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Cisco Security Advisory: Cisco Physical Access Gateway Denial of Service Vulnerability

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From: Cisco Systems Product Security Incident Response Team <>
Subject: Cisco Security Advisory: Cisco Physical Access Gateway Denial of Service Vulnerability
Date: Wednesday, 24 June 2009 11:00:00 -0500
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Cisco Security Advisory: Cisco Physical Access Gateway Denial of
Service Vulnerability

Advisory ID: cisco-sa-20090624-gateway

Revision 1.0

For Public Release 2009 June 24 1600 UTC (GMT)



A denial of service (DoS) vulnerability exists in the Cisco Physical
Access Gateway. There are no workarounds available to mitigate the
vulnerability. This vulnerability has been corrected in Cisco
Physical Access Gateway software version 1.1. Cisco has released free
software updates that address this vulnerability.

This advisory is posted at:

Affected Products

Vulnerable Products

Cisco Physical Access Gateway running software versions prior to 1.1
are vulnerable.

Products Confirmed Not Vulnerable

Cisco Physical Access Gateway running software versions 1.1 or later
are not vulnerable. No other Cisco products are currently known to be
affected by this vulnerability.


The Cisco Physical Access Gateway is the primary means for the Cisco
Physical Access Control solution to connect door hardware, such as
locks and readers, to an IP network. Certain crafted TCP port 443
packets may cause a memory leak that could lead to a denial of
service (DoS) condition in the Cisco Physical Access Gateway. A TCP
three-way handshake is needed to exploit this vulnerability.

This vulnerability is documented in Cisco Bug ID CSCsu95864 and has
been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2009-1163.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerability 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: Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at: CSCsu95864 - Memory leak with certain IP packets CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed Impact ====== Successful exploitation of the vulnerability described in this document may result in a memory leak. The issue could be repeatedly exploited to cause an extended DoS condition. Connected door hardware, such as card readers, locks, and other input/output devices will function intermittently during extended DoS exploitation. Doors will remain open or locked depending on the gateway's configuration. Software Versions and Fixes
When considering software upgrades, also consult and any subsequent advisories to determine exposure and a complete upgrade solution. In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance. This vulnerability has been corrected in Cisco Physical Access Gateway software version 1.1 and can be downloaded from the following link: Workarounds =========== No workarounds are available; however, mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory, which is available at the following link: Obtaining Fixed Software
Cisco has released free software updates that address this vulnerability. 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:/ or as otherwise set forth at Downloads at: Do not contact or 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 Customers using Third Party Support Organizations +------------------------------------------------ Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory. The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed. Customers without Service Contracts +---------------------------------- Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire 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: Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC. Refer to: for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages. Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. This vulnerability was found during internal testing. 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 is posted on Cisco's worldwide website at : 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. * * * * * * * * 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 | | Initial | | 1.0 | 2009-June-24 | 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: This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at: -----BEGIN PGP SIGNATURE----- iD8DBQFKQkn886n/Gc8U/uARArPGAJ9nfApuGoc+vhDOdoMMsmJCQCYlewCgmNk3 Fumou3/8V80HhnX9X+i8HUw= =8C2N -----END PGP SIGNATURE-----

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