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Vulnerability Note VU#530057

Cisco ASA fails to properly process DHCP relay packets

Overview

The Cisco Adaptive Security Appliance contains a memory exhaustion vulnerability that may occur when the DHCP service relay is enabled.

I. Description

The Cisco Adaptive Security Appliance (ASA) is firewall that includes routing and intrusion prevention system (IPS) features. DHCP relay allows network devices to forward DHCP broadcast packets from a network segment that does not have a DHCP server to one that does. The Cisco ASA supports DHCP relay.

The Cisco ASA DHCP relay service contains a memory exhaustion vulnerability. An attacker may trigger the vulnerability by sending a large number of DHCP requests to a vulnerable system.

II. Impact

An unauthenticated attacker may be able to create a denial-of-service condition.

III. Solution

Update

Cisco has released an update to address this issue. See Cisco BUG ID: CSCsh50277 for more details.

Increase DHCP lease times

Increasing the DHCP lease times may lengthen the amount of time required for an attacker to exhaust the available memory on a vulnerable system.

Systems Affected

VendorStatusDate NotifiedDate Updated
Cisco Systems, Inc.Vulnerable3-May-2007

References


http://www.cisco.com/en/US/products/ps6120/index.html
http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCsh50277
http://www.cisco.com/en/US/products/ps6120/products_configuration_guide_chapter09186a0080636f31.html
http://en.wikipedia.org/wiki/Intrusion-prevention_system
http://www.cisco.com/warp/public/707/cisco-sr-20070502-pix.shtml

Credit

This vulnerability was discovered by Lisa Sittler and Grant Deffenbaugh of CERT/CC.

This document was written by Ryan Giobbi.

Other Information

Date Public:2007-05-02
Date First Published:2007-05-02
Date Last Updated:2007-05-03
CERT Advisory: 
CVE-ID(s): 
NVD-ID(s): 
US-CERT Technical Alerts: 
Metric:0.64
Document Revision:27

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