Amazon Linux AMI : kernel (ALAS-2016-703) - Nessus

High Plugin ID: 91241

This page contains detailed information about the Amazon Linux AMI : kernel (ALAS-2016-703) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 91241
Name: Amazon Linux AMI : kernel (ALAS-2016-703)
Filename: ala_ALAS-2016-703.nasl
Vulnerability Published: N/A
This Plugin Published: 2016-05-19
Last Modification Time: 2019-04-11
Plugin Version: 2.7
Plugin Type: local
Plugin Family: Amazon Linux Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/AmazonLinux/release, Host/AmazonLinux/rpm-list, Host/local_checks_enabled

Vulnerability Information

Synopsis

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

Description

The Linux kernel did not properly suppress hugetlbfs support in x86 PV guests, which could allow local PV guest users to cause a denial of service (guest OS crash) by attempting to access a hugetlbfs mapped area. (CVE-2016-3961 / XSA-174)

A flaw was found in the way the Linux kernel's ASN.1 DER decoder processed certain certificate files with tags of indefinite length. A local, unprivileged user could use a specially crafted X.509 certificate DER file to crash the system or, potentially, escalate their privileges on the system. (CVE-2016-0758)

Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different user's file after unsynchronized hole punching and page-fault handling. (CVE-2015-8839)

The following flaws were also fixed in this version :

CVE-2016-4557 : Use after free vulnerability via double fdput

CVE-2016-4581 : Slave being first propagated copy causes oops in propagate_mnt

CVE-2016-4486 : Information leak in rtnetlink

CVE-2016-4485 : Information leak in llc module

CVE-2016-4558 : bpf: refcnt overflow

CVE-2016-4565 : infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko

CVE-2016-0758 : tags with indefinite length can corrupt pointers in asn1_find_indefinite_length()

CVE-2015-8839 : ext4 filesystem page fault race condition with fallocate call.

Solution

Run 'yum update kernel' to update your system.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Amazon Linux AMI : kernel (ALAS-2016-703) vulnerability:

Metasploit: exploit/linux/local/bpf_priv_esc
[Linux BPF doubleput UAF Privilege Escalation]
Exploit-DB: exploits/linux/local/40759.rb
[EDB-40759: Linux Kernel 4.4 (Ubuntu 16.04) - 'BPF' Local Privilege Escalation (Metasploit)]
Exploit-DB: exploits/linux/local/46006.c
[EDB-46006: Linux Kernel 4.4 - 'rtnetlink' Stack Memory Disclosure]
GitHub: https://github.com/andrewwebber/kate
[CVE-2016-0758]
GitHub: https://github.com/bcoles/kasld
[CVE-2016-4486]
GitHub: https://github.com/dylandreimerink/gobpfld
[CVE-2016-4557]
GitHub: https://github.com/mudongliang/LinuxFlaw/tree/master/CVE-2016-4557
[CVE-2016-4557]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS V2 Vector [?]: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.0 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.0 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:	7.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.8
CVSS Temporal Score:	7.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.2 (High)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-703.
#

include("compat.inc");

if (description)
{
  script_id(91241);
  script_version("2.7");
  script_cvs_date("Date: 2019/04/11 17:23:06");

  script_cve_id("CVE-2015-8839", "CVE-2016-0758", "CVE-2016-3961", "CVE-2016-4485", "CVE-2016-4486", "CVE-2016-4557", "CVE-2016-4558", "CVE-2016-4565", "CVE-2016-4581");
  script_xref(name:"ALAS", value:"2016-703");

  script_name(english:"Amazon Linux AMI : kernel (ALAS-2016-703)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Amazon Linux AMI host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The Linux kernel did not properly suppress hugetlbfs support in x86 PV
guests, which could allow local PV guest users to cause a denial of
service (guest OS crash) by attempting to access a hugetlbfs mapped
area. (CVE-2016-3961 / XSA-174)

A flaw was found in the way the Linux kernel's ASN.1 DER decoder
processed certain certificate files with tags of indefinite length. A
local, unprivileged user could use a specially crafted X.509
certificate DER file to crash the system or, potentially, escalate
their privileges on the system. (CVE-2016-0758)

Multiple race conditions in the ext4 filesystem implementation in the
Linux kernel before 4.5 allow local users to cause a denial of service
(disk corruption) by writing to a page that is associated with a
different user's file after unsynchronized hole punching and
page-fault handling. (CVE-2015-8839)

The following flaws were also fixed in this version :

CVE-2016-4557 : Use after free vulnerability via double fdput

CVE-2016-4581 : Slave being first propagated copy causes oops in
propagate_mnt

CVE-2016-4486 : Information leak in rtnetlink

CVE-2016-4485 : Information leak in llc module

CVE-2016-4558 : bpf: refcnt overflow

CVE-2016-4565 : infiniband: Unprivileged process can overwrite kernel
memory using rdma_ucm.ko

