Cisco Content Services Gateway contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions. Updates are available.
A vulnerability in the parse error drop function of the Cisco Content Services Gateway (CSG) could allow an unauthenticated, remote attacker to bypass configured policies.
The vulnerability is due to invalid processing in the parse error drop function. An attacker could exploit this vulnerability by sending a specific sequence of packets. An exploit could allow the attacker to potentially bypass access policies.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco IOS Software Releases 12.4(24)MDB9 and prior were vulnerable. Later releases may also be vulnerable.
To exploit this vulnerability, it is likely that an attacker would need access to trusted, internal networks in which the targeted device may reside to send a sequence of packets to be processed by the device. This access requirement may reduce the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2013-5552
Customers are advised to consult Cisco bug ID CSCug90143 for a complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to bypass configured policies on an affected device. A successful exploit could be used to conduct further attacks.
The vulnerability is due to invalid processing in the parse error drop function of an affected device.
An unauthenticated, remote attacker could exploit this vulnerability by sending a specific sequence of packets. An exploit could allow the attacker to bypass access policies, which could be used to conduct further attacks.
Administrators are advised to apply the appropriate updates
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at firstname.lastname@example.org for assistance.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.