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Credit:
The information has been provided by Cisco Systems Product Security Incident Response Team.
The original article can be found at: http://www.cisco.com/warp/public/707/cisco-sa-20070105-csacs.shtml
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Vulnerable Products:
The following products are vulnerable to one or more of the vulnerabilities, when running software versions prior to 4.1:
* Cisco Secure Access Control Server for Windows
* Cisco Secure Access Control Server Solution Engine
To determine if you are running a vulnerable version of Cisco Secure ACS, first log into the Web administrative session for Cisco Secure ACS and on the home page at the bottom section of the screen will be the release information. 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.
Affected Cisco Secure ACS services, and the impact of the vulnerabilities are as follows:
* Specially Crafted HTTP GET Request Vulnerability: Processing a specially crafted HTTP GET request may crash the CSAdmin service. This vulnerability is also susceptible to a stack overflow condition.
* Specially Crafted RADIUS Accounting-Request Vulnerability: Processing a specially crafted RADIUS Accounting-Request packet may crash the CSRadius service. This vulnerability is also susceptible to a stack overflow condition.
* Specially Crafted RADIUS Access-Request Vulnerabilities: Processing a specially crafted RADIUS Access-Request packet may crash the CSRadius service.
Details:
Cisco Secure ACS is a scalable, high-performance Remote Access Dial-In User Service (RADIUS) and Terminal Access Controller Access Control System Plus (TACACS+) security server.
Multiple vulnerabilities exist in certain versions of the Cisco Secure ACS that may cause the services CSAdmin or CSRadius to crash.
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.
While CSAdmin is in the stopped state, users cannot access the Cisco Secure ACS administrative interface from any computer other than the Windows server or appliance on which it is running. With Cisco Secure ACS for Windows you can start or stop CSAdmin from the Windows Control Panel. With Cisco Secure ACS Solution Engine, you can restart the service by using only the appliance serial console.
For further details on starting the CSAdmin service please refer to: http://www.cisco.com/univercd/cc/td/doc/product/access/acs_soft/csacs4nt/acs41/user/a_arch.htm#wp7264
This vulnerability is documented in Cisco Bug ID:
* CSCsd96293 -
Stack based overflow within CSAdmin when processing HTTP GET request
Specially Crafted RADIUS Accounting-Request Vulnerability:
This vulnerability is exploited by processing a specially crafted RADIUS Accounting-Request packet. 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.
The RADIUS secret key that is shared between the Network Access Server (NAS) and the Cisco Secure ACS server and/or appliance is required to exploit this vulnerability.
This vulnerability is documented in Cisco Bug ID:
* CSCse18278 - Stack based overflow within CSRadius when processing Accounting-Request. (CVE-2006-4098)
Specially Crafted RADIUS Access-Request Vulnerabilities:
Several vulnerabilities exist in Cisco Secure ACS that may cause the CSRadius service to crash when processing a specially crafted RADIUS Access-Request packet. 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.
The RADIUS secret key that is shared between the Network Access Server (NAS) and the Cisco Secure ACS server and/or appliance is not required to exploit these vulnerabilities.
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.
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.
Specially Crafted RADIUS Accounting-Request Vulnerability:
Successful exploitation may result in RADIUS Authentication, Authorization and Accounting processing to not be performed until the CSRadius service is restarted. 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.
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