mod_anti_tamper – Anti Tamper Module for Apache 2.x

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What Is Mod AntiTamper (AT)

AntiTamper is an Apache 2.x module that could be used to prevent some sort of url and cookie tampering.

Specifically, AT could stop a lot of those malicious bots that take advantage from search engines. Moreover, attack techniques like HTTP Response Splitting and session hijacking/fixation will be mitigated.

Is important to notice that mod_anti_tamper is not an alternative to mod_security, which is more exaustive and useful for all web situations. AT could be a complement to mod_security.


– What is HMAC

HMAC is a validation algorithm to check the integrity of informations coupled with a secret password (more here).

AT will automatically generate a password and will save it in a ‘safe’ place (root owner with 600 mode).

How AT Works

AT is composed by two primary active components.

1. A filter for url links integrity check.
2. A filter for cookie integrity check.

Download mod_anti_tamper here:


Or read more here.

Posted in: Countermeasures, Security Software, Web Hacking

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3 Responses to mod_anti_tamper – Anti Tamper Module for Apache 2.x

  1. goodpeople January 26, 2008 at 12:59 am #

    Sorry that I didn’t comment on this one earlier. I’m kinda busy these days..

    This is a very usefull feature. I will definately introduce this in my own webserver.

  2. Fran January 29, 2008 at 4:59 pm #

    2005!! it’s obsolete!

  3. eM3rC February 7, 2008 at 5:49 am #

    All servers deserve this although Fran brings up a good point of it being kind of dated…