Cisco Security Advisory
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AV:N/AC:L/Au:S/C:N/I:N/A:P/E:F/RL:OF/RC:C
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The Cisco ASA 5500 Series Adaptive Security Appliance contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to the improper handling of user-supplied requests by an affected system when configured to use the clientless WebVPN feature. An authenticated, remote attacker can exploit this vulnerability by submitting requests while the clientless WebVPN feature is enabled, causing excessive memory consumption. If successful, an attacker could cause a blank response page, resulting in a DoS condition.
Cisco has confirmed this vulnerability and released software updates.
To successfully exploit this vulnerability, the WebVPN feature must be enabled on the device. In addition, an attacker must be able to authenticate to a targeted device. To achieve this objective, the attacker may need access to trusted, internal networks. This access requirement decreases the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Cisco has released release notes for Cisco bug ID CSCth34278 at the following link: Cisco ASA Interim Release Notes
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Administrators are advised to allow only privileged users to access administration or management systems.
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Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
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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 Release NA Final 2012-Aug-09
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