Cisco Web Security Appliance (WSA): Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.3044
   Cisco Web Security Appliance HTTP URL Denial of Service Vulnerability
                             20 December 2016

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

Product:           Cisco Web Security Appliance (WSA)
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-6469  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-wsa

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Cisco Security Advisory

Cisco Web Security Appliance HTTP URL Denial of Service Vulnerability

Medium

Advisory ID: cisco-sa-20161207-wsa

First Published: 2016 December 7 16:00 GMT

Version 1.0: Final

Workarounds: No workarounds available

Cisco Bug IDs: CSCvb04312

CVSS Score: Base 5.0, Temporal 4.1

CVE-2016-6469

CWE-399

Summary
A vulnerability in HTTP URL parsing of Cisco AsyncOS for Cisco Web 
Security Appliance (WSA) could allow an unauthenticated, remote attacker to 
cause a denial of service (DoS) vulnerability due to the proxy process 
unexpectedly restarting.

The vulnerability is due to improper input validation of the HTTP URL 
string. An attacker could exploit this vulnerability by sending a crafted HTTP
request to the affected device. An exploit could allow the attacker to cause a
DoS condition due to the proxy process restarting.

There are no workarounds that address this vulnerability.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-wsa

Affected Products
Vulnerable Products All Cisco WSA software versions prior to the first 
fixed release are vulnerable. 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
There are no workarounds that address this vulnerability.

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.

URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-wsa

Revision History
Version 	Description 		Section 	Status 	Date
1.0 		Initial public release. — 		Final 	2016-December-07

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.

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