Cisco Security Advisory
Cisco Videoscape Distribution Suite for Internet Streaming TCP Session Handling Denial of Service Vulnerability
Medium
Advisory ID:
cisco-sa-20160226-vds-is
First Published:
2016 February 29 00:00 GMT
Last Updated:
2016 April 4 17:56 GMT
Version 1.1:
Workarounds:
Cisco Bug IDs:
CVSS Score:
Base 5.0,
Temporal 4.8
Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:U/RC:C
Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:U/RC:C
-
A vulnerability in TCP connection handling when TCP sessions are terminated via a TCP FIN packet for the Cisco Videoscape Distribution Suite for Internet Streaming (VDS-IS) could allow an unauthenticated, remote attacker to create a denial of service (DoS) condition.
The vulnerability is due to improper TCP session management when a TCP session is in TCP FIN waiting state. The device could fail to respond properly to a new TCP SYN packet to start a new TCP connection. An attacker could exploit this vulnerability by sending TCP traffic streams that could terminate the connection with a TCP FIN. An exploit could allow the attacker to cause a partial DoS condition. When a TCP session is in a TCP FIN waiting state, it is possible that new incoming TCP SYN packets will be dropped silently.
Cisco has not released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160226-vds-is
-
To work around this vulnerability, administrators may disable the TCP timeout option, which is enabled by default.
-
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses 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.
-
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 resolution of a TAC customer case.
-
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 LessVersion Description Section Status Date 1.1 Added information about a workaround. Workarounds Final 2016-April-04 1.0 Initial public release. - Final 2016-February-29
-
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 standalone 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.