如何在 .htaccess 文件中禁用 mod_security？

Question

How can we disable mod_security by using .htaccess file on Apache server?

I am using WordPress on my personal domain and posting a post which content has some code block and as per my hosting provider said mod_security gives an error and my IP has gone into firewall because of mod_security .

So I want to disable mod_security by using .htaccess file.

Answer 1

It is possible to do this, but most likely your host implemented mod_security for a reason. Be sure they approve of you disabling it for your own site.

That said, this should do it;

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

Answer 2

On some servers and web hosts, it's possible to disable ModSecurity via .htaccess , but be aware that you can only switch it on or off, you can't disable individual rules.

But a good practice that still keeps your site secure is to disable it only on specific URLs, rather than your entire site. You can specify which URLs to match via the regex in the <If> statement below...

### DISABLE mod_security firewall
### Some rules are currently too strict and are blocking legitimate users
### We only disable it for URLs that contain the regex below
### The regex below should be placed between "m#" and "#" 
### (this syntax is required when the string contains forward slashes)
<IfModule mod_security.c>
  <If "%{REQUEST_URI} =~ m#/admin/#">
    SecFilterEngine Off
    SecFilterScanPOST Off
  </If>
</IfModule>

Answer 3

When the above solution doesn't work try this:

<IfModule mod_security.c>
  SecRuleEngine Off
  SecFilterInheritance Off
  SecFilterEngine Off
  SecFilterScanPOST Off
  SecRuleRemoveById 300015 3000016 3000017
</IfModule>

Answer 4

Just to update this question for mod_security 2.7.0+ - they turned off the ability to mitigate modsec via htaccess unless you compile it with the --enable-htaccess-config flag. Most hosts do not use this compiler option since it allows too lax security. Instead, vhosts in httpd.conf are your go-to option for controlling modsec.

Even if you do compile modsec with htaccess mitigation, there are less directives available. SecRuleEngine can no longer be used there for example. Here is a list that is available to use by default in htaccess if allowed (keep in mind a host may further limit this list with AllowOverride ):

    - SecAction
    - SecRule

    - SecRuleRemoveByMsg
    - SecRuleRemoveByTag
    - SecRuleRemoveById

    - SecRuleUpdateActionById
    - SecRuleUpdateTargetById
    - SecRuleUpdateTargetByTag
    - SecRuleUpdateTargetByMsg

More info on the official modsec wiki

As an additional note for 2.x users: the IfModule should now look for mod_security2.c instead of the older mod_security.c

Answer 5

With some web hosts including NameCheap , it's not possible to disable ModSecurity using .htaccess . The only option is to contact tech support and ask them to alter the configuration for you.

Answer 6

In .htaccess file at site root directory edit following line:

 <ifmodule mod_security.c> SecFilterEngine Off SecFilterScanPOST Off </ifmodule> <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME}.-f RewriteCond %{REQUEST_FILENAME}.-d RewriteRule . /index.php [L] </IfModule>

Just keep the mod_security rules like SecFilterEngine and parts apart from each other. Its works for apache server

Answer 7

For anyone that simply are looking to bypass the ERROR page to display the content on shared hosting. You might wanna try and use redirect in .htaccess file. If it is say 406 error, on UnoEuro it didn't seem to work simply deactivating the security. So I used this instead:

ErrorDocument 406 /

Then you can always change the error status using PHP. But be aware that in my case doing so means I am opening a door to SQL injections as I am bypassing WAF. So you will need to make sure that you either have your own security measures or enable the security again asap.