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The organization I work for uses Malicious Domain Blocking and Reporting (MDBR), which is a service provided by Center for Internet Security (CIS). MDBR technology prevents IT systems from connecting to harmful web domains, helping limit infections related to known malware, ransomware, phishing, and other cyber threats. (source) From what I gather this is a new tool and has been adopted primarily by government agencies.

Recently two major application libraries were identified as malicious content: code.jQuery.com and fonts.gstatic.com. Applications were in a broken state until we alerted our security team that there was an issue. Their feedback was essentially: We don't have control over what is included on the MDBR block list. We trust CIS and if they are blocking there is a good reason for it.

Can anyone with experience with this security tool speak to the issue? Have you seen major assets be blocked by MDBR? If so, how did you remedy the issue? It is alarming that jQuery would be blocked. If it is a legitimate concern the entire programming/security community would be screaming. If it isn't, why is it on the MDBR block list?

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  • They can't control the list. They can control what they do with the list ...
    – schroeder
    Sep 15 '21 at 22:37
  • Their FAQ tells you what to do about false positives: Please report any false positives you identify to soc@cisecurity.org. Our SOC will either handle the issue directly, or escalate the issue to Akamai for assistance, if needed.
    – schroeder
    Sep 15 '21 at 22:38
  • I did see that, and is a remedy I hope our IPSEC team uses. However it seems they are willing to take their word for it and continue to allow the block. I am curious if the community has had direct experience with the technical issue or dealing with CIS. Thank you for your comments.
    – psl
    Sep 15 '21 at 22:44

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