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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Oracle Issues Fix for Oracle Linux) OpenSSL SSL3_AL_WARNING Alert Processing Flaw Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1037861
SecurityTracker URL:  http://securitytracker.com/id/1037861
CVE Reference:   CVE-2016-8610   (Links to External Site)
Date:  Feb 21 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:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2017-0286.html

Vendor URL:  linux.oracle.com/errata/ELSA-2017-0286.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  6, 7

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



 Source Message Contents

Date:  Mon, 20 Feb 2017 14:24:27 -0800
Subject:  [El-errata] ELSA-2017-0286 Moderate: Oracle Linux 7 openssl security update

Oracle Linux Security Advisory ELSA-2017-0286

http://linux.oracle.com/errata/ELSA-2017-0286.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
openssl-1.0.1e-60.el7_3.1.x86_64.rpm
openssl-devel-1.0.1e-60.el7_3.1.i686.rpm
openssl-devel-1.0.1e-60.el7_3.1.x86_64.rpm
openssl-libs-1.0.1e-60.el7_3.1.i686.rpm
openssl-libs-1.0.1e-60.el7_3.1.x86_64.rpm
openssl-perl-1.0.1e-60.el7_3.1.x86_64.rpm
openssl-static-1.0.1e-60.el7_3.1.i686.rpm
openssl-static-1.0.1e-60.el7_3.1.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/openssl-1.0.1e-60.el7_3.1.src.rpm



Description of changes:

[1.0.1e-60.1]
- fix CVE-2017-3731 - DoS via truncated packets with RC4-MD5 cipher
- fix CVE-2016-8610 - DoS of single-threaded servers via excessive alerts


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El-errata@oss.oracle.com
https://oss.oracle.com/mailman/listinfo/el-errata
 
 


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