IntelliShield has updated this alert to reflect changes to the CVE identifier.
A vulnerability in the SSL logging daemon of Cisco Application Control Engine (ACE) could allow an unauthenticated, remote attacker to cause a denial of service condition on the affected device.
The vulnerability occurs because the Cisco ACE fails to rotate logs from SSL sessions, exhausting the hard drive of free space. An attacker could exploit this vulnerability by sending excessive amounts of SSL connections to the affected device. An exploit could allow the attacker to exhaust remaining free space on the hard drive, causing operations such as configuration and writing configurations on the disk to fail. Additional errors can be observed on the Cisco ACE console.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
At the time this alert was first published, Cisco ACE version A2(3.6) is vulnerable. Later versions of Cisco ACE may also be affected.
To exploit this vulnerability, an attacker may require access to a trusted, internal network to send a series of SSL connections to the targeted system. This access requirement could limit the likelihood of a successful exploit.
Customers are advised to review the bug reports in the "Vendor Announcements" section for a current list of affected versions.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An unauthenticated, remote attacker could exploit this vulnerability to exhaust free space on the hard drive of an affected device, causing operations on the disk to fail. Successful exploitation could result in a denial of service (DoS) condition.
The vulnerability is due to the affected software failing to rotate logs from SSL sessions.
An unauthenticated, remote attacker could exploit this vulnerability by sending excessive amounts of SSL connections to the targeted device. Successful exploitation could exhaust the remaining free space on the hard drive, causing tasks dependent on the hard drive to fail, resulting in a DoS condition.
Administrators are advised to contact the vendor regarding future updates and releases.
Cisco customers may contact the Cisco Technical Assistance Center (TAC) at 1-800-553-2447 or 1-408-526-7209 or via e-mail at email@example.com for assistance in applying a workaround to mitigate this vulnerability.
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.
Software updates are not available.
Version 1, May 16, 2013, 3:02 PM: Cisco Application Control Engine contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are not available.
The security vulnerability applies to the following combinations of products.
Cisco ACE Application Control Engine Module
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.