Mod_security To Prevent Some Script

Jul 30, 2009

I try to use mod_security to prevent some script in some files,

imagine I want to block all scripts includes "test" in the body

so if code of script.php is:

HTML Code:
<html>
<p>test</p>
</html>

and someone run script.php , I want block running and show 406 error

now can you tell me how can I write this rule in mod_security 2 with apache 2?

I use SecRule RESPONSE_BODY "test" but its now working ...

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Mod_Security 2.5, Or 2.0?

Apr 21, 2008

I have been using mod_security 1.9.x since it first release on apache 1.3 and apache 2.0.x, rules are great and they work perfect with no issues at all with any php-mysql website. Do you recommend using mod_security 2.0 or 2.5 ? (I do know that 2.5 does not work with apache 1.3).

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Mod_security Won't Log Anything

Apr 19, 2008

using mod_security, but I believe that I have it installed correctly with some rules that should be generating entries in the security audit log. No matter what I do, I can't seem to get mod_security to generate any sort of log entries.

I am using version 2.1.7. I compiled it with no problems. In my httpd.conf file, I have the following relevant lines:

LoadFile /usr/lib/libxml2.so
LoadModule security2_module modules/mod_security2.so
Include conf/modsecurity/*.conf

I don't think there are any problems here, as I know it is running directives from the configuration file I edited. This is the file I'm working with:

modsecurity_crs_10_config.conf

Here are the relevant lines from the config file:

SecRuleEngine On
SecRequestBodyAccess On
SecResponseBodyAccess On
SecResponseBodyMimeType (null) text/html text/plain text/xml
SecResponseBodyLimit 524288
SecDefaultAction "phase:2,auditlog,log,pass,status:500"
SecAuditEngine On
SecAuditLogType Serial
SecAuditLog logs/modsec_audit.log
SecAuditLogParts "ABIFHZ"
SecRequestBodyInMemoryLimit 131072
SecDebugLog logs/modsec_debug.log
SecDebugLogLevel 3

I know that the config file is being read because when I start apache, the log files (modsec_audit.log and modsec_debug.log) are created. The problem is that the files are empty and remain empty no matter what I do. I have even tried setting permissions on the files to 777.

Here are a couple of rules I created in an attempt to generate log entries:

SecRule REQUEST_BODY "viagra"
SecRule REMOTE_ADDR "^1.1.3.4$" auditlog,phase:1,allow

I put these in the same config file mentioned above. As far as I understand, the first rule should examine the request body (which would include data in POST requests) for the word, "viagra". Since my default action is phase:2,auditlog,log,pass,status:500, such requests should end up in the audit log. However, when I use a form on my site to post the word "viagra", nothing is generated in the log file.

The second rule, as far as I understand, should generate a log entry any time the IP address 1.2.3.4 is sent in the request headers. Instead of 1.2.3.4, of course, I have put in my real IP address. However, when I visit my server and browse pages, nothing is logged. I assume that my requests should generate log entries since I match the IP address.

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Dec 1, 2007

I am currently running a few small websites that use a CMS. Two are Dragonfly and one is Joomla.

I am getting sporadic errors with both systems that, upon research, seem to be related to Apache and the mod_security module. I am getting the following error:

Code:
Not Acceptable

An appropriate representation of the requested resource /somefolder/index.php could not be found on this server.

Well, I'm no idiot (although some people may tend to disagree ) and after some searching, I found that this most likely points to an Apache error. Most solutions suggest to put the following in my .htacess file for the site:

Code:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>

It was noted that "SecFilterScanPOST Off" may or not be necessary. I have added the above to the .htaccess for each site (all 3 sites are subdomains) and have also added it to the .htaccess that is in the root folder for the site. Nothing has worked.

So my question is, is it possible that my webhost can override my .htaacess settings with their own? This is the only explanation that I can think of. But of course, I am no expert, which is why I turn to you good folks for help once again.

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Jul 27, 2008

I want to add some more rules to to mod_security, however I am unsure if some of them are already being used.

So would it cause any problems if there are duplicate rules for the time being till I can check through all the rules?

