Amazon Linux AMI : chkrootkit (ALAS-2014-370) - Nessus

Low Plugin ID: 78313

This page contains detailed information about the Amazon Linux AMI : chkrootkit (ALAS-2014-370) 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: 78313
Name: Amazon Linux AMI : chkrootkit (ALAS-2014-370)
Filename: ala_ALAS-2014-370.nasl
Vulnerability Published: N/A
This Plugin Published: 2014-10-12
Last Modification Time: 2018-04-18
Plugin Version: 1.5
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

Severity: Low
Vulnerability Published: N/A
Patch Published: 2014-07-09
CVE [?]: CVE-2014-0476
CPE [?]: cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:chkrootkit, p-cpe:/a:amazon:linux:chkrootkit-debuginfo

Synopsis

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

Description

A quoting issue was found in chkrootkit which would lead to a file in /tmp/ being executed, if /tmp/ was mounted without the noexec option. chkrootkit is typically run as the root user. A local attacker could use this flaw to escalate their privileges.

Solution

Run 'yum update chkrootkit' to update your system.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Amazon Linux AMI : chkrootkit (ALAS-2014-370) vulnerability:

Metasploit: exploit/unix/local/chkrootkit
[Chkrootkit Local Privilege Escalation]
Exploit-DB: exploits/linux/local/38775.rb
[EDB-38775: Chkrootkit - Local Privilege Escalation (Metasploit)]

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:H/Au:N/C:P/I:P/A:P

CVSS Base Score:	3.7 (Low)
Impact Subscore:	6.4
Exploitability Subscore:	1.9
CVSS Temporal Score:	NA (None)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.7 (Low)

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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-2014-370.
#

include("compat.inc");

if (description)
{
  script_id(78313);
  script_version("1.5");
  script_cvs_date("Date: 2018/04/18 15:09:35");

  script_cve_id("CVE-2014-0476");
  script_xref(name:"ALAS", value:"2014-370");

  script_name(english:"Amazon Linux AMI : chkrootkit (ALAS-2014-370)");
  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:
"A quoting issue was found in chkrootkit which would lead to a file in
/tmp/ being executed, if /tmp/ was mounted without the noexec option.
chkrootkit is typically run as the root user. A local attacker could
use this flaw to escalate their privileges."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2014-370.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update chkrootkit' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/C:P/I:P/A:P");
  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:'Chkrootkit Local 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:chkrootkit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:chkrootkit-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2014/07/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/10/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.");
  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:"chkrootkit-0.49-9.8.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"chkrootkit-debuginfo-0.49-9.8.amzn1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
  else security_note(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "chkrootkit / chkrootkit-debuginfo");
}

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-2014-370.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ala_ALAS-2014-370.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ala_ALAS-2014-370.nasl

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How to Run

Here is how to run the Amazon Linux AMI : chkrootkit (ALAS-2014-370) 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 : chkrootkit (ALAS-2014-370) plugin ID 78313.
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-2014-370.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ala_ALAS-2014-370.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-2014-370.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-2014-370.nasl -t <IP/HOST>

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References

ALAS | Amazon Linux Security Advisory:

2014-370

See also:

Similar and related Nessus plugins:

74294 - Debian DSA-2945-1 : chkrootkit - security update
74500 - Fedora 20 : chkrootkit-0.49-9.fc20 (2014-7071)
74502 - Fedora 19 : chkrootkit-0.49-9.fc19 (2014-7090)
103273 - GLSA-201709-05 : chkrootkit: Local privilege escalation
74480 - Mandriva Linux Security Advisory : chkrootkit (MDVSA-2014:122)
74322 - Ubuntu 10.04 LTS / 12.04 LTS / 13.10 / 14.04 LTS : chkrootkit vulnerability (USN-2230-1)
11262 - Default Password (D13hh[) for 'root' Account
11261 - Default Password (D13HH[) for 'root' Account
11264 - Default Password (wh00t!) for 'root' Account

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ala_ALAS-2014-370.nasl version 1.5. For more plugins, visit the Nessus Plugin Library.

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Amazon Linux AMI : chkrootkit (ALAS-2014-370) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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