Message-id: <200912161155.webex@psirt.cisco.com>
Date: Wed, 16 Dec 2009 11:55:47 -0500
From: Cisco Systems Product Security Incident Response Team <psirt@...co.com>
To: bugtraq@...urityfocus.com
Cc: psirt@...co.com
Subject: Cisco Security Advisory: Multiple Cisco WebEx WRF Player Vulnerabilities

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Cisco Security Advisory: Multiple Cisco WebEx WRF Player Vulnerabilities

Advisory ID: cisco-sa-20091216-webex

http://www.cisco.com/warp/public/707/cisco-sa-20091216-webex.shtml

Revision 1.0

For Public Release 2009 December 16 1600 UTC (GMT)

Summary
=======

Multiple buffer overflow vulnerabilities exist in the Cisco WebEx
Recording Format (WRF) Player. In some cases, exploitation of the
vulnerabilities could allow a remote attacker to execute arbitrary code
on the system of a targeted user.

The Cisco WebEx WRF Player is an application that is used to play back
WebEx meeting recordings that have been recorded on the computer of an
on-line meeting attendee. The WRF Player can be automatically installed
when the user accesses a WRF file that is hosted on a WebEx server. The
WRF Player can also be manually installed for offline playback after
downloading the application from www.webex.com.

If the WRF Player was automatically installed, the WebEx WRF Player
will be automatically upgraded to the latest, non-vulnerable version
when users access a WRF file hosted on a WebEx server. If the WebEx
WRF Player was manually installed, users will need to manually install
a new version of the player after downloading the latest version from
www.webex.com.

Cisco has released free software updates that address these
vulnerabilities.

This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20091216-webex.shtml.

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

Vulnerable Products
- -------------------

The vulnerabilities disclosed in this advisory affect the Cisco WebEx
WRF Player. Microsoft Windows, Apple Mac OS X, and Linux versions of the
player are affected. Affected versions of the WRF Player are those prior
to the "first fixed" versions, which are shown in the section "Software
Versions and Fixes" of this advisory.

To check if a Cisco WebEx server is running an affected version of the
WebEx client build, users can log in to their Cisco WebEx server and go
to the Support -> Downloads section. The version of the WebEx client
build will be displayed on the right-hand side of the page under "About
Support Center", for example "Client build: 27.11.0.3328".

There is no way to check if a manually installed version of the WRF
Player is affected by these vulnerabilities. Therefore, Cisco recommends
that users upgrade to the most current version of the player that is
available from http://www.webex.com/downloadplayer.html.

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

The Cisco WebEx Player for the WebEx Advanced Recording Format (ARF)
file format is not affected by these vulnerabilities.

No other Cisco products are currently known to be affected by these
vulnerabilities.

Details
=======

The WebEx meeting service is a hosted multimedia conferencing solution
that is managed by and maintained by Cisco WebEx. The WebEx Recording
Format (WRF) is a file format that is used to store WebEx meeting
recordings that have been recorded on the computer of an on-line meeting
attendee. The WRF Player is an application that is used to play back
and edit WRF files (files with .wrf extensions). The WRF Player can be
automatically installed when the user accesses a WRF file that is hosted
on a WebEx server (stream playback mode). The WRF Player can also be
manually installed after downloading the application from www.webex.com
to play back WRF files locally (offline playback mode).

Multiple buffer overflow vulnerabilities exist in the WRF Player. The
vulnerabilities may lead to a crash of the WRF Player application, or in
some cases, lead to remote code execution.

To exploit a vulnerability, a malicious WRF file would need to be opened
by the WRF Player application. An attacker may be able to accomplish
this by providing the malicious WRF file directly to users (for example,
via e-mail), or by convincing users to visit a malicious website. The
vulnerability cannot be triggered by users attending a WebEx meeting.

