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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(IBM Issues Fix for IBM AIX) OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources
SecurityTracker Alert ID:  1037866
SecurityTracker URL:  http://securitytracker.com/id/1037866
CVE Reference:   CVE-2016-8858   (Links to External Site)
Date:  Feb 21 2017
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:   IBM has issued a fix for IBM AIX.

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssh_advisory10.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssh_advisory10.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.
Oct 19 2016 OpenSSH Key Exchange Initialization Bug in kex_input_kexinit() Lets Remote Users Consume Excessive Memory Resources



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