Cisco Security Advisory
Cisco IOS XR Software LPTS Denial of Service Vulnerability
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in the Local Packet Transport Services (LPTS) network stack of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a limited denial of service (DoS) condition on an affected platform.
The vulnerability is due to improper handling of flow base entries by LPTS. This can cause too many known entries for a protocol to be created, causing existing or new sessions to be dropped. An attacker could exploit this vulnerability by sending continuous connection attempts to open TCP ports to cause an exhaustion of services. An exploit could allow the attacker to cause a limited DoS condition on an affected platform.
Cisco has released software updates that address this vulnerability. Workarounds that address this vulnerability are not available.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160519-ios-xr
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Workarounds are not available.
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Information about fixed software is documented in the Cisco bug, which is 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 upgrade 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.
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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 1.2 Removed text limiting the vulnerability to Cisco ASR 9000 Series Aggregation Services Routers. Summary Final 2016-June-08 1.1 Added affected releases. Added a link to the bug search tool for fixed release information. Vulnerable Products, Fixed Software Final 2016-May-20 1.0 Initial public release. - Final 2016-May-19
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