Vulnerabilities > CVE-2018-20148 - Deserialization of Untrusted Data vulnerability in Wordpress

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
low complexity
wordpress
debian
CWE-502
nessus

Summary

In WordPress before 4.9.9 and 5.x before 5.0.1, contributors could conduct PHP object injection attacks via crafted metadata in a wp.getMediaItem XMLRPC call. This is caused by mishandling of serialized data at phar:// URLs in the wp_get_attachment_thumb_file function in wp-includes/post.php.

Vulnerable Configurations

Part Description Count
Application
Wordpress
677
OS
Debian
2

Common Weakness Enumeration (CWE)

Nessus

  • NASL familyCGI abuses
    NASL idWORDPRESS_5_0_1.NASL
    descriptionAccording to its self-reported version number, the WordPress application running on the remote web server is prior to 4.9.9, or 5.x prior to 5.0.1. It is, therefore, affected by multiple vulnerabilities, including cross-site scripting (XSS) vulnerabilities due to improper validation of user-supplied input before returning it to users.
    last seen2020-04-30
    modified2018-12-13
    plugin id119615
    published2018-12-13
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119615
    titleWordPress < 4.9.9 / 5.x < 5.0.1 Multiple Vulnerabilities
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(119615);
      script_version("1.6");
      script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/27");
    
      script_cve_id(
        "CVE-2018-20147",
        "CVE-2018-20148",
        "CVE-2018-20149",
        "CVE-2018-20150",
        "CVE-2018-20151",
        "CVE-2018-20152",
        "CVE-2018-20153"
      );
    
      script_name(english:"WordPress < 4.9.9 / 5.x < 5.0.1 Multiple Vulnerabilities");
      script_summary(english:"Checks the version of WordPress.");
    
      script_set_attribute(attribute:"synopsis", value:
    "A PHP application running on the remote web server is affected by
    multiple vulnerabilities.");
      script_set_attribute(attribute:"description", value:
    "According to its self-reported version number, the WordPress
    application running on the remote web server is prior to 4.9.9, or
    5.x prior to 5.0.1. It is, therefore, affected by multiple
    vulnerabilities, including cross-site scripting (XSS) vulnerabilities
    due to improper validation of user-supplied input before returning
    it to users.");
      # https://wordpress.org/news/2018/12/wordpress-5-0-1-security-release/
      script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b90fd4fc");
      script_set_attribute(attribute:"solution", value:
    "Upgrade to WordPress version 4.9.9 or 5.0.1 or later.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
      script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-20148");
    
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/13");
      script_set_attribute(attribute:"patch_publication_date", value:"2018/12/13");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/13");
    
      script_set_attribute(attribute:"potential_vulnerability", value:"true");
      script_set_attribute(attribute:"plugin_type", value:"remote");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:wordpress:wordpress");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_family(english:"CGI abuses");
    
      script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
    
      script_dependencies("wordpress_detect.nasl");
      script_require_keys("www/PHP", "installed_sw/WordPress", "Settings/ParanoidReport");
      script_require_ports("Services/www", 80, 443);
    
      exit(0);
    }
    
    include("vcf.inc");
    include("http.inc");
    
    if (report_paranoia < 2) audit(AUDIT_PARANOID);
    
    app = "WordPress";
    port = get_http_port(default:80, php:TRUE);
    
    app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);
    vcf::check_granularity(app_info:app_info, sig_segments:2);
    
