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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(Ubuntu Issues Fix) OpenSSH Authentication Attempt Processing Lets Remote Users Determine Valid Usernames on the Target System
SecurityTracker Alert ID:  1042043
SecurityTracker URL:  http://securitytracker.com/id/1042043
CVE Reference:   CVE-2018-15473   (Links to External Site)
Date:  Nov 7 2018
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenSSH. A remote user can determine valid usernames on the target system.

The system responds differently to valid and invalid authentication attempts. A remote user can send specially crafted requests to determine valid usernames on the target system.

Impact:   A remote user can determine valid usernames on the target system.
Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://usn.ubuntu.com/usn/usn-3809-1

Vendor URL:  usn.ubuntu.com/usn/usn-3809-1 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  14.04 LTS, 16.04 LTS, 18.04 LTS

Message History:   This archive entry is a follow-up to the message listed below.
Aug 15 2018 OpenSSH Authentication Attempt Processing Lets Remote Users Determine Valid Usernames on the Target System



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