Cisco Security Advisory
Cisco Web Security Appliance Security Bypass Vulnerability
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AV:N/AC:L/Au:N/C:N/I:P/A:N/E:F/RL:OF/RC:C
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A vulnerability in the proxy engine of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass security restrictions.
The vulnerability is due to improper handling of malformed HTTP methods. An attacker could exploit this vulnerability by crafting an improper HTTP method. A successful exploit could allow the attacker to circumvent WSA functionality that prevents proxied network traffic.
Cisco released software updates that address this vulnerability. There are no workarounds that mitigate this vulnerability.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160119-wsa
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There are no workarounds that mitigate 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 1.0 Initial public release. - Final 2016-January-19
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