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Feature #2281

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tcp stream: simpler IDS handling of overlap evasions

Added by Victor Julien over 6 years ago. Updated over 4 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
Actions #1

Updated by Victor Julien over 6 years ago

  • Related to Task #2309: SuriCon 2017 brainstorm added
Actions #2

Updated by Victor Julien over 4 years ago

This mode of operation would look quite a bit like the inline mode for app-layer. For detection it would be a bit more involved.

Actions #3

Updated by Victor Julien over 4 years ago

  • Related to Task #3288: Suricon 2019 brainstorm added
Actions #4

Updated by Jason Ish over 1 year ago

  • Related to Bug #3480: EVE JSON - Incorrect Packet Logged added
Actions

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