cisco-sa-bgp-ErKEqAer: Cisco IOS XR Software Additional Paths Denial of Service Vulnerability
First published: Wed Aug 05 2020(Updated: )
A vulnerability in the Border Gateway Protocol (BGP) additional paths feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent authorized users from monitoring the BGP status and cause the BGP process to stop processing new updates, resulting in a denial of service (DOS) condition. The vulnerability is due to an incorrect calculation of lexicographical order when displaying additional path information within Cisco IOS XR Software, which causes an infinite loop. An attacker could exploit this vulnerability by sending a specific BGP update from a BGP neighbor peer session of an affected device; an authorized user must then issue a show bgp command for the vulnerability to be exploited. A successful exploit could allow the attacker to prevent authorized users from properly monitoring the BGP status and prevent BGP from processing new updates, resulting in outdated information in the routing and forwarding tables. 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-bgp-ErKEqAer
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | =6.5.3<ASR9K | ASR9K |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco IOS XR Software vulnerability?
The vulnerability ID for this Cisco IOS XR Software vulnerability is cisco-sa-bgp-ErKEqAer.
What is the title of this vulnerability?
The title of this vulnerability is 'Cisco IOS XR Software Additional Paths Denial of Service Vulnerability.'
What is the severity rating of this vulnerability?
The severity rating of this vulnerability is medium with a value of 4.3.
Which Cisco product and version are affected by this vulnerability?
This vulnerability affects Cisco IOS XR Software version 6.5.3 up to exclusive ASR9K.
How can this vulnerability be fixed?
To fix this vulnerability, apply the recommended software update provided by Cisco.
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