how to block log4j weakness on f5 ?

[neeeewbie]

Hi guys 

I need your help !

I checked the log4j version

as I know below version is include log4j weakness, but F5 official documents expain log4j weakness does not include F5 

so, I wonder how to block log4j weakness on f5 ?

please let me know if you know reason !

[Daniel_Wolf · Accepted solution]

Hi ,

according to K19026212 F5 products themselves are not vulnerable. It also describes how to use ASM or AdvWAF or iRules or NGINX App Protect in order to protect applications that are affected by the log4shell vulnerability and which are delivered via BIG-IP or NGINX.

Even if a software is using a log4j version which is affected by CVE-2021-44228, it can still be configured to be safe. As long as formatMsgNoLookups is set to true, lookups with jndi are disabled.

KR

Daniel

[neeeewbie]

really thank you so much!

[PeteWhite]

You can use the iApp at https://devcentral.f5.com/s/articles/Apache-Log4j2-CVE-2021-44228-mitigation-iApp?tag=&page=1