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 port or address range compression feature for access control lists (ACLs) on Typhoon line cards in Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device.
The vulnerability is due to incorrect port or address range encoding in the compression module of an ACL applied to an interface of an affected device. An attacker could exploit this vulnerability by sending traffic through an affected device that should otherwise be denied by the configured ACL. An exploit could allow the attacker to bypass protection offered by a configured ACL on an affected device.
Cisco has confirmed the vulnerability in a security notice and released software updates.
A successful exploit could allow an attacker to access trusted, internal networks that the targeted device is likely protecting. If the attacker gains access, the attacker could conduct further attacks.
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Customers are advised to consult Cisco bug ID CSCup30133 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco IOS XR Software Releases 5.1 and prior were vulnerable. Later releases Cisco IOS XR Software may also be vulnerable.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 allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
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.
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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 tac@cisco.com for assistance.
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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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Version Description Section Status Date 1.0 Initial Release NA Final 2014-Oct-06
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