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Feature #2281

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tcp stream: simpler IDS handling of overlap evasions

Added by Victor Julien almost 7 years ago. Updated almost 5 years ago.

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Description

Currently we act only on 'ACKed' data so we can use target based reassembly to prevent evasions. This leads to 2 issues:

1. detection/logging always a bit delayed, which is worse in case of sudden flow cut offs. Then handling waits for flow timeout.
2. nobody ever sets the OS/ip mapping.

The idea of this ticket is to act on non-ACK'd data right away, and simply issue a warning (event) if data is different.


Related issues 3 (3 open0 closed)

Related to Suricata - Task #2309: SuriCon 2017 brainstormAssignedVictor JulienActions
Related to Suricata - Task #3288: Suricon 2019 brainstormAssignedVictor JulienActions
Related to Suricata - Bug #3480: EVE JSON - Incorrect Packet LoggedNewOISF DevActions
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