Mod_security Functionality Bypass Through .htaccess Issue
May 5, 2007
I accidently found that it could be available to de-activate mod_security in a certain directory by using a .htaccess like that...
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
I believe it's something related to the "AllowOverride" directive from apache but im not exactly sure, the available arguments for this directive are "AuthConfig, FileInfo, Indexes, Limit, Options", I've tried hardly to find a way to not to disable the usage of .htaccess files and keep it's functionality but also to prevent it from being able to modify through it the functionality of mod_security.
I'm sure Anyone here could help me in this issue as it's a big pain for any server running apache in a shared vhosting environment.
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Nov 7, 2007
Im considering alternatives to Apache web server for high traffic servers.
I already installed lighttpd + fastCGI (which is great!), integrated php5 and mysql5 without any problems.. After searching over the net i can see that there are lot of problems to have .htaccess files working in the same way as in Apache 1.3/2.x .
The solutions I've seen for this require almost a complere re-write of the .htaccess rules and even the app code in some cases, i mean, this is not good. Have anyone configured lighttpd to work with generic .htaccess files ? any guides please?
Also another important thing on a webservers is the security, apache is able to handle mod_security (a must in web server security I think), but i do not see any documentation on how to migrate mod_sec to lighttpd, any ideas about this?
Im testing this on Debian + PHP5 and MySQL 5 with latest lighttpd package.
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Jul 15, 2008
Considering a web site could be completely useless without its web forms working as expected, and the uptime reports do not verify them at all, I would like to know if you people, consider it important.
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Aug 8, 2007
What popular hosts allow full mod_rewrite functionality via an .htaccess file?
Particularly, something like this:
Code:
RewriteRule ^avatars/([^.]*.(jpg|jpeg|png|gif|swf))$ imghost.php?fn=$1&dir=avatars [NC,L]
Hosts that allow it:
- Dreamhost
- Hostgator
Hosts that don't allow it:
- Godaddy
- 1&1 / 1and1
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Dec 10, 2007
What this does is amongst others is to add "SHOW USER_STATISTICS"
statement do MySQL. What this does is keep statistics on which users on your mysql machine is spending the most time processing queries.
It is also mentioned here: [url]
If you believe this functionality could be important to our industry you are more than welcome to vote for this or add comments to the following feature request:
[url]
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Aug 24, 2007
I have put an Access database inside an access_db folder on Godaddy and written some .asp pages that query it. I am trying to make sure that I take necessary precautions against hackers reading or even writing to the database. Maybe someone can give some remarks about whether any of these concerns are realistic, and if so, why and what I could do about it?
1) Could someone somehow navigate directly to the database and read or write to it (the access_db folder seems to have no read/write permissions as set by default by Godaddy, but how secure is that?)
2) I permit entry through use of a a userid and password that are looked up in an mdb in the same folder (not listed in the html itself). If there’s a match, I store the userid as a session cookie. Then, to visit any other pages, each page first checks to see if the cookie is empty before proceeding. Is it possible for someone to set the cookie themselves and thus break through (can a cookie be set manually?) If so, would it help if I mandated that the cookie be set to something specific (right now it just has to be non-blank) or can they find out what the cookie should be set to as well?
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Apr 10, 2014
I'm trying to get exception from auth (.htpasswd ) for one specific URL, but seems, that it does not work with my Rewriting rules. Disabling RewriteEngine solving auth problem. My .htaccess:
Code:
SetEnv APPLICATION_ENV development
# Rewrite
RewriteEngine On
RewriteBase /
# ZEND
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
[Code] .....
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Jul 23, 2009
My blog is set up to display in the root of my domain, although the files on the server sit within their own folder:
i.e
Server files
Public_html/wordpressfiles/
Broswer displays
www . mydomain . com/
(disaplys pages from /wordpressfiles)
The problem I have is that I can't access individual directories within the root, unrelated to wordpress.
e.g
I have
Public_html/folder2/...
