation techniques that can be deployed on Cisco
devices within the network are available in the Cisco Applied
Mitigation Bulletin companion document for this advisory: 
http://www.cisco.com/warp/public/707/cisco-amb-20100512-pgw.shtml

Obtaining Fixed Software
========================

Cisco has released free software updates that address these
vulnerabilities. Prior to deploying software, customers should
consult their maintenance provider or check the software for feature
set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets
they have purchased. By installing, downloading, accessing or
otherwise using such software upgrades, customers agree to be bound
by the terms of Cisco's software license terms found at 
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
or as otherwise set forth at Cisco.com Downloads at 
http://www.cisco.com/public/sw-center/sw-usingswc.shtml

Do not contact psirt () cisco com or security-alert () cisco com for
software upgrades.

Customers with Service Contracts
+-------------------------------

Customers with contracts should obtain upgraded software through
their regular update channels. For most customers, this means that
upgrades should be obtained through the Software Center on Cisco's
worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations
+------------------------------------------------

Customers whose Cisco products are provided or maintained through
prior or existing agreements with third-party support organizations,
such as Cisco Partners, authorized resellers, or service providers
should contact that support organization for guidance and assistance
with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific
customer situations, such as product mix, network topology, traffic
behavior, and organizational mission. Due to the variety of affected
products and releases, customers should consult with their service
provider or support organization to ensure any applied workaround or
fix is the most appropriate for use in the intended network before it
is deployed.

Customers without Service Contracts
+----------------------------------

Customers who purchase direct from Cisco but do not hold a Cisco
service contract, and customers who purchase through third-party
vendors but are unsuccessful in obtaining fixed software through
their point of sale should acquire upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows.

  * +1 800 553 2447 (toll free from within North America)
  * +1 408 526 7209 (toll call from anywhere in the world)
  * e-mail: tac () cisco com

Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of entitlement to
a free upgrade. Free upgrades for non-contract customers must be
requested through the TAC.

Refer to 
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html 
for additional TAC contact information, including localized telephone 
numbers, and instructions and e-mail addresses for use in various 
languages.

Exploitation and Public Announcements
=====================================

The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory.

These vulnerabilities were discovered during internal testing.

Status of this Notice: FINAL
============================

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.

Distribution
============

This advisory is posted on Cisco's worldwide website at:

http://www.cisco.com/warp/public/707/cisco-sa-20100512-pgw.shtml

In addition to worldwide web posting, a text version of this notice
is clear-signed with the Cisco PSIRT PGP key and is posted to the
following e-mail and Usenet news recipients.

  * cust-security-announce () cisco com
  * first-bulletins () lists first org
  * bugtraq () securityfocus com
  * vulnwatch () vulnwatch org
  * cisco () spot colorado edu
  * cisco-nsp () puck nether net
  * full-disclosure () lists grok org uk
  * comp.dcom.sys.cisco () newsgate cisco com

Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the above URL for any updates.

Revision History
================

+---------------------------------------+
| Revision |             | Initial      |
| 1.0      | 2010-May-12 | public       |
|          |             | release.     |
+---------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at 
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
This includes instructions for press inquiries regarding Cisco 
security notices.

All Cisco security advisories are available at 
http://www.cisco.com/go/psirt
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