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Bug #5064

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frames: duplicate alerts when no flow direction provided

Added by Jason Ish 10 months ago. Updated 10 months ago.

Status:
New
Priority:
Normal
Assignee:
Target version:
Affected Versions:
Effort:
Difficulty:
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Description

Seen with the PCAP from https://github.com/OISF/suricata-verify/pull/711.

A rule like:

alert sip any any -> any any (flow:to_client; frame:pdu; content:"REGISTER sip"; sid:1;)

will alert once as expected as the content REGISTER sip is only seen once in the pcap in the to_client direction.

However the rule:

alert sip any any -> any any (frame:pdu; content:"REGISTER sip"; sid:1;)

will create 2 identical alerts, but should probably only create one alert.

This does not appear to be limited to SIP, as I'm seeing it in my work-in-progress DNS frame support.

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