Setup on the server, but if I enter the path in my browser:
www . mydomain . com/folder2
wordpress thinks I want to access:
www . mydomain . com/wordpress/folder2
...which doesn't exist.
How can I re-gain access to folders in the root, without wordpress interfering?
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Feb 6, 2008
Recently, some of our Linux/cPanel servers got hacked (not rooted) by using the following code (method)
#!/usr/bin/perl
symlink ("/home/USER/config.php","/home/USER2/test.txt");
The hacker just execute the perl file , and then he called the "test.txt" file through internet explorer , and its done , he can read the file easily !
We tried to :
1- run php as CGI module.
2- run SUPHP module.
3- run php as apache module.
4- enable open_basedir and safe_mode.
But the hacker still can bypass the system!
the only solution is to disable /usr/bin/perl , chmoded it to 700 . but thats caused a broken cpanel!
as it requires it to be at 755 for proper operation, since it is used by customers as well when it suexec into the user when they log into cPanel. and so we cannot change it to that setting (700), since it breaks the entire system.
So is there any way to stop the "symlink" perl function?
any way to stop this attack method?
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Oct 12, 2007
I am running on;
Plesk versionpsa v8.0.1_build80060613.20 os_CentOS 4.2
Operating systemLinux 2.6.9-023stab033.6-smp
License key numberPLSK.00170782.0006
I need to be able to access cgi between vhost domains. In particular one frequently updated file located 'centrally' in the cgi-bin of one of the vhost domain.
I would like to be able to have other vhost domains be able to access this file but suexec won't let that happen. I have searched around and tried to following;
Created vhost.conf file in the conf directory of one of the domains.
The vhost.conf file contained (with no #):
# <IfModule mod_suexec.c>
# SuexecUserGroup userid psacln
# </IfModule>
I ran;
/usr/local/psa/admin/bin/websrvmng -u --vhost-name=<domain name>
Then reboot.
The result was all the vhosts stopped working. I reset the websvrmng, things returned to normal.
Then I tried updating the httpd.include file adding (with no #);
# <IfModule mod_suexec.c>
# SuexecUserGroup userid psacln
# </IfModule>
Then reboot.
The result was the same, all vhosts stopped working.
Does anyone have an idea how I can achieve this? I know I can disable suexec all together but that wreaked a little havoc with the cgi app when I tried that.
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Feb 20, 2013
I just setup an intranet wiki running apache2.2 on ubuntu 12.04. The server currently requires two-way certificate authentication (i.e. a server cert AND client certs).In <VirtualHost *:80>, Redirect permanent / https://<intranetSite>
Everything works dandy, except now that I'd like to find a way to bypass the client cert check for localhost so that I can run some maintenance scripts via cron on the server. Or perhaps it's possible to bypass SSL entirely, just for localhost?
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Jul 13, 2008
Recently my site was defaced, (i own a dedicated server), my server was not touched, but one of the applications I used on the site was exploited to gain access to it.
I have noticed 4 or 5 c99 shells in different locations on my ftp. The site is back online, but it's definitely possible that they have one of these hidden somewhere and that they'll just do it again. I am using cent os 5
How can I easily search for these on my box? Can I disable their functionality? is there setting I can use in htaccess or something to make my website safer? I visited one of the scripts, and it said SAFEMODE OFF, how can I at least enable safemode?
I don't know much of anything about linux, but I am running cpanel and WHM. I have a guy who manages my box but he is hard to get a hold of sometimes, and I'd like to take care of this ASAP!
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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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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.
mainly related to apr0, subversion, and the headers.
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:
mod_security: Access denied with code 406. Error normalising REQUEST_URI: Invalid URL encoding detected: invalid characters used [hostname "www.mydomain.com"] [uri "/search/include/js_suggest/suggest.php?type=query&q=%u062E%u0636%u0631%u0627"]
how to disable/exclude this uri in mentioned host from being catched by mod_security?
