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Last updated: 7/26/2014 7:05:43 AM

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NVD is a product of the NIST Computer Security Division and is sponsored by the Department of Homeland Security's National Cyber Security Division. It supports the U.S. government multi-agency (OSD, DHS, NSA, DISA, and NIST) Information Security Automation Program. It is the U.S. government content repository for the Security Content Automation Protocol (SCAP).

National Cyber Awareness System

Vulnerability Summary for CVE-2009-0635

Original release date: 03/27/2009
Last revised: 04/02/2009
Source: US-CERT/NIST

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 v2 Base Score: 7.1 (HIGH) (AV:N/AC:M/Au:N/C:N/I:N/A:C) (legend)
Impact Subscore: 6.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

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: SECUNIA
Name: 34438
Type: Advisory
External Source: XF
Name: ios-ctcp-dos(49417)
External Source: BID
Name: 34246
External Source: CISCO
Name: 20090325 Cisco IOS cTCP Denial of Service Vulnerability
Type: Advisory; Patch Information
External Source: VUPEN
Name: ADV-2009-0851
Type: Advisory
External Source: SECTRACK
Name: 1021895
External Source: CONFIRM
Name: http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml
Type: Advisory; Patch Information

Technical Details

Vulnerability Type (View All)
  • Resource Management Errors (CWE-399)