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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(IBM Issues Fix for IBM AIX) OpenSSH Authentication Attempt Processing Lets Remote Users Determine Valid Usernames on the Target System
SecurityTracker Alert ID:  1041943
SecurityTracker URL:  http://securitytracker.com/id/1041943
CVE Reference:   CVE-2018-15473   (Links to External Site)
Date:  Oct 24 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:   IBM has issued a fix for IBM AIX.

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssh_advisory12.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssh_advisory12.asc (Links to External Site)
Cause:   Access control 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.
Aug 15 2018 OpenSSH Authentication Attempt Processing Lets Remote Users Determine Valid Usernames on the Target System



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