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Mar 29, 2007
how many people are actually using mod_security 2 instead of 1?
And why did you choose the version you did?
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Jun 5, 2007
I installed modsecurity from Addone module in Cpanel
When I try to apply phpshell woork good without a mistakes and I can do anything despite of the presence of protection modsecurity and disable_functions in php.ini.
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]*$"
SecFilter "../"
SecFilter "viewtopic.php?" chain
SecFilter "chr(([0-9]{1,3}))" "deny,log"
SecFilterSelective THE_REQUEST "wget "
SecFilterSelective THE_REQUEST "lynx "
SecFilterSelective THE_REQUEST "scp "
SecFilterSelective THE_REQUEST "ftp "
SecFilterSelective THE_REQUEST "cvs "
SecFilterSelective THE_REQUEST "rcp "
SecFilterSelective THE_REQUEST "curl "
SecFilterSelective THE_REQUEST "telnet "
SecFilterSelective THE_REQUEST "ssh "
SecFilterSelective THE_REQUEST "echo "
SecFilterSelective THE_REQUEST "links -dump "
SecFilterSelective THE_REQUEST "links -dump-charset "
SecFilterSelective THE_REQUEST "links -dump-width "
SecFilterSelective THE_REQUEST "links http:// "
SecFilterSelective THE_REQUEST "links ftp:// "
SecFilterSelective THE_REQUEST "links -source "
SecFilterSelective THE_REQUEST "mkdir "
SecFilterSelective THE_REQUEST "cd /tmp "
SecFilterSelective THE_REQUEST "cd /var/tmp "
SecFilterSelective THE_REQUEST "cd /etc/httpd/proxy "
SecFilterSelective THE_REQUEST "/config.php?v=1&DIR "
SecFilterSelective THE_REQUEST "/../../ "
SecFilterSelective THE_REQUEST "&highlight=%2527%252E "
SecFilterSelective THE_REQUEST "changedir=%2Ftmp%2F.php "
# Very crude filters to prevent SQL injection attacks
SecFilter "delete[[:space:]]+from"
SecFilter "insert[[:space:]]+into"
SecFilter "select.+from"
# Weaker XSS protection but allows common HTML tags
SecFilter "<[[:space:]]*script"
# Prevent XSS atacks (HTML/Javascript injection)
SecFilter "<(.|n)+>"
</IfModule>
But my website is multi forum hosting and requires 'index.php' file to pass parameter to make it work.
Example -
[url]
[url]
[url]
So i had to delete below mention code from above module.
Code:
SecFilterSelective REQUEST_METHOD "^POST$" 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 25, 2009
Is it possible to disable a particular mod_security rule for particular directory or the rules are global?
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Aug 15, 2008
I just installed mod_security via WHM, and want to know what rule should I enter to prevent some URLs from being opened.
For example, if URL contains word "abc" (like domain.com/some_folder/abc/file.php), it should not be opened.
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May 20, 2009
I have installed a new server with debian lenny 5, ISPConfig 3.0.1.1 and the newest mod_security and implemented the default rules.
I deactivated the rule detecting IP in pageheaders.
Then I got another problem. Some actions of ISPConfig are detected as "remote file access attempt", severity "critical", tag "web attack/file injection" data "/etc/"
detected by rule file crs_40 line 114, id 950005
question: how do I authorize ISPConfig and only ISPConfig to perform such requests on the server?
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Jun 4, 2008
how to set the rules of MOD_Security.
Another question for professionals:
Q: What are the best rules to secure my server? I'd appreciate if you managed to attach these rules to your replies. // FYI, I host VBulletin portals.
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Dec 24, 2008
Trying to use an RBL with ModSecurity but this matches everything whether listed or not.
SecRule REMOTE_ADDR "@rbl bb.barracudacentral.org" "log,deny,msg:'POST RBL Comment Spammer'"
What I would like to do is do an RBL lookup and any POST operations.
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