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Vulnerability Alert

Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:31562
Version:1
First Published:2013 November 06 16:48 GMT
Last Published:2013 November 06 16:48 GMT
Port: Not available
CVE:CVE-2013-5553
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 IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in session initiation protocol functionality of Cisco IOS Software could allow an unauthenticated, remote attacker to trigger a memory leak or a device reload.

The vulnerability is due to incorrect processing of specially crafted SIP messages. An attacker could exploit this vulnerability by sending specific valid SIP messages to the SIP gateway.  An exploit could allow the attacker to trigger a memory leak or a device reload.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco IOS Software Releases 15.1(4)GC, 15.1(4)GC1, 15.1(4)M4, 15.1(4)M5, and 15.1(4)M6 are affected.
 
IntelliShield Analysis
Only specific releases of Cisco IOS Software configured to perform SIP message processing are affected. This configuration requirement greatly reduces the number of vulnerable systems.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug IDs CSCuc42558 and CSCug25383 at the following link: cisco-sa-20131106-sip
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a vulnerable device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper processing of Session Initiation Protocol (SIP) messages by Cisco IOS Software.

An unauthenticated, remote attacker could exploit the vulnerability by sending malicious SIP messages to the targeted system. The processing of the malicious messages could cause the device to consume available memory resources or reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

Administrators are advised to monitor affected systems.
 
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 email at tac@cisco.com.
 
Alert History
 
Initial Release


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

Primary Products:
N/A

Associated Products:
CiscoIOS 15.1GC 15.1(4)GC, 15.1(4)GC1 | 15.1M 15.1(4)M4, 15.1(4)M5, 15.1(4)M6 | 15.1XB 15.1(4)XB8, 15.1(4)XB8a




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


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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