How to Hide Apache Version Number and Other Sensitive Info?

Cybersecurity is a growing concern for businesses and individuals alike. One way to protect yourself against potential attacks is by hiding sensitive information such as your Apache version number. The Apache version number can be used by attackers to identify vulnerabilities in your system and launch targeted attacks.

Additionally, default Apache settings may reveal sensitive information such as server operating system, installed modules, or applications, which can make it easier for hackers to gain unauthorized access. By hiding the Apache version number and other sensitive information, you can reduce the risk of cyberattacks.

Understanding Apache Version Number and Sensitive Information

What is Apache Version Number?

Apache version number is a string of numbers and letters that indicates the version of the Apache web server software running on a server. This information can be easily obtained by an attacker by simply sending a request to the server asking for this information through HTTP headers.

Why is it Sensitive?

Apache version number can be used by attackers to identify vulnerabilities in old or outdated versions of the software. For instance, if an attacker knows that a particular version has a known vulnerability, they can use that knowledge to exploit that vulnerability and gain unauthorized access to the server. Therefore, it's crucial to hide this information from prying eyes as much as possible.

Other Sensitive Information Revealed by Default Apache Settings

Apart from Apache version number, there are other pieces of sensitive information that can be revealed by default Apache settings. This includes details such as server operating system type and version, installed modules, and directory listing status.

The operating system type and version details can be used by attackers to identify specific exploits that could work against that particular OS. Knowing which modules are installed on the server can also provide attackers with valuable insight into how they might attack your server.

Methods for Hiding Apache Version Number and Other Sensitive Information

Editing httpd.conf File

One of the most common and straightforward methods for hiding Apache version number and other sensitive information is by editing the httpd.conf file. This file contains all the configuration settings for Apache, including those related to security and information disclosure.

Follow these steps to edit the httpd.conf file

• Locate the httpd.conf file on your server. The location may differ depending on your server setup, but it is usually located in /etc/httpd/conf or /usr/local/apache2/conf.

• Open the httpd.conf file using a text editor such as nano or vi.

• Search for ServerTokens in the file. This directive specifies what information about Apache should be included in HTTP response headers.

• Change the value associated with ServerTokens from Full to Prod. This will remove detailed version number information from HTTP response headers.

• Optionally, change the value associated with ServerSignature from On to Off. This prevents Apache from appending server signature details at the end of error pages.

• Save your changes and restart Apache using commands like service apache2 restart or systemctl restart httpd.service.

ServerTokens Prod
ServerSignature Off

Using ServerTokens Directive

The ServerTokens directive can be configured with different values depending on what information you want to reveal in HTTP response headers

Using Third-Party Modules

Another way to hide sensitive information is by using third-party modules that provide extra security features. These modules can be installed and configured on your server without requiring major changes to your existing setup.

Popular security modules include

• ModSecurity A web application firewall that provides protection against various attacks such as SQL injection and cross-site scripting. It can also be configured to remove sensitive information from HTTP response headers.

• mod_evasive Provides protection against DoS (Denial of Service) attacks by limiting the number of requests a client can make within a certain time frame.

• mod_headers Allows you to modify HTTP request and response headers according to various rules. This can be useful for removing sensitive information or adding custom headers for security purposes.

Additional Security Measures

Enabling SSL/TLS Encryption

While hiding Apache version information is important, it's also essential to protect the information transmitted between the server and clients. SSL/TLS encryption encrypts all data that is transmitted between the client and server, making it unreadable to anyone who intercepts it.

To enable SSL/TLS encryption, you'll need to obtain an SSL/TLS certificate from a trusted Certificate Authority (CA). The certificate validates your domain and creates an encrypted connection between your server and clients.

Implementing Access Controls

Another security layer is implementing access controls that restrict access to certain files or directories based on user credentials or IP addresses. By implementing access controls, you can ensure that only authorized users can access sensitive information.

Common methods for implementing access controls include using .htaccess files, which allow you to specify authorization rules for specific directories or files, and configuring directory-level permissions in your main Apache configuration.

<Directory "/var/www/html/admin">
    Require ip 192.168.1.0/24
    Require valid-user
</Directory>

Conclusion

Hiding Apache version numbers and other sensitive information is crucial for maintaining server security. By configuring ServerTokens and ServerSignature directives, using security modules, and implementing additional measures like SSL/TLS encryption and access controls, you can significantly reduce your server's attack surface and protect against targeted exploits.