Cisco Security Advisory
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AV:N/AC:H/Au:N/C:N/I:N/A:C/E:H/RL:U/RC:C
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A vulnerability in the Session Description Protocol (SDP) parser of the Cisco TelePresence Video Communication Server (VCS) could allow an unauthenticated, remote attacker to cause the Cisco VCS device to become unreachable due to a denial of service (DoS) attack caused by high CPU utilization.
The vulnerability is due to a parsing error in the SDP parameter negotiation request. An attacker could exploit this vulnerability by initiating an SDP session over a Session Initiation Protocol (SIP) connection to the Cisco VCS device and sending a crafted SDP parameter negotiation request. A successful exploit could allow the attacker to take the VCS device offline due to high CPU utilization, resulting in a DoS condition.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, an attacker would need to send a crafted SDP parameter negotiation request to the targeted device. Depending on where the targeted system resides in an environment, an attacker may need to bypass firewall restrictions or other protection measures, which may reduce the likelihood of a successful exploit.
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Cisco has released bug ID CSCut42422 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco TelePresence VCS version X8.5RC4 was vulnerable. Later versions of Cisco TelePresence VCS 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 can help protect affected systems from external attacks by using a solid firewall strategy.
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 2015-Jun-09
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