PHP 5.6.x < 5.6.39 Multiple vulnerabilities - Nessus

High Plugin ID: 119764

This page contains detailed information about the PHP 5.6.x < 5.6.39 Multiple vulnerabilities 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: 119764
Name: PHP 5.6.x < 5.6.39 Multiple vulnerabilities
Filename: php_5_6_39.nasl
Vulnerability Published: 2018-11-14
This Plugin Published: 2018-12-19
Last Modification Time: 2022-04-11
Plugin Version: 1.10
Plugin Type: remote
Plugin Family: CGI abuses
Dependencies: php_version.nasl
Required KB Items [?]: www/PHP

Vulnerability Information

Severity: High
Vulnerability Published: 2018-11-14
Patch Published: 2018-12-06
CVE [?]: CVE-2018-19518, CVE-2018-19935, CVE-2018-20783
CPE [?]: cpe:/a:php:php

Synopsis

An application installed on the remote host is affected by multiple vulnerabilities.

Description

According to its banner, the version of PHP running on the remote web server is 5.6.x prior to 5.6.39. It is, therefore, affected by multiple vulnerabilities:

- An arbitrary command injection vulnerability exists in the imap_open function due to improper filters for mailbox names prior to passing them to rsh or ssh commands. An authenticated, remote attacker can exploit this by sending a specially crafted IMAP server name to cause the execution of arbitrary commands on the target system. (CVE-2018-19518)

- A denial of service (DoS) vulnerability exists in ext/imap/php_imap.c. An unauthenticated, remote attacker can exploit this issue, via an empty string in the message argument to the imap_mail function, to cause the application to stop responding. (CVE-2018-19935)

- A heap buffer over-read exists in the phar_parse_pharfile function. An unauthenticated, remote attacker can exploit this to read allocated or unallocated memory past the actual data when trying to parse a .phar file. (CVE-2018-20783)

Solution

Upgrade to PHP version 5.6.39 or later.

Public Exploits

Target Network Port(s): 80
Target Asset(s): Services/www
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 PHP 5.6.x < 5.6.39 Multiple vulnerabilities vulnerability:

Metasploit: exploit/linux/http/php_imap_open_rce
[php imap_open Remote Code Execution]
Exploit-DB: exploits/linux/remote/45914.rb
[EDB-45914: PHP imap_open - Remote Code Execution (Metasploit)]
GitHub: https://github.com/HacTF/poc--exp
[CVE-2018-19518]
GitHub: https://github.com/SexyBeast233/SecBooks
[CVE-2018-19518]
GitHub: https://github.com/jiangsir404/POC-S
[CVE-2018-19518]
GitHub: https://github.com/wateroot/poc-exp
[CVE-2018-19518]
GitHub: https://github.com/wrlu/Vulnerabilities
[CVE-2018-19518]
GitHub: https://github.com/ensimag-security/CVE-2018-19518
[CVE-2018-19518: Some works on CVE-2018-19518]

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-2018-19518
CVSS V2 Vector: AV:N/AC:M/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	8.5 (High)
Impact Subscore:	10.0
Exploitability Subscore:	6.8
CVSS Temporal Score:	7.0 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.0 (High)

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

CVSS Base Score:	7.5 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.6
CVSS Temporal Score:	7.0 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.0 (High)

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(119764);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2018-19518", "CVE-2018-19935", "CVE-2018-20783");
  script_bugtraq_id(106018, 106143, 107121);

  script_name(english:"PHP 5.6.x < 5.6.39 Multiple vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote host is affected by
 multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of PHP running on the remote web
server is 5.6.x prior to 5.6.39. It is, therefore, affected by
multiple vulnerabilities:

  - An arbitrary command injection vulnerability exists in the
  imap_open function due to improper filters for mailbox names prior
  to passing them to rsh or ssh commands. An authenticated, remote
  attacker can exploit this by sending a specially crafted IMAP server
  name to cause the execution of arbitrary commands on the target
  system. (CVE-2018-19518)

  - A denial of service (DoS) vulnerability exists in
  ext/imap/php_imap.c. An unauthenticated, remote attacker can
  exploit this issue, via an empty string in the message argument
  to the imap_mail function, to cause the application to stop
  responding. (CVE-2018-19935)

  - A heap buffer over-read exists in the phar_parse_pharfile function.
  An unauthenticated, remote attacker can exploit this to read
  allocated or unallocated memory past the actual data when trying to
  parse a .phar file. (CVE-2018-20783)");
  script_set_attribute(attribute:"see_also", value:"http://php.net/ChangeLog-5.php#5.6.39");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 5.6.39 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/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:N/AC:H/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:"cvss_score_source", value:"CVE-2018-19518");

  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:'php imap_open Remote Code Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/11/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/19");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:php:php");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("php_version.nasl");
  script_require_keys("www/PHP");
  script_require_ports("Services/www", 80);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("webapp_func.inc");

port = get_http_port(default:80, php:TRUE);

php = get_php_from_kb(
  port : port,
  exit_on_fail : TRUE
);

version = php["ver"];
source = php["src"];

backported = get_kb_item('www/php/'+port+'/'+version+'/backported');

if (report_paranoia < 2 && backported)
  audit(AUDIT_BACKPORT_SERVICE, port, "PHP "+version+" install");

# Check that it is the correct version of PHP
if (version =~ "^5(\.6)?$") audit(AUDIT_VER_NOT_GRANULAR, "PHP", port, version);
if (version !~ "^5\.6\.") audit(AUDIT_NOT_DETECT, "PHP version 5.6.x", port);

fix = "5.6.39";
if (ver_compare(ver:version, fix:fix, strict:FALSE) < 0)
{
  report =
    '\n  Version source    : ' + source +
    '\n  Installed version : ' + version +
    '\n  Fixed version     : ' + fix +
    '\n';
  security_report_v4(port:port, extra:report, severity:SECURITY_HOLE );
}
else audit(AUDIT_LISTEN_NOT_VULN, "PHP", port, version);

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/php_5_6_39.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\php_5_6_39.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/php_5_6_39.nasl

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How to Run

Here is how to run the PHP 5.6.x < 5.6.39 Multiple vulnerabilities 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 CGI abuses plugin family.
On the right side table select PHP 5.6.x < 5.6.39 Multiple vulnerabilities plugin ID 119764.
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 php_5_6_39.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a php_5_6_39.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - php_5_6_39.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 php_5_6_39.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

106018, 106143, 107121

See also:

Similar and related Nessus plugins:

145814 - CentOS 8 : php:7.2 (CESA-2020:1624)
122821 - PHP 7.0.x < 7.0.33 Multiple vulnerabilities
119765 - PHP 7.1.x < 7.1.25 Multiple vulnerabilities
121510 - PHP 7.1.x < 7.1.26 Multiple vulnerabilities.
119766 - PHP 7.2.x < 7.2.13 Multiple vulnerabilities
121353 - PHP 7.2.x < 7.2.14 Multiple vulnerabilities.
111217 - PHP 7.3.0 [alpha
136057 - RHEL 8 : php:7.2 (RHSA-2020:1624)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file php_5_6_39.nasl version 1.10. For more plugins, visit the Nessus Plugin Library.

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PHP 5.6.x < 5.6.39 Multiple vulnerabilities - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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