ID

VAR-200612-0484

CVE

CVE-2006-4097

TITLE

Cisco Secure Access Control Server vulnerable to a stack-based buffer overflow via a specially crafted "HTTP GET" request

DESCRIPTION

Multiple unspecified vulnerabilities in the CSRadius service in Cisco Secure Access Control Server (ACS) for Windows before 4.1 and ACS Solution Engine before 4.1 allow remote attackers to cause a denial of service (crash) via a crafted RADIUS Access-Request packet. NOTE: it has been reported that at least one issue is a heap-based buffer overflow involving the Tunnel-Password attribute. Versions prior to 4.1 are vulnerable to these issues. Two of the vulnerabilities may permit arbitrary code execution after exploitation of the specified vulnerability. This vulnerability is also susceptible to a stack overflow condition. This vulnerability is also susceptible to a stack overflow condition. Cisco has made free software available to address this issue for affected customers. We would like to thank CESG's Vulnerability Research Group and National Infrastructure Security Co-ordination Centre (NISCC) for reporting several of these vulnerabilities to Cisco Systems. We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist in product reports. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070105-csacs.shtml. The following example would be seen when running Cisco Secure ACS software version 4.0(1) Build 27: CiscoSecure ACS ACS software version 4.0(1) Build 27: Copyright information is seen underneath this information. Products Confirmed Not Vulnerable +-------------------------------- * Cisco Secure ACS for Unix (CSU). * Cisco CNS Access Registrar (CAR). * Cisco Secure ACS server for Windows version 4.1(X) or later. * Cisco Secure ACS server solution Engine version 4.1(X) or later. CSAdmin is the service that provides the web server for the ACS web administration interface. CSRadius is the service that communicates between the CSAuth module (the authentication and authorization service) and the access device that is requesting authentication and authorization services. Specially Crafted HTTP GET Request Vulnerability: +------------------------------------------------ This vulnerability is exploited by processing a specially crafted HTTP GET request. Upon successful exploitation, the CSAdmin service may crash. This vulnerability is also susceptible to a stack based overflow condition which may allow arbitrary code execution if successfully exploited. If this vulnerability is successfully exploited, the CSAdmin service will require a manual restart of the service. Normal Authentication, Authorization and Accounting (AAA) processing will continue. With Cisco Secure ACS for Windows you can start or stop CSAdmin from the Windows Control Panel. Upon successful exploitation, the CSRadius service may crash and an exception trap error will be generated for the CSRadius service within the Windows Event Viewer System log. This vulnerability is also susceptible to a stack based overflow condition which may allow arbitrary code execution if successfully exploited. This vulnerability is documented in Cisco Bug ID: * CSCse18278 -- Stack based overflow within CSRadius when processing Accounting-Request. These vulnerabilities will not allow arbitrary code execution after successful exploitation. An exception trap error will be recorded within the CSRadius log file and an error will be seen for the CSRadius service within the Windows Event Viewer System log after successful exploitation. These vulnerabilities are documented in Cisco Bug IDs: * CSCse18250 -- CSRadius Service crashes when processing a specially crafted Access-Request packet. (CVE-2006-4097) * CSCeg04788 -- CSRadius Service crashes when processing a specially crafted Access-Request packet. * CSCeg04666 -- CSRadius Service crashes when processing a specially crafted Access-Request packet. Vulnerability Scoring Details ============================= Cisco is providing scores for the vulnerabilities in this advisory based Con the ommon Vulnerability Scoring System (CVSS). Cisco will provide a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks. Cisco PSIRT will set the bias in all cases to normal. Customers are encouraged to apply the bias parameter when determining the environmental impact of a particular vulnerability. CVSS is a standards based scoring method that conveys vulnerability severity and helps determine urgency and priority of response. 