VMware bug allows Windows hack to attack Macs

Mac owners' worst nightmare -- get hacked by Windows -- possible, says researcher

A bug in VMware's Fusion virtualization software could be used to run malicious code on a Mac by exploiting Windows in a virtual machine, a security researcher said Wednesday.

VMware has released Fusion 2.0.4 to plug the hole.

According to Kostya Kortchinsky, an exploit researcher at Immunity Inc., a critical vulnerability in VMware's virtual machine display function can be used to read and write memory on the "host" operating system -- the OS running the physical hardware.

Kortchinsky crafted an exploit for Immunity's customers -- the Miami-based company is best-known for its Canvas penetration testing tool -- and posted a video clip that demonstrates an attack on a machine running Windows Vista Service Pack 1 (SP1) as the host operating system, and Windows XP as the "guest," the OS running in a virtual machine.

"This is indeed a guest-to-host exploit," Kortchinsky said in an e-mail today. "It uses several vulnerabilities in the 'Display functions' (as VMware put it) that allow [someone] to read and write arbitrary memory in the host. Thus the guest can run some code on the host, effectively bypassing ASLR and DEP on Vista SP1."

The same tactics can be employed against a guest operating system -- say Windows XP -- running in Fusion on a Mac powered by Apple's Mac OS X, Kortchinsky confirmed. "The vulnerability is also present in VMware Fusion and as such would allow a guest (Windows or Linux) to run code on the Mac OS X host," he said. "We didn't implement this exploit though, but will probably in a near future."

The company has published a white paper discussing the VMware vulnerabilities, as well as working exploits that can compromise Windows or Ubuntu hosts; the paper and exploits, however, are available only to Canvas Early Updates customers.

VMware issued a security advisory last Friday acknowledging the bug, and provided links to new versions of its products that patched the problem. Fusion 2.0.4, a 186MB file, can be downloaded free-of-charge from VMware's site by current users of the company's Mac virtualization software.

Fusion, and its primary commercial competitor, Parallels Desktop, are used on a large number of Macs by users, most of whom want a virtual environment to run Windows and select applications available only for Microsoft's OS. Sales of Fusion and Parallels were up 50% last September over the same month the year before, market research company NPD Group said then.

Tags MacAppleMicrosoft WindowsMac OS XvirtualisationVMware

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld

Comments

Comments are now closed.

Most Popular Reviews

Follow Us

Best Deals on GoodGearGuide

Shopping.com

Latest News Articles

Resources

GGG Evaluation Team

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell

LIFEBOOK UH574

The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi

STYLISTIC Q702

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott

STYLISTIC Q702

My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Latest Jobs

Shopping.com

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?