Project

General

Profile

Actions
Copy link

Bug #4286

open

detect: FN due to setup failure with http_cookie after isdataat

Added by Jason Taylor almost 5 years ago. Updated 10 days ago.

Status:
Feedback
Priority:
Normal
Assignee:
Community Ticket
Target version:
TBD
Affected Versions:
4.1.10
Effort:
Difficulty:
Label:
Needs Suricata-Verify test

Description

Given a sample of traffic such as:

GET /somestuff HTTP/1.1
Accept: */*
Cookie: id=234524dst35e
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0000; Windows NT 5.1; SV1)
Host: google.com

We would expect the following to work:

alert http $HOME_NET any -> $EXTERNAL_NET any (flow:established,to_server; content:"id="; depth:3; isdataat:!13,relative; http_cookie;)

However, the rule does not fire as expected in any of the 4.0.x, 4.1.x, 5.x versions I tested on.

If we switch the rule to use http.cookie, the rule works as expected.

Subtasks 1 (1 open — 0 closed)

Task #5483: SV tests to demonstrate false negative behavior for negated isdataat with http_cookie keyword (bug 4286)In ReviewVictor JulienActions

Related issues 2 (2 open — 0 closed)

Related to Suricata - Documentation #5484: userguide: explain content modifiers usage with regards to position usage in the ruleNewOISF DevActions
Related to Suricata - Bug #1926: rule parsing: wrong content checked for fast_pattern (snort compatibility)FeedbackOISF DevActions
Actions
Copy link

Also available in: Atom PDF