Your message dated Sun, 25 Mar 2018 16:59:37 +0200
with message-id <[email protected]>
and subject line Not a bug
has caused the Debian Bug report #893962,
regarding Modsecurity ignores phase 2 rules in Debian Stretch
to be marked as done.

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893962: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=893962
Debian Bug Tracking System
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--- Begin Message ---
Package: libapache2-mod-security2
Version: 2.9.1-2

Modsecurity in stretch seems to ignore rules in phase 2.

I've defined the following test case:

<IfModule security2_module>

SecResponseBodyAccess on

SecRuleEngine On

# Does not work
SecRule ARGS "/proc/(.*/)?self/(.*/)?environ" 
"phase:2,id:1420001,t:none,log,deny"

# Works
SecRule QUERY_STRING "^-[sdcr].*" 
"phase:1,id:1420701,t:none,t:urlDecodeUni,t:removeWhitespace,deny,log,msg:'Potential
 PHP-CGI Exploit Attempt',logdata:%{matched_var}"

SecRuleEngine On

</IfModule>

The rule 1420701 triggers correctly (as shown via 
curl   "http://192.168.178.70/?-s";
)

However the rule 1420001 doesn't trigger (as shown by
curl   "http://192.168.178.70/?a=/proc/self/environ";
)

On an older Linux (Ubuntu 14.04 with modsecurity 2.7.7-2) both rules 
work all right, so this (apparently) isn't a case of ARGS not working 
"by principle" in phase 2.

Unfortunately, popular open rule collections such as CRS use phase 2 a 
lot (... and for instance RFI is not triggered by curl 
"http://192.168.178.70/?a=http://www.somewhere.com"; when CRS is 
installed, but it is triggered correctly with CRS on the older Ubuntu)

So just changing phase 2 into phase 1 is not an option, as this would
require changing half of CRS, and risking breaking something else.

Any ideas how to fix this?

Thanks,

Alain

--- End Message ---
--- Begin Message ---
Closing.

-- 
Alberto Gonzalez Iniesta    | Formación, consultoría y soporte técnico
mailto/sip: [email protected] | en GNU/Linux y software libre
Encrypted mail preferred    | http://inittab.com

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