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Vulnerability Alert

Cisco WebEx Recording Format Player Stack Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:30534
Version:1
First Published:2013 September 04 16:17 GMT
Last Published:2013 September 04 16:17 GMT
Port: Not available
CVE:CVE-2013-1118
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.3
Related Resources:
View related Security AdvisoryView related IPS Signature
 
 
Version Summary:Cisco WebEx Recording Format Player contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service condition.
 
 
Description
A vulnerability in the Cisco WebEx Recording Format (WRF) player used in Cisco WebEx Business Suite could allow an unauthenticated, remote attacker to crash the Cisco WebEx WRF player, and in some cases execute remote code with the privilege of the logged in user.

The vulnerability is due to a failure to properly validate input from the .wrf recording being played. An attacker could exploit this vulnerability by persuading a user to play a specially crafted .wrf recording in a vulnerable Cisco WebEx WRF player. This vulnerability cannot be triggered by just attending a WebEx meeting.

Cisco would like to thank the Microsoft Vulnerability Research (MSVR) team for reporting this vulnerability.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco WebEx WRF players running on Microsoft Windows, Apple Mac OS X, and Linux platforms with the following client builds are vulnerable:
  • Cisco WebEx Business Suite client builds prior to T28.8 (28.8)
  • Cisco WebEx Business Suite client builds prior to T27LDSP32EP16 (27.32.16)
 
IntelliShield Analysis
The vulnerability cannot be triggered by users attending a WebEx session. To exploit the vulnerability, an attacker must convince a user to play a malicious .wrf file. The attacker may provide a file to the user and persuade the user to open or execute the file by using misleading language or instructions.

Cisco indicates through the CVSS score that proof-of-concept code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCuc27645 at the following link: cisco-sa-20130904-webex
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system with the privileges of the user. If the user holds elevated privileges, a successful exploit could result in a complete compromise of the system. An attacker could also cause an affected application to crash, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper processing of .wrf files by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to open a crafted .wrf file with the affected application. Processing the malicious file may trigger a stack-based overflow condition that may allow the attacker to execute arbitrary code or cause the affected application to crash, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.

Users are advised not to open media files from suspicious or unrecognized sources. If users cannot verify that media files are safe, they are advised not to open them.

Administrators are advised to monitor critical systems.
 
Patches/Software
Cisco customers could receive automatic updates after a recording file that is hosted on a WebEx server is accessed. In addition, customers that installed the Cisco WebEx WRF Player manually could perform a manual install of a new version of the WebEx WRF Player at the following link: WebEx
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco WebEx WRF Player T26 SP49 Base, EP1, EP2, EP3, EP4, EP5, EP6, EP7, EP8, EP9, EP10, EP11, EP12, EP13, EP14, EP15, EP16, EP17, EP18, EP19, EP20, EP21, EP22, EP23, EP24, EP25, EP26, EP27, EP28, EP29, EP30, EP31, EP32, EP33, EP34, EP35, EP36, EP37, EP38, EP39 | T27 SP10 Base | T27 SP11 Base, EP1, EP2, EP3, EP4, EP5, EP6, EP7, EP8, EP9, EP10, EP11, EP12, EP13, EP14, EP15, EP16, EP17, EP18, EP19, EP20, EP21, EP22, EP23, EP24, EP25, EP26 | T27 SP12 Base | T27 SP13 Base | T27 SP21 Base, EP1, EP2, EP3, EP4, EP5, EP6, EP7, EP8, EP9, EP10 | T27 SP25 Base, EP1, EP2, EP3, EP4, EP5, EP6, EP7, EP8, EP9, EP10 | T27 SP28 Base | T27 SP32 Base, CP1 | T28 Base | T28 SP1 Base

Associated Products:
N/A




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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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