Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and gain unauthorized access to protected networks. Updates are available.
Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and gain unauthorized access to protected networks.
The vulnerability exists in the implementation of the Object Groups for Access Control Lists (ACLs) feature. When this feature has been enabled, an unauthenticated, remote attacker could make crafted requests to the affected device to bypass security ACLs and gain unauthorized access to protected networks.
Cisco has confirmed this vulnerability and released software updates.
Cisco has published a list of affected Cisco IOS Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
This vulnerability only affects devices that have been configured to use the Object Groups for ACLs feature. More details on determining if this feature has been enabled are available in the vendor advisory.
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 bypass security restrictions and gain unauthorized access to protected networks.
Additional technical information is not currently available.
Administrators are advised to apply the appropriate updates.
Administrators may consider disabling the Object Groups for ACLs feature.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
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 firstname.lastname@example.org.
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.