Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:N/A:P/E:U/RL:U/RC:C
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A vulnerability in the web interface of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition due to memory management failures during processing of TCP connections.
The vulnerability is due to the improper handling of a malformed HTTP server responses. An unauthenticated, remote attacker with a privileged network position could exploit the vulnerability by conducting a man-in-the-middle (MitM) attack and supplying malformed HTTP server responses to the vulnerable device. A successful exploit could allow the attacker to cause the device to improperly close TCP connections and fail to free memory resources, resulting in a partial DoS condition.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit the vulnerability, the attacker would need to send crafted HTTP requests to the targeted system through the WSA web interface. Because the attacker does not need to authenticate to send the crafted HTTP requests, the likelihood of an exploit is increased.
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Cisco has released Bug ID CSCuv80423, which contains additional details and an up-to-date list of affected products, for registered users.
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Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to implement physical security for production servers.
Administrators are advised to contact the vendor regarding future updates and releases.
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Updates are not available.
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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 Added Cisco Bug ID CSCuv80423. Affected Products Final 2015-December-18 1.0 Initial Public Release. — Final 2015-September-09
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