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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(OpenBSD Issues Fix) OpenSSH Flaws Let Remote Authenticated Users Obtain Potentially Sensitive Information From Client Memory
SecurityTracker Alert ID:  1034742
SecurityTracker URL:  http://securitytracker.com/id/1034742
CVE Reference:   CVE-2016-0777, CVE-2016-0778, CVE-2016-1907   (Links to External Site)
Date:  Jan 20 2016
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.4 - 7.1
Description:   Several vulnerabilities were reported in OpenSSH. A remote authenticated server can obtain potentially sensitive information from OpenSSH client memory on the target system or potentially execute arbitrary code on the target client system.

An OpenSSH server on an authenticated connection can cause the connected client to leak portions of client memory to the server [CVE-2016-0777]. This may include private client user keys.

The Qualys Security team reported this vulnerability.

An OpenSSH server on an authenticated connection may be able to trigger a buffer overflow and file descriptor leak in the connected client in certain cases when using ProxyCommand, ForwardAgent, or ForwardX11 [CVE-2016-0778].

The Qualys Security team reported this vulnerability.

A user may be able to trigger an out-of-bounds read access error in the packet handling code [CVE-2016-1907]. Ben Hawkes reported this vulnerability.

Impact:   A remote authenticated server can obtain potentially sensitive information from the target connected client.
Solution:   OpenBSD has issued a fix, available at:

http://ftp.openbsd.org/pub/OpenBSD/patches/5.7/common/022_ssh.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/5.8/common/010_ssh.patch.sig

Cause:   Access control error, Boundary error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  5.7, 5.8

Message History:   This archive entry is a follow-up to the message listed below.
Jan 14 2016 OpenSSH Flaws Let Remote Authenticated Users Obtain Potentially Sensitive Information From Client Memory



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