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Security in Context: The BeyondTrust Blog

Welcome to Security in Context

Bringing you news and commentary on solutions and strategies for protecting critical IT infrastructure in the context of your business.

sudo authentication bypass when clock is reset

Posted March 7, 2013    Rod Simmons

A recent discovery by a German researcher, Marco Schoepl, found that it is possible for a user to bypass sudo authentication by resetting the clock. To read more about this vulnerability see the articles on seclist.org and threatpost.com. What we have found is that many highly secure customers have already adopted the timestamp_timeout=0 setting which will bypass the default 5 minute password reentry interval and requires authentication for each command.

clock-resetYou could consider this vulnerability a configuration issue but it does highlight a general need to use a solution that provides an option for IO logging. Our PowerBroker Unix & Linux solution is a Command Control solution that also provides a method to perform IO Logging so you can replay a user’s entire session, after all, once they have elevated permissions it becomes vital to securely log the actions of that user.

It is always possible to have a configuration issue in any security system due to flexibility and general complexity of building a secure system. The key principle is to only delegate the rights needed and perform IO logging along with multi-factor authentication as an additional safety measure.

If you require a Sudo replacement, or want to implement greater controls where compliance requires it, PowerBroker Servers can help. Learn more about PowerBroker Servers now!

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Additional articles

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Adobe Patches Zero-Day Flaw Being Exploited in the Wild

Posted January 22, 2015    BeyondTrust Research Team

Earlier this week, French malware researcher Kafeine reported on a new Adobe Flash zero-day vulnerability that was being exploited in the wild using the latest versions of the Angler Exploit Toolkit. “Any version of Internet Explorer or Firefox with any version of Windows will get owned if Flash up to 16.0.0.287 (included) is installed and enabled”…

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Your Data Security Strategy Starts with Deploying a Least Privilege Model (part 2 of 2)

Posted January 22, 2015    Scott Lang

In last week’s blog, we talked about how controls and accountability must be put into place so that only the right folks can access data and the systems on which that data resides, and that employing a least privilege model helps to achieve that and more. We’re using conclusions and data from a recent report…

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Basic Blocking and Tackling for Defending Against Advanced Targeted Attacks

Posted January 22, 2015    Larry Brock

With football season at its pinnacle at both the college and professional levels, the best teams continually focus on the fundamentals that make them successful. In security, we need to do the same.  It is okay for us to have a few key plays, especially in certain industries where we have to focus on unique…

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