Menu
VMware patches virtual machine escape issue on Windows

VMware patches virtual machine escape issue on Windows

The updates also address denial-of-service issues in multiple products

VMware logo

VMware logo

VMware has released security updates for several of its virtualization products in order to address critical vulnerabilities that could allow attackers to break out of virtual machines and execute rogue code on the host operating systems.

The code execution flaws affect the Windows versions of VMware Workstation, VMware Player and VMware Horizon Client. They were discovered by Kostya Kortchinsky of the Google Security Team and stem from a printer virtualization feature that allows a virtual machine's guest OS to access the printer attached to the host computer.

"On VMware Workstation 11.1, the virtual printer device is added by default to new VMs, and on recent Windows Hosts, the Microsoft XPS Document Writer is available as a default printer," Kortchinsky explained in an advisory. "Even if the VMware Tools are not installed in the Guest, the COM1 port can be used to talk to the Host printing Proxy."

An attacker with access to the guest OS can send EMFSPOOL and EMF files to the virtual COM1 serial port in order to exploit various vulnerabilities in the printer proxy process running on the host OS and then execute rogue code, the researcher said.

Some of the vulnerabilities can also be used to perform a denial-of-service attack against the Windows OS that runs the vulnerable VMware software.

VMware addressed the flaws in the newly released VMware Workstation 11.1.1 and 10.0.6; VMware Player 7.1.1 and 6.0.6 and the VMware Horizon Client for Windows 3.4.0, 3.2.1 and 5.4.2.

A workaround suggested by Kortchinsky is to "disconnect" the virtual printer from the guest OS or to remove it entirely from the virtual machine settings.

A separate input validation issue was identified for RPC commands in VMware Workstation 10.x, VMware Player 6.x, Fusion 7.x and 6.x, running on any supported platform. The flaw can be exploited to launch a denial-of-service attack against guest operating systems with the 32-bit architecture, or host operating systems with the 64-bit architecture.

To address this issue, users are advised to upgrade to VMware Workstation 10.0.5, VMware Player 6.0.6 or Fusion 7.0.1 and 6.0.6.


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags VMwarepatchesExploits / vulnerabilities

Featured

Slideshows

Reseller News kicks off awards season in 2019 with Judges' Lunch

Reseller News kicks off awards season in 2019 with Judges' Lunch

The 2019 Reseller News Innovation Awards has kicked off with the Judges Lunch in Auckland with 70 judges in the voting panel. The awards will reflect the changing dynamics of the channel, recognising excellence across customer value and innovation - spanning start-ups, partners, distributors and vendors. Photos by Christine Wong.

Reseller News kicks off awards season in 2019 with Judges' Lunch
Reseller News welcomes industry figures for 2019 Hall of Fame lunch

Reseller News welcomes industry figures for 2019 Hall of Fame lunch

Reseller News welcomed 2018 inductees - Chris Simpson, Kendra Ross and Phill Patton - to the third running of the Reseller News Hall of Fame lunch, held at the French Cafe in Auckland. The inductees discussed the changing landscape of the technology industry in New Zealand, while outlining ways to attract a new breed of players to the ecosystem. Photos by Gino Demeer.

Reseller News welcomes industry figures for 2019 Hall of Fame lunch
Upcoming tech talent share insights at inaugural Emerging Leaders Forum 2019

Upcoming tech talent share insights at inaugural Emerging Leaders Forum 2019

The channel came together for the inaugural Reseller News Emerging Leaders Forum in New Zealand, created to provide a program that identifies, educates and showcases the upcoming talent of the ICT industry. Hosted as a half day event, attendees heard from industry champions as keynoters and panelists talked about future opportunities and leadership paths and joined mentoring sessions with members of the ICT industry Hall of Fame. The forum concluded with 30 Under 30 Tech Awards across areas of Sales, Entrepreneur, Marketing, Management, Technical and Human Resources. Photos by Gino Demeer.

Upcoming tech talent share insights at inaugural Emerging Leaders Forum 2019
Show Comments