Menu
Xen Project patches serious virtual machine escape flaws

Xen Project patches serious virtual machine escape flaws

The updates fix a total of four flaws, two allowing privilege escalation from guest VMs to the host

The Xen Project has fixed four vulnerabilities in its widely used virtualization software, two of which could allow malicious virtual machine administrators to take over host servers.

Flaws that break the isolation layer between virtual machines are the most serious kind for a hypervisor like Xen, which allows users to run multiple VMs on the same underlying hardware in a secure manner.

The Xen hypervisor is widely used by cloud computing providers and virtual private server hosting companies like Linode, which had to reboot some of its servers over the past few days to apply the new patches.

The Xen updates, which were shared with partners in advance, were released publicly Thursday along with accompanying security advisories.

One vulnerability identified as CVE-2016-7093 affects Hardware Virtual Machines (HVMs) which use hardware-assisted virtualization. It allows an administrator of a guest OS to escalate their privilege to that of the host.

The vulnerability affects Xen versions 4.7.0 and later, as well as Xen releases 4.6.3 and 4.5.3 but only those deployments with HVM guests running on x86 hardware.

Another privilege escalation flaw identified as CVE-2016-7092 affects the other type of virtual machines supported by Xen: paravirtualized (PV) VMs. The vulnerability affects all Xen versions and allows administrators of 32-bit PV guests to gain privileges on the host.

The two other patched vulnerabilities, CVE-2016-7154 and CVE-2016-7094, can be exploited by guest administrators to cause denial-of-service conditions on the host. In the case of CVE-2016-7154, which only affects Xen 4.4, remote code execution and privilege escalation cannot be excluded, the Xen Project said in an advisory.

Meanwhile, CVE-2016-7094 affects all versions of Xen but only deployments hosting HVM guests on x86 hardware that are configured to run with shadow paging.


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.

Events

Featured

Slideshows

Meet the Reseller News 30 Under 30 Tech Awards 2020 winners

Meet the Reseller News 30 Under 30 Tech Awards 2020 winners

This year’s Reseller News 30 Under 30 Tech Awards were held as an integral part of the first entirely virtual Emerging Leaders​ forum, an annual event dedicated to identifying, educating and showcasing the New Zealand technology market’s rising stars. The 30 Under 30 Tech Awards 2020 recognised the outstanding achievements and business excellence of 30 talented individuals​, across both young leaders and those just starting out. In this slideshow, Reseller News honours this year's winners and captures their thoughts about how their ideas of leadership have changed over time.​

Meet the Reseller News 30 Under 30 Tech Awards 2020 winners
Reseller News Exchange Auckland: Beyond the myths — how partners can master cloud security

Reseller News Exchange Auckland: Beyond the myths — how partners can master cloud security

This exclusive Reseller News Exchange event in Auckland explored the challenges facing the partner community on the cloud security frontier, as well as market trends, customer priorities and how the channel can capitalise on the opportunities available. In association with Arrow, Bitdefender, Exclusive Networks, Fortinet and Palo Alto Networks. Photos by Gino Demeer.

Reseller News Exchange Auckland: Beyond the myths — how partners can master cloud security
Reseller News welcomes industry figures at 2020 Hall of Fame lunch

Reseller News welcomes industry figures at 2020 Hall of Fame lunch

Reseller News welcomed 2019 inductees - Leanne Buer, Ross Jenkins and Terry Dunn - to the fourth running of the Reseller News Hall of Fame lunch, held at the French Cafe in Auckland. The inductees discussed the changing face of the IT channel ecosystem in New Zealand and what it means to be a Reseller News Hall of Fame inductee. Photos by Gino Demeer.

Reseller News welcomes industry figures at 2020 Hall of Fame lunch
Show Comments