Vulnerability Alert

Cisco Unified Presence and Jabber Extensible Communications Platform Stream Header Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:26846
Version:1
First Published:2012 September 12 16:22 GMT
Last Published:2012 September 12 16:22 GMT
Port: Not available
CVE:CVE-2012-3935
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.1
 
Version Summary:Cisco Unified Presence and Jabber Extensible Communications Platform contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
Cisco Unified Presence and Jabber Extensible Communications Platform (Jabber XCP) contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted device.

The vulnerability is due to incorrect handling of Extensible Messaging and Presence Protocol (XMPP) stream headers. An attacker could exploit this vulnerability by sending a crafted XMPP stream header. An exploit could cause the Connection Manager processes to crash, resulting in dropped connections for existing clients and preventing new client connections. The Connection Manager processes will restart automatically. However, repeated exploitation could create a sustained DoS condition.

Cisco has confirmed the vulnerability and released updated software.
 
Warning Indicators
The following Cisco products are affected:
  • Cisco Unified Presence versions prior to 8.6(3)
  • Cisco Jabber XCP software versions prior to 5.3
 
IntelliShield Analysis
To exploit this vulnerability, the attacker may require access to trusted, internal networks. This access limitation could limit 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.

More information about XMPP stream headers is available in RFC 6120.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCtu32832 at the following link: cisco-sa-20120912-cupxcp
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted XMPP stream header to an affected server. Successful exploitation of this vulnerability could cause the Connection Manager process to crash. Repeated exploitation could result in a sustained DoS condition.
 
Technical Information
XMPP clients initiate communication with an XMPP server by sending a stream header using IP version 4 (IPv4) or IP version 6 (IPv6). The vulnerability is due to the incorrect handling of XMPP stream headers by the affected system.

An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted XMPP stream header to an affected system. When the affected software processes the malicious stream header, the attacker could cause the Connection Manager processes to terminate abnormally, resulting in dropped connections for existing clients and preventing new clients from connecting. The Connection Manager processes will restart automatically; however, repeated exploitation could create a sustained DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

Administrators are advised to monitor affected systems.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of the Cisco Unified Presence and Jabber Extensible Communications Platform Denial of Service Vulnerability
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Unified Presence Server (CUPS) 1.0 .1, .2, .3 | 6.0 Base, .1, .2, .3, .4, .5, .6, .7 | 7.0 Base, .1, .2, .3, .4, .5, .6, .7, .8 | 8.0 .1, .2 | 8.5 .1, .2, .3, .4, .5
CiscoCisco Jabber XCP 4.0 Base | 5.2 Base

Associated Products:
N/A




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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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