Cisco Security Advisory
Cisco Adaptive Security Appliance Non-DCERPC Traffic Bypass Vulnerability
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AV:N/AC:M/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the Distributed Computing Environment/Remote Procedure Calls (DCERPC) Inspection feature of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to send traffic that is not DCERPC between hosts configured only for DCERPC inspection. The DCERPC traffic should be allowed only on TCP port 135.
The vulnerability is due to an internal access control list (ACL), which is used to allow DCERPC traffic but is incorrectly programmed to allow all traffic types and not restricted to DCERPC TCP port 135. An attacker could exploit this vulnerability by sending non-DCERPC traffic between hosts configured for DCERPC inspection that would normally be dropped. An exploit could allow the attacker to access hosts that should normally be restricted through the ASA.
Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160111-asa
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There are no workarounds that address this vulnerability.
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
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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 1.1 Updated the CVSS score. - Final 2016-January-20 1.0 Initial public release. - Final 2016-January-11
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