    # Per https://wordpress.org/download/release-archive/
    # only 5.x is currently supported :
    # "None of these are safe to use, except the latest in the 5.0 series, which is actively maintained."
    constraints = [
      { "fixed_version":"3.7.28", "fixed_display" : "3.7.28 / 5.0.1" },
      { "min_version":"3.8", "fixed_version":"3.8.28", "fixed_display" : "3.8.28 / 5.0.1" },
      { "min_version":"3.9", "fixed_version":"3.9.26", "fixed_display" : "3.9.26 / 5.0.1" },
      { "min_version":"4.0", "fixed_version":"4.0.25", "fixed_display" : "4.0.25 / 5.0.1" },
      { "min_version":"4.1", "fixed_version":"4.1.25", "fixed_display" : "4.1.25 / 5.0.1" },
      { "min_version":"4.2", "fixed_version":"4.2.22", "fixed_display" : "4.2.22 / 5.0.1" },
      { "min_version":"4.3", "fixed_version":"4.3.18", "fixed_display" : "4.3.18 / 5.0.1" },
      { "min_version":"4.4", "fixed_version":"4.4.17", "fixed_display" : "4.4.17 / 5.0.1" },
      { "min_version":"4.5", "fixed_version":"4.5.16", "fixed_display" : "4.5.16 / 5.0.1" },
      { "min_version":"4.6", "fixed_version":"4.6.13", "fixed_display" : "4.6.13 / 5.0.1" },
      { "min_version":"4.7", "fixed_version":"4.7.12", "fixed_display" : "4.7.12 / 5.0.1" },
      { "min_version":"4.8", "fixed_version":"4.8.8", "fixed_display" : "4.8.8 / 5.0.1" },
      { "min_version":"4.9", "fixed_version":"4.9.9", "fixed_display" : "4.9.9 / 5.0.1" },
      { "min_version":"5.0", "fixed_version":"5.0.1", "fixed_display" : "5.0.1" }
    ];
    
    vcf::check_version_and_report(
      app_info:app_info,
      constraints:constraints,
      severity:SECURITY_HOLE,
      flags:{xss:TRUE}
    );
    
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-4401.NASL
    descriptionSeveral vulnerabilities were discovered in Wordpress, a web blogging tool. They allowed remote attackers to perform various Cross-Side Scripting (XSS) and PHP injections attacks, delete files, leak potentially sensitive data, create posts of unauthorized types, or cause denial-of-service by application crash.
    last seen2020-06-01
    modified2020-06-02
    plugin id122551
    published2019-03-04
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122551
    titleDebian DSA-4401-1 : wordpress - security update
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Debian Security Advisory DSA-4401. The text 
    # itself is copyright (C) Software in the Public Interest, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(122551);
      script_version("1.4");
      script_cvs_date("Date: 2019/04/10 16:10:16");
    
      script_cve_id("CVE-2018-20147", "CVE-2018-20148", "CVE-2018-20149", "CVE-2018-20150", "CVE-2018-20151", "CVE-2018-20152", "CVE-2018-20153", "CVE-2019-8942");
      script_xref(name:"DSA", value:"4401");
    
      script_name(english:"Debian DSA-4401-1 : wordpress - security update");
      script_summary(english:"Checks dpkg output for the updated package");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Debian host is missing a security-related update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Several vulnerabilities were discovered in Wordpress, a web blogging
    tool. They allowed remote attackers to perform various Cross-Side
    Scripting (XSS) and PHP injections attacks, delete files, leak
    potentially sensitive data, create posts of unauthorized types, or
    cause denial-of-service by application crash."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916403"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://security-tracker.debian.org/tracker/source-package/wordpress"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://packages.debian.org/source/stretch/wordpress"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.debian.org/security/2019/dsa-4401"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "Upgrade the wordpress packages.
    
