Important kernel security update: CVE-2017-1000364; new kernel 2.6.32-042stab123.8 for Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0¶

1. Overview¶

This update provides a new kernel 2.6.32-042stab123.8 for Virtuozzo Containers for Linux 4.7, Server Bare Metal 5.0. The new kernel is based on the Red Hat Enterprise Linux 6.9 kernel 2.6.32-696.el6 and provides a security fix.

2. Security Fixes¶

• [Important] A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. (CVE-2017-1000364)

3. Installing the Update¶

Install the update with the ‘vzup2date’ utility included in the distribution.

4. References¶

• https://access.redhat.com/security/cve/CVE-2017-1000364

The JSON file with the list of new and updated packages is available at http://docs.virtuozzo.com/vza/VZA-2017-054.json.