These vulnerabilities have been assigned the following Common
Vulnerabilities and Exposures (CVE) identifiers:

  * CVE-2009-2875
  * CVE-2009-2876
  * CVE-2009-2877
  * CVE-2009-2878
  * CVE-2009-2879
  * CVE-2009-2880

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

* Multiple Cisco WebEx Player Buffer Overflow Vulnerabilities (all
vulnerabilities in this advisory)

CVSS Base Score - 9.3
    Access Vector -            Network
    Access Complexity -        Medium
    Authentication -           None
    Confidentiality Impact -   Complete
    Integrity Impact -         Complete
    Availability Impact -      Complete

CVSS Temporal Score - 7.7
    Exploitability -           Functional
    Remediation Level -        Official-Fix
    Report Confidence -        Confirmed

Impact
======

Successful exploitation of the vulnerabilities described in this
document could result in a crash of the Cisco WebEx WRF Player
application, and in some cases, allow a remote attacker to execute
arbitrary code on the targeted system with the privileges of the user
running the WRF Player application.

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

The table below contains "First Fixed" information for the Cisco WebEx
WRF Player that is automatically downloaded from a WebEx site when a WRF
hosted on a WebEx site is accessed (stream playback mode). Fixes are
cumulative within a major release so for example, if release 27.10.1 is
fixed, then release 27.10.2 will have the fix too.

+------------------------------------------------------------+
| Platform  | Major Release 26.x  | Major Release 27.x       |
|-----------+---------------------+--------------------------|
| Microsoft | 26.49.32; available | 27.10.x; available now   |
| Windows   | now except lockdown | for non-PSO and          |
|           | sites               | non-lockdown sites       |
|-----------+---------------------+--------------------------|
|           | 26.49.35; available | 27.11.8; available now   |
| Mac OS X  | early February 2010 | for non-PSO and          |
|           |                     | non-lockdown sites       |
|-----------+---------------------+--------------------------|
|           | 26.49.35; available | 27.11.8; available now   |
| Linux     | early February 2010 | for non-PSO and          |
|           |                     | non-lockdown sites       |
+------------------------------------------------------------+

PSO and lockdown sites running 27.x will receive the fixes for these
vulnerabilities during the next emergency patching (EP) cycle. This
advisory will be updated to indicate a specific timeline once one is
available.

If the WRF Player was automatically installed, the WebEx WRF Player will
be automatically upgraded to the latest, non-vulnerable version when
users access a WRF file hosted on a WebEx server.

If the WebEx WRF Player was manually installed, users will need to
manually install a new version of the player after downloading the
latest version from www.webex.com.

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

There are no workarounds for the vulnerabilities disclosed in this
advisory.

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@...co.com or security-alert@...co.com for software
upgrades.

Customers that need additional information can contact WebEx Global
Support Services and Technical Support. WebEx Global Support Services
and Technical Support can be reached through the WebEx support site at
http://support.webex.com/support/support-overview.html or by phone at
+1-866-229-3239 or +1-408-435-7088.

Customers outside of the United States can reference the following link
for local support numbers:

http://support.webex.com/support/phone-numbers.html

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

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

These vulnerabilities were discovered and reported to Cisco by Xiaopeng
Zhang and Zhenhua Liu of Fortinet's FortiGuard Labs. The FortiGuard Labs
advisory is available at http://www.fortiguard.com. Cisco would like to
thank FortiGuard Labs for reporting these vulnerabilities to us and for
working with us on a coordinated disclosure.

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-20091216-webex.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@...co.com
  * first-bulletins@...ts.first.org
  * bugtraq@...urityfocus.com
  * vulnwatch@...nwatch.org
  * cisco@...t.colorado.edu
  * cisco-nsp@...k.nether.net
  * full-disclosure@...ts.grok.org.uk
  * comp.dcom.sys.cisco@...sgate.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 1.0 | 2009-December-16  | Initial 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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Copyright 2008-2009 Cisco Systems, Inc. All rights reserved.
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Updated: Dec 16, 2009                             Document ID: 110946
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