Amazon Linux AMI : kernel (ALAS-2016-694)

Critical Nessus Plugin ID 90778

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VPR Score: 6.7

Synopsis

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

Description

An integer overflow vulnerability was found in xt_alloc_table_info, which on 32-bit systems can lead to small structure allocation and a copy_from_user based heap corruption. (CVE-2016-3135)

In the mark_source_chains function (net/ipv4/netfilter/ip_tables.c) it is possible for a user-supplied ipt_entry structure to have a large next_offset field. This field is not bounds checked prior to writing a counter value at the supplied offset. (CVE-2016-3134)

A weakness was found in the Linux ASLR implementation. Any user able to run 32-bit applications in a x86 machine can disable the ASLR by setting the RLIMIT_STACK resource to unlimited. (CVE-2016-3672)

Destroying a network interface with a large number of IPv4 addresses keeps a rtnl_lock for a very long time, which can block many network-related operations. (CVE-2016-3156)

A use-after-free vulnerability was found in the kernel's socket recvmmsg subsystem. This may allow remote attackers to corrupt memory and may allow execution of arbitrary code. This corruption takes place during the error handling routines within __sys_recvmmsg() function.
(CVE-2016-7117)

(Updated on 2017-01-19: CVE-2016-7117 was fixed in this release but was previously not part of this errata.)

Solution

Run 'yum update kernel' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2016-694.html

Plugin Details

Severity: Critical

ID: 90778

File Name: ala_ALAS-2016-694.nasl

Version: 2.7

Type: local

Agent: unix

Published: 2016/04/29

Updated: 2019/04/11

Dependencies: 12634

Risk Information

Risk Factor: Critical

VPR Score: 6.7

CVSS v2.0

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 9.8

Temporal Score: 8.8

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/04/27

Reference Information

CVE: CVE-2016-3134, CVE-2016-3135, CVE-2016-3156, CVE-2016-3672, CVE-2016-7117

ALAS: 2016-694