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. Cisco Bug IDs: CSCsd96293 - Stack based overflow within CSAdmin when processing HTTP GET request +--------------------------------------- CVSS Base Score - 10 Access Vector: Remote Access Complexity: Low Authentication: Not Required Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete Impact Bias: Normal CVSS Temporal Score - 8.3 Exploitability: Functional Remediation Level: Official Fix Report Confidence: Confirmed CSCse18278 - Stack based overflow within CSRadius when processing Accounting-Request +------------------------------------------ CVSS Base Score - 6.0 Access Vector: Remote Access Complexity: Low Authentication: Required Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete Impact Bias: Normal CVSS Temporal Score - 5.0 Exploitability: Functional Remediation Level: Official Fix Report Confidence: Confirmed CSCse18250 - CSRadius Service crashes when processing a specially crafted Access-Request packet. +---------------------------------------------------- CVSS Base Score - 3.3 Access Vector: Remote Access Complexity: Low Authentication: Not Required Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete Impact Bias: Normal CVSS Temporal Score - 2.7 Exploitability: Functional Remediation Level: Official Fix Report Confidence: Confirmed CSCeg04788 - CSRadius Service crashes when processing a specially crafted Access-Request packet. +---------------------------------------------------- CVSS Base Score - 3.3 Access Vector: Remote Access Complexity: Low Authentication: Not Required Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete Impact Bias: Normal CVSS Temporal Score - 2.7 Exploitability: Functional Remediation Level: Official Fix Report Confidence: Confirmed CSCeg04666 - CSRadius Service crashes when processing a specially crafted Access-Request packet. +---------------------------------------------------- CVSS Base Score - 3.3 Access Vector: Remote Access Complexity: Low Authentication: Not Required Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete Impact Bias: Normal CVSS Temporal Score - 2.7 Exploitability: Functional Remediation Level: Official Fix Report Confidence: Confirmed Impact ====== Specially Crafted HTTP GET Request Vulnerability: +------------------------------------------------ Successful exploitation may result in the web administrative interface being unavailable until the CSAdmin Service is restarted from windows control panel. Normal Authentication, Authorization and Accounting (AAA) processing will continue. This vulnerability may allow arbitrary code execution if successfully exploited. TACACS+ Authentication, Authorization and Accounting (AAA) processing will continue. Repeated exploitation could result in a sustained Denial-of-Service (DoS) condition of the RADIUS AAA services. This vulnerability may allow arbitrary code execution if successfully exploited. Specially Crafted RADIUS Access-Request Vulnerabilities: +------------------------------------------------------- Successful exploitation may result in RADIUS Authentication, Authorization and Accounting processing to not be performed as the CSRadius service restarts. TACACS+ Authentication, Authorization and Accounting (AAA) processing will continue. Repeated exploitation could result in a sustained Denial-of-Service (DoS) condition of the RADIUS AAA services. Software Version and Fixes ========================== When considering software upgrades, also consult http://www.cisco.com/go/psirt 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. Each row of the software table (below) describes one of the vulnerabilities described in this document. For each vulnerability the earliest possible Release that contains the fix is listed in the "Availability of First Fixed Release" column. A device running a release that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. The release should be upgraded at least to the indicated release or a later version (greater than or equal to the First Fixed Release label) or the appropriate patch applied. +-----------------------------------------------------------------------------+ | Vulnerability | Major Software | Availability of First Fixed | | | Release | Releases * | |--------------------------+------------------+-------------------------------| | | 3.1(X) | Vulnerable; Contact TAC | | |------------------+-------------------------------| | | 3.2(X) | Vulnerable; Contact TAC | | |------------------+-------------------------------| | HTTP Vulnerability | 3.3(X) | 3.3(4) Build 12. | | |------------------+-------------------------------| | | 4.0(X) | Apply patch **. | | |------------------+-------------------------------| | | 4.1(X) | Are not vulnerable | |--------------------------+------------------+-------------------------------| | | 3.1(X) | Vulnerable; Contact TAC | | |------------------+-------------------------------| | | 3.2(X) | Vulnerable; Contact TAC | | Accounting-Request |------------------+-------------------------------| | Vulnerability | 3.3(X) | 3.3(4) Build 