SB2016062406 - Permissions, Privileges, and Access Controls in xen (Alpine package)
Published: June 24, 2016
Security Bulletin ID
SB2016062406
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-2016-4480)
The vulnerability allows a local non-authenticated attacker to execute arbitrary code.
The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.
Remediation
Install update from vendor's website.