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Vulnerability Alert

Cisco WebEx Recording Format Player Multiple Buffer Overflow Vulnerabilities

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:27109
Version:2
First Published:2012 October 10 16:26 GMT
Last Published:2012 October 15 20:23 GMT
Port: Not available
CVE:CVE-2012-3936 , CVE-2012-3937 , CVE-2012-3938 , CVE-2012-3939 , CVE-2012-3940 , CVE-2012-3941
BugTraq ID:55866
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
Related Resources:
View related Security AdvisoryView related IPS Signature
 
 
Version Summary:Additional technical information to describe the Cisco WebEx Recording Format player multiple buffer overflow vulnerabilities is available.
 
 
Description
Cisco WebEx Recording Format (WRF) player contains multiple buffer overflow vulnerabilities that could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition on a targeted system.

The vulnerabilities are due to multiple buffer overflows in the Cisco WRF player. An unauthenticated, remote attacker could exploit these vulnerabilities by convincing a user to view a malicious WRF file. If successful, the attacker could cause the application to crash, resulting in a DoS condition. In some cases, the attacker could execute arbitrary code on a system with the privileges of the targeted user, which may result in a complete system compromise if the user holds elevated privileges.

Cisco has confirmed these vulnerabilities in a security advisory and released updated software.
 
Warning Indicators
Cisco WRF player builds prior to T28.4 and prior to T27 LD SP32 EP 10 are vulnerable and may be distributed from the following platforms:
  • Cisco WebEx Event Center
  • Cisco WebEx Meeting Center
  • Cisco WebEx Sales Center
  • Cisco WebEx Support Center
  • Cisco WebEx Training Center
 
IntelliShield Analysis
To exploit these vulnerabilities, an attacker would need to convince a user with the affected application installed to open a malicious WRF file. An attacker may provide a file to the user and persuade the user to open or execute the file by using misleading language or instructions.

These vulnerabilities cannot be triggered by users who are attending a WebEx meeting.

Client builds prior to T27 SP32 of the Cisco WebEx Player have reached end of support. Customers are advised to upgrade to the latest versions of the Cisco WebEx Player as described in the Software Versions and Fixes section of this alert.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug IDs CSCua40962, CSCtz72967, CSCtz73583, CSCua61331, CSCtz72958, and CSCtz72850 at the following link: cisco-sa-20121010-webex
 
Impact
An unauthenticated, remote attacker could exploit these vulnerabilities to execute arbitrary code on a targeted system with the privileges of the user who is running the application. If the user holds elevated privileges, successful code execution could result in a complete compromise of the system. Successful exploitation could also cause the affected application to crash, resulting in a DoS condition.
 
Technical Information
The vulnerabilities are in the memcpy() function used by the atas32.dll while handling certain WRF files. The Cisco WRF player is used to play back WebEx meetings that have been recorded on a computer of an online meeting attendee.

An unauthenticated, remote attacker could exploit these vulnerabilities by convincing a targeted user to open a malicious WRF file designed to submit malicious input to the memcpy() function. Processing the file could write arbitrary values to memory areas used by the application, corrupting memory contents. The attacker could use the memory corruption condition to execute arbitrary code on the targeted system with the privileges of the targeted user.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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.

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

Administrators are advised to monitor critical systems.
 
Patches/Software
Cisco recommends that users upgrade to the current version of the WebEx player, which is available at the following link: WebEx

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
1451/0Cisco WebEx Player Player Heap Buffer Overflow VulnerabilityS6742012 Oct 10 
1475/0Webex Player Heap OverflowS6742012 Oct 10 
1487/0Cisco WebEx Recording Format Player Buffer OverflowS6742012 Oct 10 
1494/0Cisco WebEx Recording Format Player OverflowS6742012 Oct 10 
1497/0Cisco WebEx WRF Player Memory CorruptionS6742012 Oct 10 
1497/1Cisco WebEx WRF Player Memory CorruptionS6742012 Oct 10 
1504/0Cisco WebEx WRF Player Memory CorruptionS6742012 Oct 10 
1504/1Cisco WebEx WRF Player Memory CorruptionS6742012 Oct 10 
 
Alert History
 

Version 1, October 10, 2012, 12:26 PM: Cisco WebEx Recording Format player contains multiple buffer overflow vulnerabilities that could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service condition on a targeted system. Updates are available.



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:
CiscoCisco WebEx Event Center Original Release Base
CiscoCisco WebEx Meeting Center Original Release Base
CiscoCisco WebEx Sales Center Original Release Base
CiscoCisco WebEx Support Center Original Release Base
CiscoCisco WebEx Training Center Original Release Base




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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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