Version Disclosure (mod_ssl)

Summary#

Invicti identified that the target web server is disclosing the mod_ssl version in its HTTP response. This information might help an attacker gain a greater understanding of the systems in use and potentially develop further attacks targeted at the specific version of mod_ssl.

Impact#

An attacker might use the disclosed information to harvest specific security vulnerabilities for the version identified.

Remediation#

Configure your web server to prevent information leakage from the SERVER header of its HTTP response. To apply configuration, first make sure you have headers_module installed.

Add the following line to load the headers module in the httpd.conf

LoadModule headers_module modules/mod_headers.so

After headers_module is loaded, edit or include the following lines of config in the httpd.conf

ServerSignature Off
ServerTokens Prod

<IfModule mod_headers.c>
    Header unset Server
</IfModule>

Remedy References#

Apache Module mod_headers

Classifications#

CWE-205, WASC-13, OWASP 2017-A6, ISO27001-A.18.1.3, HIPAA-164.306(a), 164.308(a), OWASP 2013-A5, CAPEC-170

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Version Disclosure (mod_ssl)

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