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Bug in latest Linux gives untrusted users root access

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Linux
Security

A software developer has uncovered a bug in most versions of Linux that could allow untrusted users to gain complete control over the open-source operating system.

The null pointer dereference flaw was only fixed in the upcoming 2.6.32 release candidate of the Linux kernel, making virtually all production versions in use at the moment vulnerable. While attacks can be prevented by implementing a common feature known as mmap_min_addr, the RHEL distribution, short for Red Hat Enterprise Linux, doesn't properly implement that protection, Brad Spengler, who discovered the bug in mid October, told The Register.

What's more, many administrators are forced to disable the feature so their systems can run developer tools or desktop environments such as Wine.

The vulnerability was first reported by Spengler, a developer at grsecurity, a maker of applications that enhance the security of Linux. On October 22, he wrote a proof of concept attack for the local root exploit. Over the past few months, he has emerged as an outspoken critic of security practices followed by the team responsible for the Linux kernel.

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today's howtos

Chew on this: Ubuntu Core Linux comes to the uCRobotics Bubblegum-96 board

Linux and other open source software have been in the news quite a bit lately. As more and more people are seeing, closed source is not the only way to make money. A company like Red Hat, for instance, is able to be profitable while focusing its business on open source. Ubuntu is one of the most popular Linux-based operating systems, and it is not hard to see why. Not only is it easy to use and adaptable to much hardware (such as SoC boards), but there is a ton of free support online from the Ubuntu user community too. Today, Canonical announces a special Ubuntu Core image for the uCRobotics Bubblegum-96 board. Read more