SB2017012307 - Permissions, Privileges, and Access Controls in Xen
Published: January 23, 2017 Updated: July 28, 2020
Security Bulletin ID
SB2017012307
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2016-9386)
The vulnerability allows a local authenticated user to execute arbitrary code.
The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.
Remediation
Install update from vendor's website.