National Cyber-Alert System

Vulnerability Summary for CVE-2009-0635

Overview

Memory leak in the Cisco Tunneling Control Protocol (cTCP) encapsulation feature in Cisco IOS 12.4, when an Easy VPN (aka EZVPN) server is enabled, allows remote attackers to cause a denial of service (memory consumption and device crash) via a sequence of TCP packets.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

Solution

Per: http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml Obtaining Fixed Software Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment. Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml . }

References to Advisories, Solutions, and Tools

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External Source: CONFIRM

Name: http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml

Type: Advisory; Patch Information

Hyperlink:http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml

External Source: CISCO

Name: 20090325 Cisco IOS cTCP Denial of Service Vulnerability

Type: Advisory; Patch Information

Hyperlink:http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtml

External Source: XF

Name: ios-ctcp-dos(49417)

Hyperlink:http://xforce.iss.net/xforce/xfdb/49417

External Source: VUPEN

Name: ADV-2009-0851

Type: Advisory

Hyperlink:http://www.vupen.com/english/advisories/2009/0851

External Source: SECTRACK

Name: 1021895

Hyperlink:http://www.securitytracker.com/id?1021895

External Source: BID

Name: 34246

Hyperlink:http://www.securityfocus.com/bid/34246

External Source: SECUNIA

Name: 34438

Type: Advisory

Hyperlink:http://secunia.com/advisories/34438