Re: [Mod-security-developers] Request body processed when blocking in phase 1

[Marc S. <mar...@ap...>]

I reproduced this behaviour even in Windows with everything compiled together

Marc

On 11-03-19 14:22, Felipe Costa wrote:
I have seemed the behavior that you have described in servers with APR version mismatch. Other than that, I did not manage to emulate such behavior.


Br.,

Felipe "Zimmerle" Costa

Security Researcher, Lead Developer ModSecurity

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________________________________
From: Marc Stern <mar...@ap...><mailto:mar...@ap...>
Sent: Thursday, February 28, 2019 11:49 AM
To: mod...@li...<mailto:mod...@li...>
Subject: [Mod-security-developers] Request body processed when blocking in phase 1

I'm running v 2.9.3 built with --enable-request-early to have phase 1
rules running before receiving the body.
If I sent a huge body, the request is well blocked in phase 1 but
there's a huge processing time (10 min for 1.5 MB) on a strong machine
after hook_insert_error_filter()
Can somebody explain me what could happen and/or how to troubleshoot that.
Isn't the phase 1 rule (with --enable-request-early) supposed to run
before the request body is received by httpd?

Here's the debug log (max level):
[28/Feb/2019:14:27:50 +0100] [...][4] Ctl: Set requestBodyAccess to 0.
[...]
[28/Feb/2019:14:27:50 +0100] [...][4] Access denied with code 404 (phase
1). [...]
[28/Feb/2019:14:27:50 +0100] [...][4] Hook insert_error_filter: Adding
output filter (r 248029de120).
[28/Feb/2019:14:37:20 +0100] [...][9] Output filter: Receiving output (f
24802c82a38, r 248029de120).
[28/Feb/2019:14:37:20 +0100] [...][4] Skipping phase 3 as request was
already intercepted.

error log:
[Thu Feb 28 14:27:50.864432 2019] [core:trace5] [pid 6060:tid 2008]
protocol.c(614): [client ...] Request received from client: POST /...
HTTP/1.1
[Thu Feb 28 14:37:20.529622 2019] [headers:debug] [pid 6060:tid 2008]
mod_headers.c(908): AH01503: headers: ap_headers_error_filter()

Marc

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