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Vulnerability Alert

Cisco IPS Analysis Engine Denial of Service Vulnerability

 
Threat Type:CWE: Insufficient Information
IntelliShield ID:32838
Version:1
First Published:2014 February 19 16:32 GMT
Last Published:2014 February 19 16:32 GMT
Port: Not available
CVE:CVE-2014-0718
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary:Cisco Intrusion Prevention System Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system. Updates are available.
 
 
Description
A vulnerability in the produce-verbose-alert code of Cisco Intrusion Prevention System (IPS) Software could allow an unauthenticated, remote attacker to cause the Analysis Engine process to become unresponsive.

The vulnerability is due to improper handling of fragmented packets by the Analysis Engine process when the produce-verbose-alert action is enabled. An attacker could exploit this vulnerability by sending fragmented packets through the affected system. To trigger the vulnerability, the attacker could cause a signature with the produce-verbose-alert action to fire, or trigger an event for which produce-verbose-alert has been configured as an event action override. An exploit could allow the attacker to cause the Analysis Engine process to become unresponsive. This will cause the affected system to stop inspecting traffic.

Cisco has confirmed the vulnerability in a security advisory and has released software updates.
 
Warning Indicators
Cisco IPS Software versions 7.1, 7.2, and 7.3 are affected.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could limit 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 bug ID CSCui91266 at the following link: cisco-sa-20140219-ips
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability the affected system to stop inspecting traffic.
 
Technical Information
The vulnerability is due to improper handling of fragmented packets by the Analysis Engine process when the produce-verbose-alert action is enabled.

An unauthenticated, remote attacker could exploit this vulnerability by sending fragmented packets through the affected system, which could cause a signature with the produce-verbose-alert action to execute or trigger an event for which produce-verbose-alert has been configured as an event action override. When the malicious traffic is processed by the affected software, the Analysis Engine process may become unresponsive. This will cause the affected system to stop inspecting traffic.
 
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.

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: Mitigation and Identification of Multiple Vulnerabilities in Cisco IPS Software
 
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:
CiscoIntrusion Prevention System (IPS) 7.1 (4)E4, (5)E4, (6)E4, (7)E4, (8)E4 | 7.2 (1)E4

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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