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Cisco Security Advisory 20160518-wsa3

Cisco Security Advisory 20160518-wsa3
Posted May 18, 2016
Authored by Cisco Systems | Site cisco.com

Cisco Security Advisory - A vulnerability in HTTP request parsing in Cisco AsyncOS for the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the proxy process unexpectedly restarts. The vulnerability occurs because the affected software does not properly allocate space for the HTTP header and any expected HTTP payload. 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 when the proxy process unexpectedly reloads, which can cause traffic to be dropped. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

tags | advisory, remote, web, denial of service
systems | cisco
MD5 | 8226bcbc16a703150b3d935f27d1b7e7

Cisco Security Advisory 20160518-wsa3

Change Mirror Download
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Cisco Web Security Appliance HTTP Length Denial of Service Vulnerability

Advisory ID: cisco-sa-20160518-wsa3

Revision 1.0

For Public Release 2016 May 18 16:00 UTC (GMT)

+---------------------------------------------------------------------

Summary
=======

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

The vulnerability occurs because the affected software does not properly allocate space for the HTTP header and any expected HTTP payload. 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 when the proxy process unexpectedly reloads, which can cause traffic to be dropped.

Cisco has released software updates that address this vulnerability. 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-20160518-wsa3

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