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Files from Dariusz Tytko

SSH Username Enumeration

Posted Sep 1, 2024

Authored by Michal Sajdak, wvu, Qualys, Dariusz Tytko, kenkeiras | Site metasploit.com

This Metasploit module uses a malformed packet or timing attack to enumerate users on an OpenSSH server. The default action sends a malformed (corrupted) SSH_MSG_USERAUTH_REQUEST packet using public key authentication (must be enabled) to enumerate users. On some versions of OpenSSH under some configurations, OpenSSH will return a "permission denied" error for an invalid user faster than for a valid user, creating an opportunity for a timing attack to enumerate users. Testing note: invalid users were logged, while valid users were not. YMMV.

tags | exploit

advisories | CVE-2003-0190, CVE-2006-5229, CVE-2016-6210, CVE-2018-15473

SHA-256 | 1ffbd9886232ee7c1bbcfa4f8a71da9745e371936b0cb186036866d08b29bde5

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