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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.0694
            Cisco Adaptive Security Appliance BGP Bidirectional
               Forwarding Detection ACL Bypass Vulnerability
                               16 March 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Adaptive Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2017-3867  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asa

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Cisco Security Advisory

Cisco Adaptive Security Appliance BGP Bidirectional Forwarding Detection ACL
Bypass Vulnerability

Medium
Advisory ID:     cisco-sa-20170315-asa
First Published: 2017 March 15 16:00  GMT
Version 1.0:     Final
Workarounds:     Yes
Cisco Bug IDs:
CSCvc68229
CVE-2017-3867
CWE-264
CVSS Score:
Base 5.8, Temporal 5.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X

Summary

A vulnerability in the Border Gateway Protocol (BGP) Bidirectional
Forwarding Detection (BFD) implementation of Cisco Adaptive Security
Appliance (ASA) Software could allow an unauthenticated, remote attacker to
bypass the access control list (ACL) for specific TCP and UDP traffic.

The vulnerability occurs because the BFD implementation incorrectly allows
traffic with destination ports 3784 and 3785 through the interface ACLs. An
attacker could exploit this vulnerability by sending TCP or UDP packets
with a destination port of 3784 or 3785 through the ASA.

Workarounds that address this vulnerability are available.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-asa

Affected Products

Vulnerable Products

This vulnerability affects Cisco ASA Software. For information about
affected software releases, consult the Cisco bug ID(s) at the top of this
advisory.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this
vulnerability.

Workarounds

Administrators may consider explicitly blocking TCP and UDP for ports 3784
and 3785 on the ingress ACL for the appropriate interfaces.

Fixed Software

For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.

When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded
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.

Exploitation and Public Announcements

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.

Cisco Security Vulnerability Policy

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.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisorycisco-sa-20170315-asa

Revision History

Version         Description         	 Section  	Status        	Date      
1.0       	Initial public release.              	Final   	2017-March-15  

Legal Disclaimer

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.

Cisco Security Vulnerability Policy

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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