Vulnerability Alert

Cisco Secure Access Control System Malformed Packet Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:30642
Version:1
First Published:2013 September 04 19:56 GMT
Last Published:2013 September 04 19:56 GMT
Port: Not available
CVE:CVE-2013-5470
BugTraq ID:62145
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.4 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.3
 
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 available.
 
 
Description
A vulnerability in the TACACS+ socket read function of Cisco Secure ACS versions 5.x could allow an unauthenticated, remote attacker to cause a runtime process to crash.

The vulnerability is due to improper processing of read requests on the TACACS+ socket. An attacker could exploit this vulnerability by sending malformed TCP packets to an affected ACS server configured for TACACS+. An exploit could allow the attacker to cause a runtime process to crash, resulting in a denial of service (DoS) condition for TACACS+ requests.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco Secure ACS versions 5.4.0.46.3 and prior were vulnerable. Later releases of Cisco Secure ACS may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, the attacker would need to send malformed TCP packets to the targeted system. To achieve this objective, the attacker may need access to trusted, internal network resources. This access requirement reduces 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 notice at the following link: CVE-2013-5470

Customers are advised to consult Cisco bug ID CSCuh12488 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a runtime process to crash, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper processing of read requests on the TACACS+ socket used by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending malformed TCP packets to an affected ACS configured for TACACS+. If successful, the attacker could cause a runtime process on an affected system to crash, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.

Administrators are advised to monitor affected systems.
 
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 email 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 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




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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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