MISP / MISP/misp-warninglists

Adjust X509 fingerprint Mozilla CA format

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Dominant language
Python
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18h 17m
Merged PRs (30d)
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Description

It came to my attention that the mozilla-ca list of known CA certificate fingerprints do not appear to use commas for separating the (hex-represented) bytes of the fingerprint.

This seems to be a problem to be as for example IDS like suricata provide a tls.fingerprint keyword that expects the fingerprint in that format.

Also any resource I was able to find use the same format, see this [1] as an example

I'm wondering what would be the best approach in this case, I see two alternatives:

  1. adjust the list to hex format (for example adding the same entries twice);
  2. create another list with the hex format

Looking forward for your comments
[1] https://www.netlock.hu/USEREN/html/cacrl.html

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the mozilla-ca warning list and inspect how its certificate fingerprints are currently represented. Compare the entries with the Suricata tls.fingerprint format and the referenced CA list; the work is done when the chosen approach provides a consistent hex representation without ambiguity.

Written by the indexing model from the issue text.

Assessment

Domain
security
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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