Vulnerability Alert

Cisco Unified Presence Server Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:28330
Version:1
First Published:2013 February 27 16:09 GMT
Last Published:2013 February 27 16:09 GMT
Port: Not available
CVE:CVE-2013-1137
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:Cisco Unified Presence Server contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
Cisco Unified Presence Server contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to the improper processing of crafted packets by the affected system. An unauthenticated, remote attacker could exploit this vulnerability by sending a series of crafted packets via Session Initiation Protocol (SIP) TCP port 5060 to the targeted device. Processing the crafted packets could cause an increase in CPU utilization on the system that could lead to a disruption of services, resulting in a DoS condition.

Cisco has confirmed this vulnerability and software updates are available.
 
Warning Indicators
Cisco Unified Presence Server versions 8.6, 9.0, and 9.1 are vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, an attacker would likely need access to an internal, trusted network to send crafted packets to the targeted system, decreasing the likelihood of a successful exploit.

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 ID CSCua89930 at the following link: cisco-sa-20130227-cups
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause high CPU utilization on an affected device, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to the improper processing of crafted packets by the affected system.

An unauthenticated, remote attacker could exploit this vulnerability by sending a series of crafted packets via TCP port 5060 to a targeted device. Processing the crafted packets could cause an increase in CPU utilization on the system that could lead to a disruption of services, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators may consider using a solid firewall strategy to filter traffic from untrusted sources on TCP port 5060.

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.

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: Identification and Mitigation of Vulnerabilities in Cisco Voice and Unified Communications Products
 
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 for assistance.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
6009/0SYN Flood DOSS5932011 Sep 07 
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Unified Presence Server 8.6 .4
CiscoCisco Unified Communications Manager IM and Presence Service 9.0 (1) | 9.1 (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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