cisco-sa-20190807-iosxr-isis-dos-1918: Cisco IOS XR Software Intermediate System-to-Intermediate System Denial of Service Vulnerability

First published: Wed Aug 07 2019(Updated: )

A vulnerability in the implementation of Intermediate System-to-Intermediate System (IS-IS) routing protocol functionality in Cisco IOS XR Software could allow an unauthenticated attacker who is in the same IS-IS area to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of IS-IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending specific link-state PDUs to an affected system to be processed. A successful exploit could allow the attacker to cause incorrect calculations used in the weighted remote shared risk link groups (SRLG) or in the IGP Flexible Algorithm. It could also cause tracebacks to the logs or potentially cause the receiving device to crash the IS-IS process, resulting in a DoS condition. Cisco has released 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-20190807-iosxr-isis-dos-1918 A companion advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-iosxr-isis-dos-1910

Credit: This vulnerability was found during the resolution a Cisco TAC support case

Affected Software	Affected Version	How to fix
Cisco IOS XR	=6.6.1<AA15881=6.5.3<AA15778	AA15881 AA15778

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Reference Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-iosxr-isis-dos-1918 (Advisory)

Child vulnerabilities

(Contains the following vulnerabilities)

CVE-2019-1918

agent/type
agent/last-modified-date
agent/first-publish-date
collector/cisco-advisory
source/Cisco
agent/software-canonical-lookup
agent/weakness
agent/author
agent/severity
agent/title
agent/references
agent/tags
agent/event
agent/softwarecombine
agent/description
vendor/cisco
canonical/cisco ios xr
version/cisco ios xr/6.6.1
version/cisco ios xr/6.5.3

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