Vulnerability Alert

Cisco Unified Communications Manager UDP Closed Ports Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:28328
Version:1
First Published:2013 February 27 16:14 GMT
Last Published:2013 February 27 16:14 GMT
Port: Not available
CVE:CVE-2013-1133
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 Communications Manager contains a vulnerability which could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device.
 
 
Description
Cisco Unified Communications Manager contains a vulnerability which could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted device.

The vulnerability is due to improper handling of crafted UDP packets addressed to closed ports on a targeted device. An attacker could exploit vulnerability by sending multiple, crafted UDP packets to closed ports on a targeted device. A successful exploit could allow the attacker to cause the graphical user interface (GUI) to become unresponsive to legitimate users, while also causing an interruption of voice services.
 
Warning Indicators
Cisco Unified Communications Manager versions prior to 9.0(1), 8.6(4) BE3k and 8.6(2a)su2 are vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker would need access to trusted, internal networks to submit malicious requests to the targeted system. This access requirement decreases 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.

Cisco Unified Communications Manager 7.1(x) and 8.5(x) versions are not affected.
 
Vendor Announcements
Cisco has released a security advisory for bug ID CSCtx43337 at the following link: cisco-sa-20130227-cucm
 
Impact
An attacker could exploit this vulnerability by sending multiple, crafted UDP packets to closed ports on a targeted device. A successful exploit could allow the attacker to cause the GUI to become unresponsive to legitimate users and cause an interruption of voice services.
 
Technical Information
The vulnerability is due to improper handling of crafted UDP packets addressed to closed ports on a targeted device.

An attacker could exploit vulnerability by sending multiple, crafted UDP packets to closed ports on a targeted device. When the malicious packets are processed by the device, CPU resources may be exhausted. A successful exploit could allow the attacker to cause the GUI to become unresponsive to legitimate users and an interruption of voice services.
 
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 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 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 e-mail 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 Unified Communications Manager 8.6 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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