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Vulnerability Alert

Cisco Secure Access Control System Distributed Deployment Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:31435
Version:1
First Published:2013 October 23 16:31 GMT
Last Published:2013 October 23 16:31 GMT
Port: Not available
CVE:CVE-2013-5536
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.8
Related Resources:
View related Security Notice
 
 
Version Summary:Cisco Secure Access Control System contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are not available.
 
 
Description
A vulnerability in the firewall modules of Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to cause certain internal processes to crash.

The vulnerability is due to improper implementation of the firewall rule to limit incoming packets. An attacker could exploit this vulnerability by flooding the affected service with crafted packets. An exploit could allow the attacker to render some processes nonoperational, resulting in a denial of service (DoS) condition.

Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
 
Warning Indicators
At the time this alert was first published, Cisco ACS versions 5.4.0.46.3 and prior were vulnerable. Later releases of Cisco ACS may also be vulnerable.
 
IntelliShield Analysis
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 notice at the following link: CVE-2013-5536

Customers are advised to consult Cisco bug ID CSCui51521 for a complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause certain internal processes to crash, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper implementation of the firewall rule to limit incoming packets.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted packets to a targeted device. An exploit could allow the attacker to render some processes nonoperational, resulting in a DoS condition.
 
Safeguards
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 allow only trusted users to have network access.

Administrators are advised to monitor affected systems.
 
Patches/Software
Software updates are not available.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Secure Access Control System (ACS) 5.0 Base, .0.21 | 5.1 Base, .0.44 | 5.2 Base, .0.26, .0.26.1, .0.26.2, .0.26.3, .0.26.4, .0.26.5, .0.26.6, .0.26.7, .0.26.8, .0.26.9, .0.26.10, .0.26.11 | 5.3 Base, .0.6, .0.40, .0.40.1, .0.40.2, .0.40.3, .0.40.4, .0.40.5, .0.40.6, .0.40.7 | 5.4 Base, .0.46.1, .0.46.2, .0.46.3

Associated Products:
N/A




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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