12. | | |------------------+-------------------------------| | | 4.0(X) | 4.0(1) Build 27. | | |------------------+-------------------------------| | | 4.1(X) | Are not vulnerable | |--------------------------+------------------+-------------------------------| | | 3.1(X) | Vulnerable; Contact TAC | | |------------------+-------------------------------| | | 3.2(X) | Vulnerable; Contact TAC | | Access-Request |------------------+-------------------------------| | Vulnerabilities | 3.3(X) | 3.3(3) Build 11. | | |------------------+-------------------------------| | | 4.0(X) | 4.0(1) Build 27. | | |------------------+-------------------------------| | | 4.1(X) | Are not vulnerable | |-----------------------------------------------------------------------------| | Notes: | | | | * 3.3(4) Build 12 is available by contacting Cisco TAC. The effectiveness of any mitigation 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 mitigation or fix is the most appropriate for use in the intended network before it is deployed. Additional mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Intelligence companion document for this advisory: http://www.cisco.com/warp/public/707/cisco-air-20070105-csacs.shtml * Infrastructure ACLs (iACL) Apply access control lists (ACLs) on routers, switches and firewalls that filter traffic to the ACS so that traffic is only allowed from stations that need to remotely administer the box, or be authenticated, authorized, or provide accounting data against/to the ACS server. Refer to http://www.cisco.com/warp/public/707/iacl.html for examples on infrastructure ACLs. * Anti-Spoofing To prevent spoofed IP packets with the source IP address set to that of the Cisco Secure ACS administrative management station from reaching the Cisco Secure ACS server, utilize anti-spoofing techniques. For more information on utilizing ACLs for anti-spoofing, refer to http://www.cisco.com/warp/public/707/21.pdf and http://www.ietf.org/rfc/rfc2827.txt. The Unicast Reverse Path Forwarding (Unicast RPF) feature helps to mitigate problems that are caused by forged IP source addresses that are passing through a router. Refer to http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_c/fothersf/scfrpf.htm for more information. Obtaining Fixed Software ======================== Cisco will make free software available to address this vulnerability for affected customers. This advisory will be updated as fixed software becomes available. 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 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 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 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. Refer to 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. Exploitation and Public Announcements ===================================== The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. Several of these vulnerabilities were reported to Cisco by CESG's Vulnerability Research Group and National Infrastructure Security Co-ordination Centre (NISCC). 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: http://www.cisco.com/warp/public/707/cisco-sa-20070105-csacs.shtml 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 * bugtraq@securityfocus.com * vulnwatch@vulnwatch.org * 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 1.0 | 2007-January-05 | 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/en/US/products/products_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. - ------------------------------------------------------------------------------- All contents are Copyright 1992-2007 Cisco Systems, Inc. All rights reserved. - ------------------------------------------------------------------------------- Updated: Jan 05, 2007 Document ID: 77820 - ------------------------------------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFFnttc8NUAbBmDaxQRAu2sAKCLWvE0/RoF2Oxk1pC6LCaiUFuzOwCfQJVj Q2yeDW5/B49hRvkfrxDEKnY= =A5Tw -----END PGP SIGNATURE----- . ---------------------------------------------------------------------- Secunia is proud to announce the availability of the Secunia Software Inspector. The Secunia Software Inspector is a free service that detects insecure versions of software that you may have installed in your system. When insecure versions are detected, the Secunia Software Inspector also provides thorough guidelines for updating the software to the latest secure version from the vendor. ORIGINAL ADVISORY: http://www.cisco.com/warp/public/707/cisco-sa-20070105-csacs.shtml ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

buffer overflow

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

The vendor reported these issues.

SOURCES

LAST UPDATE DATE

2024-11-23T22:04:08.507000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE