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AUSCERT External Security Bulletin Redistribution
Cisco IPS MainApp SNMP Denial of Service Vulnerability
3 March 2014
AusCERT Security Bulletin Summary
Product: Cisco IPS
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2014-2103
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Cisco Security Notice
Cisco IPS MainApp SNMP Denial of Service Vulnerability
CVE ID: CVE-2014-2103
Release Date: 2014 February 27 17:16 UTC (GMT)
Last Updated: 2014 February 27 17:16 UTC (GMT)
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 SNMP v3 user is configured
with the noAuth option, the attacker could perform the attack without
providing valid credentials. Cisco does not recommend configuring 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.
Product More Information CVSS
Intrusion Prevention System (IPS) CSCum52355, CSCul49309 6.8/6.1
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
For additional information about Cisco PSIRT publications, see the Cisco
Security Vulnerability Policy at
Customers Using Third-Party Support Organizations
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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.
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