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Jul 23, 2007

I am having lots of problems installing mod_security on RH5 64 w/ Plesk.

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Any reason why everyone recommends to use version 1.94 of mod_security rather than the latest version available on www.modsecurity.org?

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Oct 2, 2007

I've got this:

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how to disable/exclude this uri in mentioned host from being catched by mod_security?

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Mar 29, 2007

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Jun 5, 2007

I installed modsecurity from Addone module in Cpanel

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Is there a particular settings add to the httpd.conf to prevent application phpshell or prevent upload it to the site?

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May 11, 2009

I tried using mod_security and mod_filter together. However, when I try to filter js files, I noticed that certain pages stop working, especially those using ajax.

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Jul 24, 2009

I installed Mod_Security on my Cent OS server today and having some problem in configurating it.

Problem -

I have added this module in 'httpd.conf' file

Code:
<IfModule mod_security.c>
SecFilterEngine On

SecServerSignature "Apache"
SecFilterCheckUnicodeEncoding Off
SecAuditEngine RelevantOnly
SecAuditLog logs/audit_log
SecFilterScanPOST On

SecFilterDefaultAction "deny,log,status:403"

SecFilterSelective REQUEST_METHOD "^POST$" chain
SecFilterSelective HTTP_Content-Length "^$"

SecFilterSelective HTTP_Transfer-Encoding "!^$"

SecFilterSelective ARG_PHPSESSID "!^[0-9a-z]*$"
SecFilterSelective COOKIE_PHPSESSID "!^[0-9a-z]*$"
SecFilter "../"

SecFilter "viewtopic.php?" chain
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SecFilterSelective THE_REQUEST "wget "
SecFilterSelective THE_REQUEST "lynx "
SecFilterSelective THE_REQUEST "scp "
SecFilterSelective THE_REQUEST "ftp "
SecFilterSelective THE_REQUEST "cvs "
SecFilterSelective THE_REQUEST "rcp "
SecFilterSelective THE_REQUEST "curl "
SecFilterSelective THE_REQUEST "telnet "
SecFilterSelective THE_REQUEST "ssh "
SecFilterSelective THE_REQUEST "echo "
SecFilterSelective THE_REQUEST "links -dump "
SecFilterSelective THE_REQUEST "links -dump-charset "
SecFilterSelective THE_REQUEST "links -dump-width "
SecFilterSelective THE_REQUEST "links http:// "
SecFilterSelective THE_REQUEST "links ftp:// "
SecFilterSelective THE_REQUEST "links -source "
SecFilterSelective THE_REQUEST "mkdir "
SecFilterSelective THE_REQUEST "cd /tmp "
SecFilterSelective THE_REQUEST "cd /var/tmp "
SecFilterSelective THE_REQUEST "cd /etc/httpd/proxy "
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SecFilterSelective THE_REQUEST "/../../ "
SecFilterSelective THE_REQUEST "&highlight=%2527%252E "
SecFilterSelective THE_REQUEST "changedir=%2Ftmp%2F.php "

# Very crude filters to prevent SQL injection attacks
SecFilter "delete[[:space:]]+from"
SecFilter "insert[[:space:]]+into"
SecFilter "select.+from"

# Weaker XSS protection but allows common HTML tags
SecFilter "<[[:space:]]*script"

# Prevent XSS atacks (HTML/Javascript injection)
SecFilter "<(.|n)+>"
</IfModule>

But my website is multi forum hosting and requires 'index.php' file to pass parameter to make it work.

Example -

[url]
[url]
[url]

So i had to delete below mention code from above module.

Code:
SecFilterSelective REQUEST_METHOD "^POST$" chain
SecFilterSelective HTTP_Content-Length "^$"

SecFilterSelective HTTP_Transfer-Encoding "!^$"

SecFilterSelective ARG_PHPSESSID "!^[0-9a-z]*$"
SecFilterSelective COOKIE_PHPSESSID "!^[0-9a-z]*$"
SecFilter "../"

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May 20, 2009

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Feb 25, 2008

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Dec 17, 2008

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Share your mod_sec 2 rules.

