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Family: Web Servers --> Category: infos

Apache Remote Username Enumeration Vulnerability Vulnerability Scan

Vulnerability Scan Summary
Checks for the error codes returned by Apache when requesting a non-existant user name

Detailed Explanation for this Vulnerability Test

Synopsis :

The remote Apache server can be used to guess the existence of a given
user name on the remote host.

Description :

When configured with the 'UserDir' option, requests to URLs containing
a tilde followed by a username will redirect the user to a given
subdirectory in the user home.

For instance, by default, requesting /~root/ displays the HTML
contents from /root/public_html/.

If the username requested does not exist, then Apache will reply with
a different error code. Therefore, a possible hacker may exploit this
vulnerability to guess the existence of a given user name on the remote

Solution :

In httpd.conf, set the 'UserDir' to 'disabled'.

Threat Level:

Low / CVSS Base Score : 2

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