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Vulnerability Alert

Cisco IPS MainApp SNMP Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:33109
Version:1
First Published:2014 March 03 20:58 GMT
Last Published:2014 March 03 20:58 GMT
Port: Not available
CVE:CVE-2014-2103
BugTraq ID:65864
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.1
 
Version Summary:Cisco Intrusion Prevention System Software 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 SNMP code of Cisco Intrusion Prevention System (IPS) Software could allow an unauthenticated, remote attacker to cause the MainApp process to become unresponsive. This creates a denial of service (DoS) condition because the Cisco IPS sensor is not able to execute several critical tasks including alert notification, event store management, and sensor authentication. The Cisco IPS web server will also be unavailable while the MainApp process is unresponsive. Additionally, due to this general system failure, other processes such as the Analysis Engine may not function properly.

The vulnerability is due to improper handling of malformed SNMP packets. An attacker may exploit this vulnerability by sending malformed SNMP packets to the management interface of the affected system. The vulnerability can be triggered by SNMP version 1 (v1), v2, and v3. If the SNMP v3 user is configured with the noAuth option, the attacker could perform the attack without providing valid credentials. Cisco does not recommend configuring the SNMP v3 user with the noAuth option.

Traffic passing through the sensing interfaces will not trigger this vulnerability. If the Cisco IPS is configured in promiscuous mode, mitigation actions that require MainApp processing, such as shun or rate-limit, may be unavailable. If the Cisco IPS is configured in inline mode, the sensor may not correctly perform inspection and mitigation actions because the Analysis Engine process may not be functioning properly.

Cisco has confirmed the vulnerability in a security notice and software updates are available.
 
Warning Indicators
At the time this alert was first published, Cisco IPS Software versions 7.2(1)(E4) and prior were vulnerable. Later releases of Cisco IPS Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send malformed SNMP packets to the management interface of an affected device. This access requirement may reduce the possibility of a successful exploit.

Cisco indicates that software updates are available for bug ID CSCul49309; however, updates are not available for bug ID CSCum52355.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2014-2103

Customers are advised to consult Cisco bug IDs CSCum52355 and CSCul49309 for a complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause the MainApp process on an affected device to become unresponsive, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper handling of malformed SNMP packets by an affected device.

An attacker may exploit this vulnerability by sending malformed SNMP packets to the management interface of the affected system. If successful, the attacker could cause the MainApp process running on the targeted device to become unresponsive, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators may consider disabling the SNMP server on affected devices.

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

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:
CiscoIntrusion Prevention System (IPS) 7.0 Base, (1)E3, (2)E3, (2)E4, (4)E4, (6)E4, (7)E4, (8)E4, (9)E4 | 7.1 Base, (1)E4, (2)E4, (3)E4, (4)E4, (5)E4, (6)E4, (7)E4, (8)E4 | 7.2 (1)E4

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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