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May 7, 2008

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Jun 29, 2008

I've been having the hardest time getting mod_security on my new CentOS 5.2 64-bit box.

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Jun 17, 2008

I installed new cPanel server and enabled modsecurity inside
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Feb 16, 2008

Anyone care to share a good set of mod_security SecFilters?

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Dec 14, 2008

i have search this forum and google.but none of them can help me to instal it.

i have centos with direct admin.
first i login via ssh to my server
~
then i wget the latest ver an untar it in ~ and go to /modsecurity-apache_2.5.7 folder and then apache2/
and run:
./configure
make
make install
and config httpd.conf
thats it.

is it right or not and how can i test it that is it work fine or not

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Jan 16, 2008

I have been trying to install mod_security for the last few days and I can't seem to get it working. I'm with Rockmyweb hosting and for some reason although I have it listed in the httpd.conf, it is showing up in my vps control panel (under the security script) that it isn't installed.

Is there some way that I can test to see if it is actually installed or not?

Here is what is in my httpd.conf:

LoadFile /usr/lib64/libxml2.so
LoadModule security2_module /usr/lib/apache/mod_security2.so

<IfModule mod_security2.c>
Include conf/modsec/*.conf
</IfModule>

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May 10, 2008

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Jan 31, 2007

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I cannot find any thing in logs and there is no log written for mod_security?

here is my modsecurity.conf

Quote:

#If you want to scan the output, uncomment these
#SecFilterScanOutput On
#SecFilterOutputMimeTypes "(null) text/html text/plain"

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SecFilterForceByteRange 1 255

# Server masking is optional
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# You normally won't need debug logging
SecFilterDebugLevel 0
SecFilterDebugLog logs/modsec_debug_log

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#Application protection rules
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bash-2.05b# cat /etc/modsecurity.conf
<IfModule mod_security.c>

# Only inspect dynamic requests
# (YOU MUST TEST TO MAKE SURE IT WORKS AS EXPECTED)
#SecFilterEngine DynamicOnly

SecFilterEngine On

# Reject requests with status 500
SecFilterDefaultAction "deny,log,status:500"

# Some sane defaults
SecFilterScanPOST On
SecFilterCheckURLEncoding On
SecFilterCheckCookieFormat On
SecFilterCheckUnicodeEncoding Off
SecFilterNormalizeCookies On
# enable version 1 (RFC 2965) cookies
SecFilterCookieFormat 1

SecServerResponseToken Off

#If you want to scan the output, uncomment these
#SecFilterScanOutput On
#SecFilterOutputMimeTypes "(null) text/html text/plain"

# Accept almost all byte values
SecFilterForceByteRange 1 255

# Server masking is optional
#fake server banner - NOYB used - no one needs to know what we are using
SecServerSignature "NOYB"

#SecUploadDir /tmp
#SecUploadKeepFiles Off

# Only record the interesting stuff
SecAuditEngine RelevantOnly
SecAuditLog /var/log/audit_log

# You normally won't need debug logging
SecFilterDebugLevel 0
SecFilterDebugLog logs/modsec_debug_log

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#Remove any of these Include lines you do not use or have rules for.

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#These MUST come first!
Include /etc/modsecurity/exclude.conf

#Application protection rules
#Include /etc/modsecurity/rules.conf

#Comment spam rules
#Include /etc/modsecurity/blacklist.conf

#Bad hosts, bad proxies and other bad players
##Include /etc/modsecurity/blacklist2.conf

#Bad clients, known bogus useragents and other signs of malware
##Include /etc/modsecurity/useragents.conf

#Known bad software, rootkits and other malware
##Include /etc/modsecurity/rootkits.conf

#Signatures to prevent proxying through your server
#only rule these rules if your server is NOT a proxy
##Include /etc/modsecurity/proxy.conf

#Just in Time Patching for Vulnerable Applications
##Include /etc/modsecurity/jitp.conf

#Google Hacks signatures
##Include /etc/modsecurity/recons.conf

#Include /etc/modsecurity/

</IfModule>

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Quote:

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Code:
SecFilterScanPOST Off
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