    For the stable distribution (stretch), these problems have been fixed
    in version 4.7.5+dfsg-2+deb9u5."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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: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:'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:"cpe:/o:debian:debian_linux:9.0");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/14");
      script_set_attribute(attribute:"patch_publication_date", value:"2019/03/01");
      script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/04");
      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 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:"9.0", prefix:"wordpress", reference:"4.7.5+dfsg-2+deb9u5")) flag++;
    if (deb_check(release:"9.0", prefix:"wordpress-l10n", reference:"4.7.5+dfsg-2+deb9u5")) flag++;
    if (deb_check(release:"9.0", prefix:"wordpress-theme-twentyfifteen", reference:"4.7.5+dfsg-2+deb9u5")) flag++;
    if (deb_check(release:"9.0", prefix:"wordpress-theme-twentyseventeen", reference:"4.7.5+dfsg-2+deb9u5")) flag++;
    if (deb_check(release:"9.0", prefix:"wordpress-theme-twentysixteen", reference:"4.7.5+dfsg-2+deb9u5")) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
      else security_hole(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1673.NASL
    descriptionCVE-2018-20147 Authors could modify metadata to bypass intended restrictions on deleting files. CVE-2018-20148 Contributors could conduct PHP object injection attacks via crafted metadata in a wp.getMediaItem XMLRPC call. This is caused by mishandling of serialized data at phar:// URLs in the wp_get_attachment_thumb_file function in wp-includes/post.php. CVE-2018-20149 When the Apache HTTP Server is used, authors could upload crafted files that bypass intended MIME type restrictions, leading to XSS, as demonstrated by a .jpg file without JPEG data. CVE-2018-20150 Crafted URLs could trigger XSS for certain use cases involving plugins. CVE-2018-20151 The user-activation page could be read by a search engine
    last seen2020-06-01
    modified2020-06-02
    plugin id122100
    published2019-02-12
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/122100
    titleDebian DLA-1673-1 : wordpress security update
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from Debian Security Advisory DLA-1673-1. The text
    # itself is copyright (C) Software in the Public Interest, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(122100);
      script_version("1.2");
      script_cvs_date("Date: 2020/02/13");
    
      script_cve_id("CVE-2018-20147", "CVE-2018-20148", "CVE-2018-20149", "CVE-2018-20150", "CVE-2018-20151", "CVE-2018-20152", "CVE-2018-20153");
    
      script_name(english:"Debian DLA-1673-1 : 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:
    "CVE-2018-20147
    
    Authors could modify metadata to bypass intended restrictions on
    deleting files.
    
    CVE-2018-20148 Contributors could conduct PHP object injection attacks
    via crafted metadata in a wp.getMediaItem XMLRPC call. This is caused
    by mishandling of serialized data at phar:// URLs in the
    wp_get_attachment_thumb_file function in wp-includes/post.php.
    
    CVE-2018-20149
    
    When the Apache HTTP Server is used, authors could upload crafted
    files that bypass intended MIME type restrictions, leading to XSS, as
    demonstrated by a .jpg file without JPEG data.
    
    CVE-2018-20150
    
    Crafted URLs could trigger XSS for certain use cases involving
    plugins.
    
    CVE-2018-20151
    
    The user-activation page could be read by a search engine's web
    crawler if an unusual configuration were chosen. The search engine
    could then index and display a user's e-mail address and (rarely) the
    password that was generated by default.
    
    CVE-2018-20152
    
    Authors could bypass intended restrictions on post types via crafted
    input.
    
    CVE-2018-20153
    
    Contributors could modify new comments made by users with greater
    privileges, possibly causing XSS.
    
    For Debian 8 'Jessie', these problems have been fixed in version
    4.1.25+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/2019/02/msg00019.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:L/Au:N/C:P/I:P/A:P");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
    
      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:"2018/12/14");
      script_set_attribute(attribute:"patch_publication_date", value:"2019/02/11");
      script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/12");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2019-2020 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:"4.1.25+dfsg-1+deb8u1")) flag++;
    if (deb_check(release:"8.0", prefix:"wordpress-l10n", reference:"4.1.25+dfsg-1+deb8u1")) flag++;
    if (deb_check(release:"8.0", prefix:"wordpress-theme-twentyfifteen", reference:"4.1.25+dfsg-1+deb8u1")) flag++;
    if (deb_check(release:"8.0", prefix:"wordpress-theme-twentyfourteen", reference:"4.1.25+dfsg-1+deb8u1")) flag++;
    if (deb_check(release:"8.0", prefix:"wordpress-theme-twentythirteen", reference:"4.1.25+dfsg-1+deb8u1")) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
      else security_hole(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");