Cisco Security Advisory
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AV:N/AC:M/Au:S/C:P/I:N/A:P/E:F/RL:U/RC:C
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A vulnerability in of the Cisco TelePresence Video Communication Server (VCS) Expressway could allow an authenticated, remote attacker to falsely register their Mobile and Remote Access (MRA) endpoint.
The vulnerability is due to insufficient validation of the registering phone line. An attacker could exploit this vulnerability by sending a crafted Session Initiation Protocol (SIP) message to the VCS Expressway. An exploit could allow the attacker to register their phones and impersonate legitimate users.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, an attacker must authenticate to the targeted device. This access requirement reduces 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.
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Cisco has released bug ID CSCuv40396 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 Expressway release X8.5.2 was vulnerable. Later releases of Cisco TelePresence VCS Expressway 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 are advised to monitor affected systems.
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Software updates are unavailable.
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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-Aug-13
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