CVE-2017-10916

Description

The vCPU context-switch implementation in Xen through 4.8.x improperly interacts with the Memory Protection Extensions (MPX) and Protection Key (PKU) features, which makes it easier for guest OS users to defeat ASLR and other protection mechanisms, aka XSA-220.

CVSS Metrics

• v3.0•HIGH•Score: 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.39%• Percentile: 61%

Techniques & Countermeasures

• CWE-200•Exposure of Sensitive Information to an Unauthorized Actor

  The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Affected Systems

• xen•xen

  4.5.0 | 4.5.1 | 4.5.2 | 4.5.3 | 4.5.5 | 4.6.0 | 4.6.1 | 4.6.2 | 4.6.4 | 4.6.5 | 4.7.1 | 4.8.0 | 4.8.1

References (5)

• https://xenbits.xen.org/xsa/advisory-220.html
• https://security.gentoo.org/glsa/201708-03
• http://www.debian.org/security/2017/dsa-3969
• http://www.securitytracker.com/id/1038730
• http://www.securityfocus.com/bid/99167