CVE-2017-10920

Description

The grant-table feature in Xen through 4.8.x mishandles a GNTMAP_device_map and GNTMAP_host_map mapping, when followed by only a GNTMAP_host_map unmapping, which allows guest OS users to cause a denial of service (count mismanagement and memory corruption) or obtain privileged host OS access, aka XSA-224 bug 1.

CVSS Metrics

• v3.0•CRITICAL•Score: 10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
• v2.0•HIGH•Score: 10AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 2.55%• Percentile: 84%

Techniques & Countermeasures

• CWE-119•Improper Restriction of Operations within the Bounds of a Memory Buffer

  The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Affected Systems

• debian•xen

  < 4.8.1-1+deb9u3 | < 4.8.1-1+deb9u3 | < 4.8.1-1+deb9u3 | < 4.8.1-1+deb9u3

• xen•xen

  ≤ 4.8.1

References (6)

• https://security.gentoo.org/glsa/201708-03
• http://www.debian.org/security/2017/dsa-3969
• http://www.securitytracker.com/id/1038734
• https://xenbits.xen.org/xsa/advisory-224.html
• https://security.gentoo.org/glsa/201710-17
• https://security-tracker.debian.org/tracker/CVE-2017-10920