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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources
SecurityTracker Alert ID:  1037057
SecurityTracker URL:  http://securitytracker.com/id/1037057
CVE Reference:   CVE-2016-8858   (Links to External Site)
Updated:  Dec 19 2016
Original Entry Date:  Oct 19 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 7.4
Description:   A vulnerability was reported in OpenSSH. A remote user can consume excessive memory on the target system.

A remote user can send specially crafted data during the key exchange process to trigger a flaw in kex_input_kexinit() and consume excessive memory on the target system. This can be exploited to consume up to 384 MB per connection.

Shi Lei from Gear Team, Qihoo 360 Inc., reported this vulnerability.

Impact:   A remote user can consume excessive memory resources on the target system.
Solution:   The vendor has issued a source code fix, available at:

http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c#rev1.127

On December 19, 2016, the vendor issued a fixed release version (7.4).

Vendor URL:  www.openssh.com/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 2 2016 (FreeBSD Issues Fix) OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources
FreeBSD has issued a fix for FreeBSD 10.3 and 11.0.
Feb 21 2017 (IBM Issues Fix for IBM AIX) OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources
IBM has issued a fix for IBM AIX 5.3, 6.1, 7.1, and 7.2.
Jan 15 2018 (Juniper Issues Fix for Juniper Junos) OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources
Juniper has issued a fix for Juniper Junos.
Feb 20 2018 (NetApp Issues Fix for Data ONTAP OS) OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources
NetApp has issued a fix for Data ONTAP OS.



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