Cisco Security Advisory
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AV:N/AC:H/Au:S/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the implementation of the rewriter module of the Cisco Adaptive Security Appliance (ASA) Clientless SSL VPN could allow an authenticated, remote attacker to cause a reload of the affected system.
The vulnerability is due to a race condition while accessing resources via the Common Internet File System (CIFS) protocol. An attacker could exploit this vulnerability by creating multiple Clientless SSL VPN sessions and trying to recreate the race condition.
Cisco has confirmed the vulnerability in a security notice and software updates are available.
To exploit the vulnerability, an attacker would need to authenticate to a targeted system to create multiple Clientless SSL VPN sessions. Typically, such devices reside on trusted, internal networks. This access requirement may reduce the likelihood of a successful attack.
Customers are advised to review the bug report in the Vendor Announcements section for a current list of affected versions.
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 a security notice for bug ID CSCub58996 at the following link: CVE-2013-1199
Vulnerable Products
At the time this alert was first published, Cisco ASA Software versions 8.4.6 and prior were affected. Later versions of Cisco ASA Software may also be affected.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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 allow only privileged users to access administration or management systems.
It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, consult Protecting Your Core: Infrastructure Protection Access Control Lists.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com for assistance.
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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 2013-Apr-17
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