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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(IBM Issues Fix for IBM AIX) OpenSSL OCSP Status Request Extension Processing Error Lets Remote Authenticated Users Consume Excessive Memory Resources
SecurityTracker Alert ID:  1037296
SecurityTracker URL:  http://securitytracker.com/id/1037296
CVE Reference:   CVE-2016-6304   (Links to External Site)
Date:  Nov 15 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.1, 1.0.2, 1.1.0
Description:   A vulnerability was reported in OpenSSL. A remote authenticated user can consume excessive memory on the target system.

A remote authenticated user can repeatedly request renegotiation and send a specially crafted OCSP Status Request extension to consume excessive memory on the target system.

Versions 1.0.1g and after are affected in the default configuration, even if OCSP is not supported.

Versions prior to 1.0.1g are affected only if the application using OpenSSL explicitly enables OCSP stapling support.

Builds that use the "no-ocsp" build time option are not affected.

The vendor was notified on August 29, 2016.

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

Impact:   A remote authenticated user can consume excessive memory resources on the target system.
Solution:   IBM has issued a fix for IBM AIX:

For OpenSSL 1.0.1: openssl-1.0.1.517.tar.Z
For OpenSSL 1.0.2: openssl-1.0.2.1000.tar.Z
For OpenSSL 1.0.1 FIPS: openssl-20.13.101.500.tar.Z
For OpenSSL 1.0.2 FIPS: openssl-20.13.102.1000.tar.Z

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssl_advisory21.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssl_advisory21.asc (Links to External Site)
Cause:   Resource 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.
Sep 22 2016 OpenSSL OCSP Status Request Extension Processing Error Lets Remote Authenticated Users Consume Excessive Memory Resources



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