Amazon Linux AMI : kernel (ALAS-2016-669)

high Nessus Plugin ID 89966
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Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

When running as a Xen 64-bit PV guest, user mode processes not supposed to be able to access I/O ports may be granted such permission, potentially resulting in one or more of in-guest privilege escalation, guest crashes (Denial of Service), or in-guest information leaks. (CVE-2016-3157)

In some cases, the kernel did not correctly fix backward jumps in a new eBPF program, which could allow arbitrary reads. (CVE-2016-2383)

The kernel incorrectly accounted for the number of in-flight fds over a unix domain socket to the original opener of the file descriptor.
Another process could arbitrarily deplete the original file opener's maximum open files resource limit. (CVE-2016-2550)

A resource-exhaustion vulnerability was found in the kernel, where an unprivileged process could allocate and accumulate far more file descriptors than the process' limit. A local, unauthenticated user could exploit this flaw by sending file descriptors over a Unix socket and then closing them to keep the process' fd count low, thereby creating kernel-memory or file-descriptors exhaustion (denial of service). (CVE-2016-2847)

Solution

Run 'yum update kernel' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2016-669.html

Plugin Details

Severity: High

ID: 89966

File Name: ala_ALAS-2016-669.nasl

Version: 2.5

Type: local

Agent: unix

Published: 3/17/2016

Updated: 4/18/2018

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS v3

Risk Factor: High

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:kernel-doc, p-cpe:/a:amazon:linux:kernel-headers, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:perf-debuginfo, cpe:/o:amazon:linux

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Patch Publication Date: 3/16/2016

Reference Information

CVE: CVE-2016-2383, CVE-2016-2550, CVE-2016-2847, CVE-2016-3157

ALAS: 2016-669