Friday, April 11, 2014

Netiquette Security - The Ultimate Guide For "Heartbleed" From US-CERT - Via Netiquette IQ



The best source of Internet security is US CERT, United States Computer Emergency Readiness Team. This should be a source for all on-line companies, groups and users.
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·         OpenSSL 1.0.1 through 1.0.1f
·         OpenSSL 1.0.2-beta
Overview
A vulnerability in OpenSSL could allow a remote attacker to expose sensitive data, possibly including user authentication credentials and secret keys, through incorrect memory handling in the TLS heartbeat extension.
Description
OpenSSL versions 1.0.1 through 1.0.1f contain a flaw in its implementation of the TLS/DTLS heartbeat functionality. This flaw allows an attacker to retrieve private memory of an application that uses the vulnerable OpenSSL library in chunks of 64k at a time. Note that an attacker can repeatedly leverage the vulnerability to retrieve as many 64k chunks of memory as are necessary to retrieve the intended secrets. The sensitive information that may be retrieved using this vulnerability include:
·         Primary key material (secret keys)
·         Secondary key material (user names and passwords used by vulnerable services)
·         Protected content (sensitive data used by vulnerable services)
·         Collateral (memory addresses and content that can be leveraged to bypass exploit mitigations)
Exploit code is publicly available for this vulnerability.  Additional details may be found in CERT/CC Vulnerability Note VU#720951.
Impact
This flaw allows a remote attacker to retrieve private memory of an application that uses the vulnerable OpenSSL library in chunks of 64k at a time.
Solution
OpenSSL 1.0.1g has been released to address this vulnerability.  Any keys generated with a vulnerable version of OpenSSL should be considered compromised and regenerated and deployed after the patch has been applied.
US-CERT recommends system administrators consider implementing Perfect Forward Secrecy to mitigate the damage that may be caused by future private key disclosures.
References
·         OpenSSL Security Advisory
·         The Heartbleed Bug
·         Perfect Forward Secrecy
Revisions
·         Initial Publication
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In addition to this blog, I have authored the premiere book on Netiquette, " Netiquette IQ - A Comprehensive Guide to Improve, Enhance and Add Power to Your Email". You can view my profile, reviews of the book and content excerpts at:

 www.amazon.com/author/paulbabicki


 If you would like to listen to experts in all aspects of Netiquette and communication, try my radio show on BlogtalkRadio  and an online newsletter via paper.li.I have established Netiquette discussion groups with Linkedin and  Yahoo I am also a member of the International Business Etiquette and Protocol Group and Minding Manners among others. I regularly consult for the Gerson Lehrman Group, a worldwide network of subject matter experts and I have been contributing to the blogs Everything Email and emailmonday . My work has appeared in numerous publications and I have presented to groups such as The Breakfast Club of NJ Rider University and  PSG of Mercer County, NJ.