Ubuntu update for Linux kernel (Azure)

1) Path traversal

EUVDB-ID: #VU12296

Risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12188

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to cause DoS condition or execute arbitrary code on the target system.

The weakness exists in arch/x86/kvm/mmu.c due to improper traversal of guest pagetable entries to resolve a guest virtual address when nested virtualisation is used. An adjacent attacker can cause the service to crash or execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update the affected packages

Ubuntu 16.04 LTS:

linux-image-4.11.0-1015-azure 4.11.0-1015.15

linux-image-azure 4.11.0.1015.15

Vulnerable software versions

Ubuntu: 16.04

External links

http://www.ubuntu.com/usn/usn-3488-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.