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Vulnerability Alert

Cisco Firewall Services Module and Cisco ASA 5500 Series Adaptive Security Appliance DCERPC Inspection Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:27107
Version:1
First Published:2012 October 10 16:08 GMT
Last Published:2012 October 10 16:08 GMT
Port: Not available
CVE:CVE-2012-4661
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:9.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.4
 
Version Summary:Cisco Firewall Services Module and Cisco ASA 5500 Series Adaptive Security Appliance contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands or cause a denial of service condition. Updates are available.
 
 
Description
Cisco Firewall Services Module (FWSM) and Cisco ASA 5500 Series Adaptive Security Appliance (ASA) contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands or cause a denial of service (DoS) condition.

The vulnerability is due to insufficient validation of user-supplied input processed by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted Distributed Computing Environment/Remote Procedure Call (DCERPC) packets to a vulnerable system. Processing these packets could cause a stack overflow or cause a targeted device to reload, resulting in a DoS condition or allowing the attacker to execute arbitrary commands on the system.

Cisco has confirmed this vulnerability and released updated software.
 
Warning Indicators
The following releases of Cisco FWSM are vulnerable when 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(9)
The following releases of Cisco ASA Software are also affected by this vulnerability:
  • Cisco ASA Releases prior to 8.3(2.34)
  • Cisco ASA Releases prior to 8.4(4.4)
  • Cisco ASA Releases prior to 8.5(1.12)
  • Cisco ASA Releases prior to 8.6(1.3)
 
IntelliShield Analysis
To exploit this vulnerability, 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.

A successful exploit could allow an attacker to execute arbitrary commands, which could lead to privilege escalation that could result in a complete system comprise.

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 CSCtr27522 and CSCtr21359 at the following links: cisco-sa-20121010-fwsm and cisco-sa-20121010-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a stack overflow condition which could be leveraged to execute arbitrary commands or cause an affected device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerability is 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. The vulnerability can be triggered by IP version 4 and IP version 6 traffic.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted DCERPC packets to a vulnerable system for inspection. Processing these packets could cause a targeted 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 this vulnerability.

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, .2.25, .2.31, .2.33 | 8.4 Base, .1, .1.3, .1.11, .2, .2.8, .3, .3.8, .3.9, .4, .4.1, .4.3 | 8.5 Base, .1, .1.1, .1.6, .1.7 | 8.6 Base, .1, .1.1, .1.2
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




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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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