Cisco Security AdvisoryMedium
Advisory ID:
cisco-sa-20160620-isr
First Published:
2016 June 20 20:45 GMT
Last Updated:
2016 October 19 14:36 GMT
Version 1.3:
Workarounds:
No workarounds available
Cisco Bug IDs:
CVSS Score:
Base 5.0,
Temporal 4.1
Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
-
A vulnerability in the handling of remote TCP connections in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition due to low memory.
The vulnerability is due to the handling of out-of-order, or otherwise invalid, TCP packets on a remote connection to an affected device. An attacker could exploit this vulnerability by connecting to the device and then sending crafted TCP packets that are out of order or have invalid flags. An exploit could allow the attacker to cause the device to report low-memory warnings, which could in turn cause a partial DoS condition. This vulnerability was initially found for Secure Shell Host (SSH) remote connections, but it could also affect other remote connections to the device.
Cisco will release software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160620-isr
-
Workarounds that mitigate this vulnerability are not available.
-
Cisco provides information about fixed software in Cisco bugs, which are accessible through the Cisco Bug Search Tool.
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.
-
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 1.3 Cisco bug identifier CSCvb66994 was added. Style edits to Summary (no technical changes). Cisco bug identifier list, Summary Final 2016-October-19 1.2 The summary was modified to remove SSH references as the vulnerability was found to be more general. Title and Summary Final 2016-October-03 1.1 This vulnerability affects Cisco IOS and IOS XE Software. Cisco will release software updates for this vulnerability. Title, Vulnerable Products, and Summary Final 2016-August-18 1.0 Initial public release. — Final 2016-June-20
-
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.