Cisco Security Advisory
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AV:R/AC:L/Au:NR/C:N/I:N/A:C/B:N/E:F/RL:O/RC:C
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Cisco Secure Access Control Server for Windows and Cisco Secure Access Control Server Solution Engine contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
This vulnerability exists due to insufficient handling of malformed RADIUS Access-Request messages. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted RADIUS Access-Request network packet to an affected system, crashing the CSRadius process. This renders the system unresponsive to further RADIUS Authentication, Authorization, and Accounting requests.
Cisco has confirmed this vulnerability in a security advisory and released updated software to correct it.
To exploit this vulnerability, an attacker requires no special authentication credentials and requires no access to shared RADIUS keys. To accomplish an exploit, an attacker needs to send a crafted network request to an affected system. This likely requires the attacker to have access to trusted, internal networks or to be within range of wireless access. In the event of an exploit, attackers can render RADIUS systems unresponsive, denying authentication services to authorized users. TACACS+ functionality will still be operational, however.
Functional exploit code that proves the exploitability of this vulnerability is reported by the vendor but is not available publicly. However, because the viability of exploitation has been proven, attackers may be more likely to develop exploit code.
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Cisco has released a security advisory regarding Cisco Bug ID CSCse18250 at the following link: Cisco SA-20070105-csacs
Vulnerable Products
Systems running the following Cisco products are vulnerable:
- Cisco Secure Access Control Server for Windows 3.1 and 3.2
- Cisco Secure Access Control Server for Windows prior to 3.3.3 build 11
- Cisco Secure Access Control Server for Windows prior to 4.0.1 build 27
- Cisco Secure Access Control Server Solution Engine 3.1 and 3.2
- Cisco Secure Access Control Server Solution Engine prior to 3.3.3 build 11
- Cisco Secure Access Control Server Solution Engine prior to 4.0.1 build 27
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate software updates.
Administrators are advised to secure physical access to wired and wireless networks served by affected systems.
Administrators are advised to monitor systems for signs of exploitation.
Administrators are advised to configure affected services to restart in the case of a service failure.
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Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2007-Jan-05
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