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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(Ubuntu Issues Fix) OpenSSH Lets Remote Users Determine Valid Usernames on the Target System
SecurityTracker Alert ID:  1036622
SecurityTracker URL:  http://securitytracker.com/id/1036622
CVE Reference:   CVE-2016-6210   (Links to External Site)
Date:  Aug 15 2016
Impact:   Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 7.2p2; possibly prior versions
Description:   A vulnerability was reported in OpenSSH. A remote user can determine valid usernames on the target system.

A remote user can send a specially crafted request with a large password (approximately 10,000 characters) to the target ssh daemon to determine valid usernames on the target system. On systems where a valid user's password has been hashed with SHA256/SHA512, the response time will be shorter for a non-existent username than for a valid username.

Eddie Harari reported this vulnerability.

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

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-3061-1

Vendor URL:  www.ubuntu.com/usn/usn-3061-1 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 16.04 LTS

Message History:   This archive entry is a follow-up to the message listed below.
Jul 16 2016 OpenSSH Lets Remote Users Determine Valid Usernames on the Target System



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