[Bro-Dev] [JIRA] (BIT-1314) Detect "quantum insert" type of attacks

[Jon Siwek (JIRA)]

    [ https://bro-tracker.atlassian.net/browse/BIT-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19600#comment-19600 ] 

Jon Siwek commented on BIT-1314:
--------------------------------

Handling the "rexmit_inconsistency" event and comparing the mismatched content might be a way to do what you want.

https://www.bro.org/sphinx/scripts/base/bif/event.bif.bro.html?highlight=rexmit_inconsistency#id-rexmit_inconsistency

> Detect "quantum insert" type of attacks
> ---------------------------------------
>
>                 Key: BIT-1314
>                 URL: https://bro-tracker.atlassian.net/browse/BIT-1314
>             Project: Bro Issue Tracker
>          Issue Type: New Feature
>          Components: Bro
>            Reporter: David André
>
> Add detection for "quantum insert" type of attacks. Since the leaked information is classified, I will try to explain in unclassified form what it is about.
> The idea is that you have a passive adversary that sniff your TCP sequence numbers and inject its malicious payload faster than the real server.
> One of the leaked documents mentions as an alerting mechanism to detect duplicate TCP sequence numbers from same source, where at least 10% of the beginning of the content of the two packets differs.



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