Cisco Security Advisory
Click Icon to Copy Verbose Score
AV:N/AC:M/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
-
Cisco TelePresence ISDN Gateway contains a vulnerability that could allow an unauthenticated, remote attacker to trigger the drop of the data channel (D-channel), causing all calls to be terminated and preventing users from making new calls.
Cisco has released software updates that address this vulnerability. No workarounds that mitigate this vulnerability are available. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140122-isdngw
-
Vulnerable Products
All releases of Cisco TelePresence ISDN Gateway Software prior to 2.2(1.92) running on Cisco TelePresence ISDN GW 3241 or Cisco TelePresence ISDN GW MSE 8321 are affected by this vulnerability.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
-
The Cisco TelePresence ISDN Gateway is a high-performance video gateway that enables ISDN network connectivity for Cisco TelePresence IP-based video infrastructure products as well as IP-based endpoints.
A vulnerability in the code handling the ISDN Q.931 signaling protocol of the Cisco TelePresence ISDN Gateway could allow an unauthenticated, remote attacker to trigger a drop of the data channel (D-channel), causing all calls to be terminated and preventing users from making new calls.
The vulnerability is due to improper handling of a crafted Q.931 STATUS message. An attacker could exploit this vulnerability by injecting crafted packets in the Q.931 flow. An successful exploit could allow the attacker to trigger a drop of the D-channel. As a result, all active calls handled by the affected system will be terminated and it will not be possible to establish new calls until the D-channel communication is restored. A software reload is necessary to restore normal behavior.
This vulnerability is documented in Cisco bug ID CSCui50360 (registered customers only)and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2014-0660.
-
There is no workaround that mitigates this vulnerability.
-
When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
This vulnerability is fixed in Cisco TelePresence ISDN Gateway Software 2.2(1.92) and later.
-
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.
This vulnerability was found during the resolution of a customer service request.
-
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.
-
Show LessRevision 1.0 2014-January-22 Initial public release
-
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.