Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:P/A:N/E:POC/RL:U/RC:C
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A vulnerability in the NetBIOS logout probe feature of the Identity Firewall (IDFW) feature of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to impact the authorization status of users authorized via this feature.
The vulnerability is due to insufficient validation of the NetBIOS probe response. An attacker could exploit this vulnerability by sending a crafted NetBIOS probe response. An exploit could allow the attacker to impact access of a currently authorized user.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send a crafted NetBIOS probe response to a targeted device. This access requirement limits the possibility of a successful exploit.
Cisco indicates through the CVSS score that proof-of-concept exploit code exists; however, the code is not known to be publicly available.
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Customers are advised to consult Cisco bug ID CSCuj45340 for a complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASA Software versions 9.1(.3) and prior were vulnerable. Later releases of 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 contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
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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Software 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 1.0 Initial Release NA Final 2014-Jan-08
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