Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the Object-ACL matching process of Cisco Aggregation Services Router 9000 (ASR9K) could allow an unauthenticated, remote attacker to bypass the protection offered by a configured access control list (ACL) on an affected device.
The vulnerability is due to ASR9K incorrectly handling host access control entries by incorrectly matching any address instead of the specified host address. An attacker could exploit this vulnerability to bypass the access control list leading to traffic loss or unwanted permits.
Cisco has confirmed the vulnerability and released software updates.
The impact of an exploit depends on ACLs in use on the affected system. Attackers who could bypass the configured ACLs could gain access to restricted network resources, possibly resulting in attackers gaining access to critical systems. Affected systems are not impacted if no ACLs are configured, or ACLs do not use host values.
Specialized exploit code is not required to exploit the vulnerability.
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Cisco has released bug ID CSCur28806 for registered users that contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Aggregation Services Router 9000 software version 5.3.0.BASE was vulnerable. Other versions of Cisco Aggregation Services Router 9000 software may also be affected.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 updates.
Administrators are advised to replace the host value in configured ACLs with the ip/32 value.
Administrators are advised to monitor affected systems.
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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 email 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 2015-Apr-09
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