Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Vulnerability Alert

Cisco Firewall Services Module and Cisco ASA 5500 Series Adaptive Security Appliance DCERPC Inspection Denial of Service Vulnerabilities

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:27108
Version:1
First Published:2012 October 10 16:07 GMT
Last Published:2012 October 10 16:07 GMT
Port: Not available
CVE:CVE-2012-4662 , CVE-2012-4663
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 Firewall Services Module and Cisco ASA 5500 Series Adaptive Security Appliance contain multiple vulnerabilities that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system. Updates are available.
 
 
Description
Cisco Firewall Services Module (FWSM) and Cisco ASA 5500 Series Adaptive Security Appliance (ASA) contain multiple vulnerabilities that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

These vulnerabilities are due to insufficient validation of user-supplied input processed by the affected software. An unauthenticated, remote attacker could exploit these vulnerabilities by sending crafted Distributed Computing Environment/Remote Procedure Call (DCERPC) packets to a vulnerable system. Processing these packets could cause a targeted device to reload, resulting in a DoS condition on the system.

Cisco has confirmed these vulnerabilities and released updated software.
 
Warning Indicators
The following releases of Cisco FWSM are vulnerable while running on Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers with the DCERPC inspection engine enabled:
  • Cisco FWSM Releases prior to 3.2(24)
  • Cisco FWSM Releases 4.0.17 and prior
  • Cisco FWSM Releases prior to 4.1(7)
The following releases of Cisco ASA Software are also affected by these vulnerabilities:
  • Cisco ASA Releases prior to 8.3(2.25)
  • Cisco ASA Releases prior to 8.4(2.4)
  • Cisco ASA Releases prior to 8.5(1.12)
 
IntelliShield Analysis
To exploit these vulnerabilities, an attacker would need access to an internal network to send crafted packets to a vulnerable device. In a typical network configuration, such devices are placed on trusted, internal networks. This access requirement could limit the possibility 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 security advisories for Cisco bug IDs CSCtr27524, CSCtr27521, CSCtr21376, and CSCtr21346 at the following links: cisco-sa-20121010-fwsm and cisco-sa-20121010-asa
 
Impact
An unauthenticated, remote attacker could exploit these vulnerabilities to cause an affected device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerabilities are due to insufficient validation of user-supplied input processed by the affected software. The DCERPC inspection engine of an affected device fails to validate DCERPC packets in a valid DCERPC session. These vulnerabilities can be triggered by IP version 4 and IP version 6 traffic. In addition, these vulnerabilities also affect both routed and transparent firewall modes in both single-context and multicontext modes.

An unauthenticated, remote attacker could exploit these vulnerabilities by sending crafted DCERPC packets to a vulnerable system for inspection. Processing these packets could cause a device to reload or possibly overflow the stack, which may allow the attacker to execute arbitrary commands.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators may consider disabling the DCERPC inspection engine if this option is not required.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit these vulnerabilities.

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:
CiscoCisco Adaptive Security Appliances Firmware (ASA) 8.3 .1, .1.1, .1.4, .1.6, .2, .2.4, .2.13, .2.23 | 8.4 Base, .1, .1.3, .1.11, .2, .2.8 | 8.5 Base, .1, .1.1, .1.6, .1.7
CiscoCisco Firewall Services Module (FWSM) 3.1 Base, .1, .1(2), .1(3), .1(4), .1(5), .1(6), .1(7), .2, .3, .3(1), .3(3), .3(11), .3(18), .4, .5, .6, .7, .8, .9, .10, .11, .12, .13, .14, .15, .16, .17, .18, .19, .20, .21 | 3.2 Base, .1, .2, .3, .4, .5, .6, .7, .8, .9, .10, .11, .12, .13, .14, .15, .16, .17, .18, .19, .20, .21, .22 | 4.0 .1, .2, .3, .6, .7, .8, .10, .11, .12, .13, .14, .15, .16, .17 | 4.1 Base, .1, .2, .3, .4, .5, .6

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.
Powered by  IntelliShield