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Vulnerability Alert

Cisco IPS SensorApp Regex Processing Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:29105
Version:1
First Published:2013 April 29 20:28 GMT
Last Published:2013 April 29 20:28 GMT
Port: Not available
CVE:CVE-2013-1219
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.4 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.6
 
 
Version Summary:Cisco Intrusion Prevention System SensorApp contains a vulnerability that could allow a local attacker to cause a denial of service condition on a targeted device. Updates are available.
 
 
Description
Cisco Intrusion Prevention System (IPS) SensorApp contains a vulnerability that could allow a local attacker to cause a denial of service (DoS) condition.

The vulnerability is due to a job failure in the Regex hardware when processing the control transaction getENGVirtualSensorStatistics. A local attacker could exploit the vulnerability by performing an action that uses the getENGVirtualSensorStatistics control transaction. When the malicious action is processed by the affected device, the SensorApp process may hang or become unresponsive to legitimate commands or control transactions, leading to a DoS condition.

Cisco has confirmed the vulnerability in a security notice and has released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco IPS version 7.1 was vulnerable when running on the following devices:
  • IPS 4510
  • IPS 4520 SSP10, SSP20, SSP40, and SSP60
  • ASA 5525-X
  • ASA 5545-X
  • ASA 5555-X (with SSP running IPS)
  • IPS 4345
  • IPS 4360
Later versions of Cisco IPS Software may also be affected.
 
IntelliShield Analysis
This vulnerability is applicable only to platforms that implement Regex hardware.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.

To exploit this vulnerability, an attacker requires authenticated access to a targeted device and may require access to trusted, internal networks. These access requirements could limit the likelihood of a successful exploit.
 
Vendor Announcements
Cisco has released a security notice for bug ID CSCuc74630 at the following link: CVE-2013-1219
 
Impact
A local attacker could exploit the vulnerability to cause the SensorApp process to hang or become unresponsive to legitimate commands or control transactions, leading to a DoS condition.
 
Technical Information
The vulnerability is due to a job failure in the Regex hardware when processing the control transaction getENGVirtualSensorStatistics. A local attacker could exploit the vulnerability by executing any of the following actions:
  • Initiate signature upgrade
  • Initiate global correlation
  • Run show statistics anomaly-detection command
  • Run clear database command
When the malicious action is processed by the affected device, the SensorApp process may hang or become unresponsive to legitimate commands or control transactions, leading to a DoS condition.
 
Safeguards
Administrators may consider rebooting an affected device and disabling string-tcp or string-tcp-xl engines or disabling signatures associated with these engines.

Administrators are advised to migrate to signature pack S688 or higher if using any signature packs between S673 to S687.

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to access local systems.

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

Administrators are advised to allow only privileged users to access administration or management systems.

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.
 
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 Base

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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