Debian DLA-1742-1 : wordpress security update - Nessus

High Plugin ID: 123529

This page contains detailed information about the Debian DLA-1742-1 : wordpress security update 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: 123529
Name: Debian DLA-1742-1 : wordpress security update
Filename: debian_DLA-1742.nasl
Vulnerability Published: 2019-02-20
This Plugin Published: 2019-04-01
Last Modification Time: 2021-01-11
Plugin Version: 1.7
Plugin Type: local
Plugin Family: Debian Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Debian/dpkg-l, Host/Debian/release, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2019-02-20
Patch Published: 2019-03-31
CVE [?]: CVE-2019-8942, CVE-2019-9787
CPE [?]: cpe:/o:debian:debian_linux:8.0, p-cpe:/a:debian:debian_linux:wordpress, p-cpe:/a:debian:debian_linux:wordpress-l10n, p-cpe:/a:debian:debian_linux:wordpress-theme-twentyfifteen, p-cpe:/a:debian:debian_linux:wordpress-theme-twentyfourteen, p-cpe:/a:debian:debian_linux:wordpress-theme-twentythirteen

Synopsis

The remote Debian host is missing a security update.

Description

Simon Scannell of Ripstech Technologies discovered multiple vulnerabilities in wordpress, a web blogging manager.

CVE-2019-8942

remote code execution in wordpress because an _wp_attached_file Post Meta entry can be changed to an arbitrary string, such as one ending with a .jpg?file.php substring. An attacker with author privileges can execute arbitrary code by uploading a crafted image containing PHP code in the Exif metadata.

CVE-2019-9787

wordpress does not properly filter comment content, leading to Remote Code Execution by unauthenticated users in a default configuration. This occurs because CSRF protection is mishandled, and because Search Engine Optimization of A elements is performed incorrectly, leading to XSS. The XSS results in administrative access.

For Debian 8 'Jessie', these problems have been fixed in version 4.1.26+dfsg-1+deb8u1.

We recommend that you upgrade your wordpress packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

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 Debian DLA-1742-1 : wordpress security update vulnerability:

Metasploit: exploit/multi/http/wp_crop_rce
[WordPress Crop-image Shell Upload]
Exploit-DB: exploits/php/remote/46662.rb
[EDB-46662: WordPress Core 5.0.0 - Crop-image Shell Upload (Metasploit)]
GitHub: https://github.com/El-Palomo/DerpNStink
[CVE-2019-8942]
GitHub: https://github.com/v0lck3r/CVE-2019-8943
[CVE-2019-8942: Exploit of CVE-2019-8942 and CVE-2019-8943]
GitHub: https://github.com/El-Palomo/DerpNStink
[CVE-2019-9787]
GitHub: https://github.com/dexXxed/CVE-2019-9787
[CVE-2019-9787: Overview PoC of CSRF CVE-2019-9787 WordPress Version 5.1.1]
GitHub: https://github.com/kuangting4231/mitigation-cve-2019-9787
[CVE-2019-9787]
GitHub: https://github.com/rkatogit/cve-2019-9787_csrf_poc
[CVE-2019-9787]
GitHub: https://github.com/smfils1/Cybersecurity-WordPress-Pentesting
[CVE-2019-9787]
GitHub: https://github.com/who909/WordPress-vs.-Kali
[CVE-2019-9787]
GitHub: https://github.com/brianwrf/WordPress_4.9.8_RCE_POC
[CVE-2019-8942: A simple PoC for WordPress RCE (author priviledge), refer to CVE-2019-8942 and ...]
GitHub: https://github.com/synacktiv/CVE-2019-8942
[CVE-2019-8942: WordPress crop-image exploitation]
GitHub: https://github.com/matinciel/Wordpress_CVE-2019-9787
[CVE-2019-9787: Try to reproduce this issue with Docker]
GitHub: https://github.com/PalmTreeForest/CodePath_Week_7-8
[CVE-2019-9787: CodePath Assignment for Weeks 7 & 8: CVE-2017-14719, CVE-2019-9787 & Unauthenticated ...]
GitHub: https://github.com/sijiahi/Wordpress_cve-2019-9787_defense
[CVE-2019-9787: This is a recurrence of cve-2019-9787 on Wordpress and a hash-based defense.]
GitHub: https://github.com/synod2/WP_CROP_RCE
[CVE-2019-8942: Cve-2019-8942, cve-2019-8943]

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-2019-9787
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:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	8.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.2 (High)

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1742-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(123529);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2019-8942", "CVE-2019-9787");

  script_name(english:"Debian DLA-1742-1 : wordpress security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Simon Scannell of Ripstech Technologies discovered multiple
vulnerabilities in wordpress, a web blogging manager.

CVE-2019-8942

remote code execution in wordpress because an _wp_attached_file Post
Meta entry can be changed to an arbitrary string, such as one ending
with a .jpg?file.php substring. An attacker with author privileges can
execute arbitrary code by uploading a crafted image containing PHP
code in the Exif metadata.

CVE-2019-9787

wordpress does not properly filter comment content, leading to Remote
Code Execution by unauthenticated users in a default configuration.
This occurs because CSRF protection is mishandled, and because Search
Engine Optimization of A elements is performed incorrectly, leading to
XSS. The XSS results in administrative access.

For Debian 8 'Jessie', these problems have been fixed in version
4.1.26+dfsg-1+deb8u1.

We recommend that you upgrade your wordpress packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2019/03/msg00044.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/wordpress"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  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:N/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-2019-9787");
  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:'WordPress Crop-image Shell Upload');
  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:debian:debian_linux:wordpress");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:wordpress-l10n");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:wordpress-theme-twentyfifteen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:wordpress-theme-twentyfourteen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:wordpress-theme-twentythirteen");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/02/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/04/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"8.0", prefix:"wordpress", reference:"4.1.26+dfsg-1+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-l10n", reference:"4.1.26+dfsg-1+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-theme-twentyfifteen", reference:"4.1.26+dfsg-1+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-theme-twentyfourteen", reference:"4.1.26+dfsg-1+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-theme-twentythirteen", reference:"4.1.26+dfsg-1+deb8u1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/debian_DLA-1742.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\debian_DLA-1742.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/debian_DLA-1742.nasl

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How to Run

Here is how to run the Debian DLA-1742-1 : wordpress security update 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 Debian Local Security Checks plugin family.
On the right side table select Debian DLA-1742-1 : wordpress security update plugin ID 123529.
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 debian_DLA-1742.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a debian_DLA-1742.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - debian_DLA-1742.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 debian_DLA-1742.nasl -t <IP/HOST>

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References

See also:

Similar and related Nessus plugins:

122551 - Debian DSA-4401-1 : wordpress - security update
136373 - Debian DSA-4677-1 : wordpress - security update
122823 - WordPress < 5.1.1 Multiple Vulnerabilities

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file debian_DLA-1742.nasl version 1.7. For more plugins, visit the Nessus Plugin Library.

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Debian DLA-1742-1 : wordpress security update - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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