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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Ubuntu Issues Fix) OpenSSL SSL3_AL_WARNING Alert Processing Flaw Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1037753
SecurityTracker URL:  http://securitytracker.com/id/1037753
CVE Reference:   CVE-2016-8610   (Links to External Site)
Date:  Jan 31 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 0.9.8, 1.0.1, 1.0.2 - 1.0.2h, 1.1.0
Description:   A vulnerability was reported in OpenSSL. A remote user can consume excessive CPU resources on the target system.

The ssl3_read_bytes() function in 'ssl/s3_pkt.c' does not properly handle certain packets. A remote user can send a flood of SSL3_AL_WARNING alerts during the SSL handshake to consume excessive CPU resources on the target system. As a result, services that use the OpenSSL library may become unavailable for the duration of the packet flood.

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

Impact:   A remote user can consume excessive CPU resources on the target system.
Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-3181-1

Vendor URL:  www.ubuntu.com/usn/usn-3181-1 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 16.04 LTS, 16.10

Message History:   This archive entry is a follow-up to the message listed below.
Oct 24 2016 OpenSSL SSL3_AL_WARNING Alert Processing Flaw Lets Remote Users Consume Excessive CPU Resources on the Target System



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