Amazon Linux AMI update for kernel

Published: 2017-09-18

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2017-12134
CWE-ID	CWE-264
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Privilege escalation

EUVDB-ID: #VU7952

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12134

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local attacker on a Linux-based guest system to gain elevated privileges on the host system.

The weakness exists due to aa flaw in merging adjacent block IO requests. A local attacker on the guest system can incorrectly access memory during block stream processing to obtain potentially sensitive information or gain elevated privileges on the host system.

Mitigation

Update the affected packages.

i686:
    kernel-devel-4.9.43-17.39.amzn1.i686
    kernel-tools-4.9.43-17.39.amzn1.i686
    perf-debuginfo-4.9.43-17.39.amzn1.i686
    kernel-headers-4.9.43-17.39.amzn1.i686
    kernel-tools-devel-4.9.43-17.39.amzn1.i686
    perf-4.9.43-17.39.amzn1.i686
    kernel-debuginfo-4.9.43-17.39.amzn1.i686
    kernel-debuginfo-common-i686-4.9.43-17.39.amzn1.i686
    kernel-4.9.43-17.39.amzn1.i686
    kernel-tools-debuginfo-4.9.43-17.39.amzn1.i686

noarch:
    kernel-doc-4.9.43-17.39.amzn1.noarch

src:
    kernel-4.9.43-17.39.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.9.43-17.39.amzn1.x86_64
    kernel-tools-4.9.43-17.39.amzn1.x86_64
    perf-debuginfo-4.9.43-17.39.amzn1.x86_64
    perf-4.9.43-17.39.amzn1.x86_64
    kernel-tools-devel-4.9.43-17.39.amzn1.x86_64
    kernel-tools-debuginfo-4.9.43-17.39.amzn1.x86_64
    kernel-headers-4.9.43-17.39.amzn1.x86_64
    kernel-devel-4.9.43-17.39.amzn1.x86_64
    kernel-debuginfo-4.9.43-17.39.amzn1.x86_64
    kernel-4.9.43-17.39.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2017-897.html

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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