A vulnerability in the mobility extension support of Cisco Unified IP Phone 9900 Series could allow an unauthenticated, remote attacker to log off the mobility extension user.
The vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted packets to an affected device. An exploit could allow the attacker to cause a denial of service (DoS) condition in which the user is no longer associated with the device and must log in again.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
To exploit this vulnerability, the attacker may need access to trusted, internal networks behind a firewall to send crafted packets to the targeted device. This access requirement may reduce 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.
Customers are advised to consult Cisco bug ID CSCuq12139 for a complete list of affected product versions.
Vulnerable ProductsAt the time this alert was first published, Cisco Unified IP Phone 9900 Series Firmware versions 9.4(.1) and prior were vulnerable. Later versions may also be vulnerable.
Products Confirmed Not VulnerableNo other Cisco products are currently known to be affected by these vulnerabilities.
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.
Software updates are not available.
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.
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.
Version Description Section Status Date 1.0 Initial Release NA Final 2015-Feb-04
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