Vulnerability Alert

Cisco Jabber for Windows Certificate Validation Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:30666
Version:1
First Published:2013 September 05 16:00 GMT
Last Published:2013 September 05 16:00 GMT
Port: Not available
CVE:CVE-2013-1228
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.4
 
Version Summary:Cisco Jabber for Windows contains a vulnerability that could allow an unauthenticated, remote attacker to conduct man-in-the-middle attacks. Updates are available.
 
 
Description
A vulnerability in Cisco Jabber for Windows could allow an unauthenticated, remote attacker to gain a man-in-the-middle position.

The vulnerability is due to a failure to validate server certificates when negotiating a connection over Secure Sockets Layer (SSL). An attacker could exploit this vulnerability by intercepting and altering the connection.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco Jabber for Windows versions 9.2.1 and prior were vulnerable. Later releases of Cisco Jabber for Windows may also be vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may need access trusted, internal networks to convince a targeted user to accept a crafted certificate. This access requirement could reduce the likelihood of a successful exploit.

Cisco indicates through the CVSS score that proof-of-concept exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2013-1228

Customers are advised to consult Cisco bug ID CSCug30280 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to gain a man-in-the-middle position between communicating devices. Successful exploitation could allow an attacker to intercept traffic or alter the connection between these devices, which could be used to conduct further attacks.
 
Technical Information
The vulnerability is due to insufficient validation of server certificates when the affected software establishes an SSL connection.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to accept a crafted certificate while establishing an SSL connection to the server. Successful exploitation could allow an attacker to intercept traffic or alter the connection between the communicating devices, which could be used to conduct further attacks.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Jabber for Windows 9.0 Base, .1, .2, .3, .4, .5 | 9.1 .0, .1, .2, .3, .4, .5 | 9.2 .0, .1

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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