Cisco Security Advisory
Click Icon to Copy Verbose Score
AV:R/AC:H/Au:NR/C:N/I:N/A:C/B:N/E:F/RL:O/RC:C
-
Cisco Firewall Services Module versions prior to 3.1(3.18) contain a vulnerability that could allow an unauthenticated, remote attacker to create a temporary denial of service (DoS) condition.
The vulnerability is due to an error when handling malformed HTTPS requests on devices that are configured to authenticate users before granting network access. An unauthenticated, remote attacker could exploit this vulnerability by attempting to access an external website utilizing the HTTPS protocol. This action could force Cisco Firewall Services Module to reload, resulting in a temporary DoS condition.
Cisco has confirmed this vulnerability with a security advisory and released updated software.
A successful attack allows the attacker to cause the Cisco Firewall Services Module to reload. The device will automatically restart, causing a temporary DoS condition. Repeated attacks could be utilized to create an extended condition. Because the vulnerability only occurs due to an error in handling the HTTPS request itself and not the URL, the attacker would likely have to utilize a custom application to generate the malicious traffic. An attacker is unlikely to be able to leverage a standard web browser to perform an exploit.
-
Cisco has released a security advisory to address Cisco bug ID CSCsg50228 at the following link: cisco-sa-20070214-fwsm
-
Administrators are advised to apply the update provided by Cisco.
Administrators are advised to restrict access to affected systems.
Administrators are advised to closely monitor affected devices.
-
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.
-
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.
-
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.
-
Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2007-Feb-14
-
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 is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.