CVE-2016-0758 : tags with indefinite length can corrupt pointers in
asn1_find_indefinite_length()

CVE-2015-8839 : ext4 filesystem page fault race condition with
fallocate call."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2016-703.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update kernel' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Linux BPF doubleput UAF Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/19");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Amazon Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"ALA", reference:"kernel-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-debuginfo-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"i686", reference:"kernel-debuginfo-common-i686-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-devel-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-doc-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-headers-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-debuginfo-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-devel-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perf-4.4.10-22.54.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"perf-debuginfo-4.4.10-22.54.amzn1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel / kernel-debuginfo / kernel-debuginfo-common-i686 / etc");
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/ala_ALAS-2016-703.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ala_ALAS-2016-703.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ala_ALAS-2016-703.nasl

Go back to menu.

How to Run

Here is how to run the Amazon Linux AMI : kernel (ALAS-2016-703) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Amazon Linux Local Security Checks plugin family.
On the right side table select Amazon Linux AMI : kernel (ALAS-2016-703) plugin ID 91241.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl ala_ALAS-2016-703.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ala_ALAS-2016-703.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - ala_ALAS-2016-703.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state ala_ALAS-2016-703.nasl -t <IP/HOST>

Go back to menu.

References

ALAS | Amazon Linux Security Advisory:

2016-703

See also:

Similar and related Nessus plugins:

91112 - Oracle Linux 7 : kernel (ELSA-2016-1033)
91114 - RHEL 7 : kernel (RHSA-2016:1033)
91116 - RHEL 7 : kernel-rt (RHSA-2016:1051)
91117 - RHEL 6 : MRG (RHSA-2016:1055)
91181 - Ubuntu 14.04 LTS : linux vulnerability (USN-2975-1)
91182 - Ubuntu 12.04 LTS : linux-lts-trusty vulnerability (USN-2975-2)
91183 - Ubuntu 14.04 LTS : linux-lts-utopic vulnerability (USN-2976-1)
91184 - Ubuntu 14.04 LTS : linux-lts-vivid vulnerability (USN-2977-1)
91185 - Ubuntu 15.10 : linux vulnerabilities (USN-2978-1)
91186 - Ubuntu 14.04 LTS : linux-lts-wily vulnerabilities (USN-2978-2)
91187 - Ubuntu 15.10 : linux-raspi2 vulnerability (USN-2978-3)
91188 - Ubuntu 16.04 LTS : linux vulnerabilities (USN-2979-1)
91189 - Ubuntu 14.04 LTS : linux-lts-xenial vulnerabilities (USN-2979-2)
91190 - Ubuntu 16.04 LTS : linux-raspi2 vulnerability (USN-2979-3)
91191 - Ubuntu 16.04 LTS : linux-snapdragon vulnerability (USN-2979-4)
91213 - Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2016-3559)
91215 - Scientific Linux Security Update : kernel on SL7.x x86_64 (20160512)
91280 - OracleVM 3.4 : kernel-uek (OVMSA-2016-0052)
91291 - Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2016-3565)
91295 - OracleVM 3.3 : kernel-uek (OVMSA-2016-0053)
91425 - Ubuntu 14.04 LTS : linux vulnerabilities (USN-2989-1)
91559 - Ubuntu 12.04 LTS : linux vulnerabilities (USN-2996-1)
91560 - Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2998-1)
91562 - Ubuntu 14.04 LTS : linux-lts-utopic vulnerabilities (USN-3000-1)
91563 - Ubuntu 14.04 LTS : linux-lts-vivid vulnerabilities (USN-3001-1)
91564 - Ubuntu 14.04 LTS : linux-lts-wily vulnerabilities (USN-3002-1)
91565 - Ubuntu 15.10 : linux vulnerabilities (USN-3003-1)
91566 - Ubuntu 15.10 : linux-raspi2 vulnerabilities (USN-3004-1)
91567 - Ubuntu 14.04 LTS : linux-lts-xenial vulnerabilities (USN-3005-1)
91568 - Ubuntu 16.04 LTS : linux vulnerabilities (USN-3006-1)
91569 - Ubuntu 16.04 LTS : linux-raspi2 vulnerabilities (USN-3007-1)
91687 - Debian DLA-516-1 : linux security update
91736 - openSUSE Security Update : the Linux Kernel (openSUSE-2016-753)
91743 - OracleVM 3.2 : kernel-uek (OVMSA-2016-0060)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ala_ALAS-2016-703.nasl version 2.7. For more plugins, visit the Nessus Plugin Library.

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Amazon Linux AMI : kernel (ALAS-2016-703) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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