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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(IBM Issues Fix for IBM AIX) OpenSSH Lets Remote Users Determine Valid Usernames on the Target System
SecurityTracker Alert ID:  1036898
SecurityTracker URL:  http://securitytracker.com/id/1036898
CVE Reference:   CVE-2016-6210   (Links to External Site)
Date:  Sep 24 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:   IBM has issued a fix for IBM AIX.

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssh_advisory9.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssh_advisory9.asc (Links to External Site)
Cause:   State error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.3, 6.1, 7.1, 7.2

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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