Amazon Linux AMI : php7-pear (ALAS-2021-1466) - Nessus

High Plugin ID: 145000

This page contains detailed information about the Amazon Linux AMI : php7-pear (ALAS-2021-1466) 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: 145000
Name: Amazon Linux AMI : php7-pear (ALAS-2021-1466)
Filename: ala_ALAS-2021-1466.nasl
Vulnerability Published: 2020-11-19
This Plugin Published: 2021-01-14
Last Modification Time: 2021-02-25
Plugin Version: 1.4
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: High
Vulnerability Published: 2020-11-19
Patch Published: 2021-01-12
CVE [?]: CVE-2020-28948, CVE-2020-28949
CPE [?]: cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:php7-pear

Synopsis

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

Description

The version of php7-pear installed on the remote host is prior to 1.10.12-4.30. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1466 advisory.

- Archive_Tar through 1.4.10 allows an unserialization attack because phar: is blocked but PHAR: is not blocked. (CVE-2020-28948)

- Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed. (CVE-2020-28949)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update php7-pear' to update your system.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Amazon Linux AMI : php7-pear (ALAS-2021-1466) vulnerability:

Metasploit: exploit/multi/fileformat/archive_tar_arb_file_write
[PEAR Archive_Tar 1.4.10 Arbitrary File Write]
GitHub: https://github.com/0x240x23elu/CVE-2020-28948-and-CVE-2020-28949
[CVE-2020-28948]
GitHub: https://github.com/nopdata/cve-2020-28948
[CVE-2020-28948]
GitHub: https://github.com/pear/Archive_Tar/issues/33
[CVE-2020-28948]
GitHub: https://github.com/0x240x23elu/CVE-2020-28948-and-CVE-2020-28949
[CVE-2020-28949]
GitHub: https://github.com/pear/Archive_Tar/issues/33
[CVE-2020-28949]

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 Score Source [?]: CVE-2020-28949
CVSS V2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:C

CVSS Base Score:	6.8 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	8.6
CVSS Temporal Score:	5.6 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.6 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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-2021-1466.
##

include('compat.inc');

if (description)
{
  script_id(145000);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/02/25");

  script_cve_id("CVE-2020-28948", "CVE-2020-28949");
  script_xref(name:"ALAS", value:"2021-1466");

  script_name(english:"Amazon Linux AMI : php7-pear (ALAS-2021-1466)");
  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 version of php7-pear installed on the remote host is prior to 1.10.12-4.30. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS-2021-1466 advisory.

  - Archive_Tar through 1.4.10 allows an unserialization attack because phar: is blocked but PHAR: is not
    blocked. (CVE-2020-28948)

  - Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other
    stream-wrapper attack (such as file:// to overwrite files) can still succeed. (CVE-2020-28949)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/ALAS-2021-1466.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-28948");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-28949");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update php7-pear' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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:N/UI:R/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:"cvss_score_source", value:"CVE-2020-28949");

  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:'PEAR Archive_Tar 1.4.10 Arbitrary File Write');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/11/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/01/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:php7-pear");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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);

pkgs = [
    {'reference':'php7-pear-1.10.12-4.30.amzn1', 'release':'ALA'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  allowmaj = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (reference && release) {
    if (rpm_check(release:release, cpu:cpu, reference:reference, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "php7-pear");
}

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-2021-1466.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ala_ALAS-2021-1466.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ala_ALAS-2021-1466.nasl

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How to Run

Here is how to run the Amazon Linux AMI : php7-pear (ALAS-2021-1466) 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 : php7-pear (ALAS-2021-1466) plugin ID 145000.
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-2021-1466.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ala_ALAS-2021-1466.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-2021-1466.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-2021-1466.nasl -t <IP/HOST>

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References

ALAS | Amazon Linux Security Advisory:

2021-1466

See also:

Similar and related Nessus plugins:

144803 - Amazon Linux 2 : php-pear (ALAS-2021-1584)
143336 - Debian DLA-2466-1 : drupal7 security update
144483 - Debian DSA-4817-1 : php-pear - security update
143274 - Drupal 7.x < 7.75 / 8.x < 8.8.12 / 8.9.x < 8.9.10 / 9.0.x < 9.0.9 Multiple Vulnerabilities (SA-CORE-2020-013)
145139 - EulerOS 2.0 SP3 : php-pear (EulerOS-SA-2021-1111)
145766 - EulerOS 2.0 SP8 : php-pear (EulerOS-SA-2021-1164)
146706 - EulerOS 2.0 SP2 : php-pear (EulerOS-SA-2021-1345)
143436 - Fedora 32 : 1:php-pear (2020-5271a896ff)
144225 - Fedora 33 : drupal8 (2020-6f1079934c)
144247 - Fedora 32 : drupal8 (2020-d50d74d6f2)
143438 - Fedora 33 : 1:php-pear (2020-f351eb14e3)
145432 - GLSA-202101-23 : PEAR Archive_Tar: Directory traversal
143428 - Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : PEAR vulnerabilities (USN-4654-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ala_ALAS-2021-1466.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

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Amazon Linux AMI : php7-pear (ALAS-2021-1466) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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