AV:N/AC:L/Au:S/C:N/I:P/A:N/E:F/RL:OF/RC:C
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A vulnerability in the SSL VPN code of Cisco ASA Software could allow an authenticated, remote attacker to overwrite arbitrary files present on the RAMFS file system or inject Lua scripts.
The vulnerability is due to insufficient validation of the code that handles session information for the SSL VPN when a SharePoint handler is created. A SharePoint handler is created when a valid SharePoint connection is initiated. An attacker could exploit this vulnerability by sending crafted HTTP requests to the affected system. The SSL VPN feature must be configured for the system to be vulnerable.
An exploit could allow the attacker to overwrite arbitrary files on the RAMFS cache or inject Lua scripts, causing a denial of service (DoS) condition for the Clientless SSL VPN portal or causing the system to reload.
This vulnerability was reported to Cisco by Alec Stuart-Muirk.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker must authenticate to the targeted device. This access requirement may reduce the likelihood of a successful exploit. In addition, an attacker would need to determine whether the targeted device has the SSL VPN feature configured, which is a condition that must be met to achieve a successful exploit.
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Customers are advised to consult Cisco bug IDs CSCup54208 and CSCup54184 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASA Software Releases 9.2(.2.4) and prior were vulnerable. Later releases Cisco ASA Software may also be vulnerable.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.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
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 email 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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Version Description Section Status Date 1.0 Cisco ASA Software contains a vulnerability that could allow an authenticated, remote attacker to overwrite arbitrary files and cause a denial of service condition on a targeted system. Updates are available. NA Final 2014-Oct-06
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