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Atlassian Confluence Critical CVE-2021-26084 Mitigation with F5 ASM / F5 WAF

samstep
MVP
MVP

The Confluence CVE-2021-26084 critical vulnerability is in active exploitation, quick mitigation on ASM is to add the following URL to the Disallowed URL:

 

/pages/createpage-entervariables.action

 

Make sure that you enable blocking on the 'Ilegal URL' violation.

 

Patch/update your Confluence:

 

Link to Confluence Security Advisory - 2021-08-25:

https://confluence.atlassian.com/doc/confluence-security-advisory-2021-08-25-1077906215.html

1 REPLY 1

samstep
MVP
MVP

This is how attackers currently bypass WAF:

 

https://twitter.com/Jok3rDb/status/1434099427862482952

 

The "quick mitigation" on ASM is to

 

Disallow URL:

 

/pages/createpage-entervariables.action