Description
Apache on Red Hat Linux with with the UserDir directive enabled generates different error codes when a username exists and there is no public_html directory and when the username does not exist, which could allow remote attackers to determine valid usernames on the server.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
-
Apache "mod_userdir" User Enumeration
auxiliary/scanner/http/apache_userdir_enum
Exploit-DB 1
- RedHat Linux 7.0 Apache - Remote Username Enumeration EDB-21112 · remote · Sep 12, 2001 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 3335 vdb-entry
- 20010912 Is there user Anna at your host ? mailing-list
- 20000707 Re: your mail mailing-list
- 20000707 (no subject) mailing-list
- linux-apache-username-exists(7129) vdb-entry
- 20000707 Re: apache and 404/404 status codes mailing-list