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Cisco Security Advisory

SSL Certificate Validation Vulnerability in IDS Management Software

Advisory ID: cisco-sa-20050824-idsmc

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20050824-idsmc

Revision 1.1

For Public Release 2005 August 24 15:00  UTC (GMT)


Summary

CiscoWorks Management Center for IDS Sensors (IDSMC) is a network security software agent that provides configuration and signature management for Cisco Intrusion Detection and Intrusion Prevention systems.

A separate but closely related product, Monitoring Center for Security (Security Monitor or Secmon), provides event collection, viewing, and reporting capability for network devices.

A malicious attacker may be able to spoof a Cisco Intrusion Detection Sensor (IDS), or Cisco Intrusion Prevention System (IPS) by exploiting a vulnerability in the SSL certificate checking functionality in IDSMC and Secmon.

Cisco has made free software available to address this vulnerability.

This advisory is available at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20050824-idsmc.

Affected Products

This section provides details on affected products.

Vulnerable Products

These products are vulnerable:

  • IDSMC version 2.0 and version 2.1.
  • CiscoWorks Monitoring Center for Security (Security Monitor or Secmon) version 1.1 through version 2.0 and version 2.1.

Products Confirmed Not Vulnerable

These products are not vulnerable:

  • IDSMC versions 1.0 thru 1.2
  • CiscoWorks Monitoring Center for Security (Security Monitor or Secmon) version 1.0

No other Cisco products are currently known to be affected by vulnerability.

Details

A malicious attacker may be able to spoof an IDS or IPS by exploiting a vulnerability in the SSL certificate checking functionality in IDSMC and Secmon.

SSL certificates are used to secure and authenticate IDS and IPS sensors, thereby ensuring safe communication across your network.

This vulnerability is documented in the Cisco Bug Toolkit as Bug ID CSCsa50100 ( registered customers only) and CSCsb57379 ( registered customers only)

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss .


Impact

If exploited, the attacker may be able to gather login credentials, submit false data to IDSMC and Secmon or filter legitimate data from IDSMC and Secmon, thus impacting the integrity of the device and the reporting capabilities of it.

Software Versions and Fixes

This issue is addressed in Service Pack 1 for IPSMC 2.1 and Security Monitor 2.1. This service pack is available for download at http://www.cisco.com/pcgi-bin/tablebuild.pl/mgmt-ctr-ids-app

This service pack provides monitoring of certificate information and provides logged messages when the certificate changes for any reason for both IDSMC and Secmon.

In addition to logging certificate changes, this service pack allows Secmon to optionally drop the connection should the certificate change.

Revision 2.2 of IPSMC will provide the option to drop the connection between the sensor and IPSMC should the certificate change. This release is anticipated to be available in late 2005.


Workarounds

As a security best practice, you should always configure your IPS device with a list of trusted hosts or networks that you want to have access to the IPS sensor.

For more information on setting up IPS access lists so that only trusted hosted and networks may access the sensor, please see http://www.cisco.com/en/US/products/sw/secursw/ps2113/products_configuration_guide_chapter09186a008045a77c.html#wp1031536

Obtaining Fixed Software

Cisco has made free software available to address this vulnerability for affected customers. 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/public/sw-license-agreement.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers Using Third-Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for assistance with the upgrade, which should be free of charge.

Customers Without Service Contracts

Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

Please have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades.

See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.

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/public/sw-license-agreement.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

Cisco would like to thank Jan Bervar at NIL Data Communications for bringing this to our attention.

Status of This Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory will be posted on Cisco's worldwide website at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20050824-idsmc

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-teams@first.org (includes CERT/CC)
  • bugtraq@securityfocus.com
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.


Revision History

Revision 1.1

2005-August-24

Fixed link to advisory in Summary section.

Revision 1.0

2005-August-24

Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.


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