Is CVE-2016-10025 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2016-10025 being exploited in the wild.

How severe is CVE-2016-10025?

Medium severity, with a CVSS score of 5.5, published 26 January 2017.

Which products and versions are affected?

Citrix Xenserver 6.0.2, 6.2.0, 6.5, 7.0; Xen Project Xen 4.6.x through 4.8.x.

Is there a fix for CVE-2016-10025?

A patch was published on 2016-12-21. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2016-10025 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2016-10025?

Check whether you run Citrix Xenserver or Xen Project Xen at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2016-10025: Xen VMFUNC emulation NULL pointer dereference on AMD SVM

CVE-2016-10025 · Severity: medium · CVSS 5.5 · Published 2017-01-26

A vulnerability in the Xen hypervisor, which is software used to run multiple virtual machines on a single physical server, could allow a user on a guest virtual machine to crash the entire host system. This issue specifically affects servers using AMD processors. An exploit would result in a total service outage for all virtual machines running on that physical hardware, though it does not allow for data theft.

Technologies: Citrix Xenserver, Xen Project Xen. Vendors: Citrix, Xen Project.

Quick answers

Is CVE-2016-10025 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2016-10025 being exploited in the wild.
How severe is CVE-2016-10025?: Medium severity, with a CVSS score of 5.5, published 26 January 2017.
Which products and versions are affected?: Citrix Xenserver 6.0.2, 6.2.0, 6.5, 7.0; Xen Project Xen 4.6.x through 4.8.x.
Is there a fix for CVE-2016-10025?: A patch was published on 2016-12-21. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2016-10025 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2016-10025?: Check whether you run Citrix Xenserver or Xen Project Xen at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A NULL pointer dereference vulnerability exists in Xen versions 4.6.x through 4.8.x during the emulation of the Intel VMX VMFUNC leaf 0 instruction. While the hvmemul_vmfunc function pointer was introduced for Intel hardware, the pointer remains NULL on AMD SVM hardware. The hypervisor fails to perform a NULL check before an indirect function call at the call site. A local attacker with privileges in an HVM guest can trigger this missing check to cause a hypervisor panic, leading to a denial of service. This issue only affects HVM guests running on AMD x86 hardware; PV guests and Intel-based systems are not impacted. Patches are available from the Xen Project (XSA-203).

Affected products

Xen Project Xen 4.6.x through 4.8.x
Citrix XenServer 6.0.2, 6.2.0, 6.5, 7.0

Timeline

2016-12-21: advisory: Xen Project released XSA-203
2016-12-21: patched
2017-01-26: disclosed: NVD publication date

References

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