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Cisco Security Notice

Cisco IPS MainApp SNMP Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-2103
CVE ID: CVE-2014-2103
Release Date: 2014 February 27 17:16  UTC (GMT)
Last Updated: 2014 March 3 20:58  UTC (GMT)

Related Resources:

View related Alert


Summary

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.

Affected Products

ProductMore InformationCVSS
Intrusion Prevention System (IPS)CSCum52355, CSCul493096.8/6.1

What Is a Cisco Security Notice?

The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco Security Notices to inform customers of low- to mid-level severity security issues involving Cisco products.

Customers who wish to upgrade to a software version that includes fixes for these issues should contact their normal support channels. Free software updates will not be provided for issues that are disclosed through a Cisco Security Notice.

For additional information about Cisco PSIRT publications, see the Cisco Security Vulnerability Policy at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html

Customers Using Third-Party Support Organizations

Customers may have Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers. For these products, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Disclaimer

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