Vulnerabilities > CVE-2017-9065 - Improper Input Validation vulnerability in Wordpress

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
PARTIAL
Availability impact
NONE
network
low complexity
wordpress
debian
CWE-20
nessus
NVD
Published: 2017-05-18
Updated: 2019-03-15

Summary

In WordPress before 4.7.5, there is a lack of capability checks for post meta data in the XML-RPC API.

Vulnerable Configurations

Part Description Count
Application
Wordpress
605
OS
Debian
2

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Nessus

  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-975.NASL
    descriptionSeveral vulnerabilities were discovered in wordpress, a web blogging tool. The Common Vulnerabilities and Exposures project identifies the following issues. CVE-2017-8295 Potential unauthorized password reset vulnerability. More information are available at : https://exploitbox.io/vuln/WordPress-Exploit-4-7-Unauth-Password-Reset -0day-CVE-2017-8295.html CVE-2017-9061 A cross-site scripting (XSS) vulnerability exists when someone attempts to upload very large files. CVE-2017-9062 Improper handling of post meta data values in the XML-RPC API. CVE-2017-9063 Cross-site scripting (XSS) vulnerability in the customizer. CVE-2017-9064 A Cross Site Request Forgery (CSRF) vulnerability exists in the filesystem credentials dialog. CVE-2017-9065 Lack of capability checks for post meta data in the XML-RPC API. For Debian 7
    last seen2020-03-17
    modified2017-06-05
    plugin id100602
    published2017-06-05
    reporterThis script is Copyright (C) 2017-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/100602
    titleDebian DLA-975-1 : wordpress security update
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-975-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100602);
  script_version("3.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2017-8295", "CVE-2017-9061", "CVE-2017-9062", "CVE-2017-9063", "CVE-2017-9064", "CVE-2017-9065");

  script_name(english:"Debian DLA-975-1 : 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:
"Several vulnerabilities were discovered in wordpress, a web blogging
tool. The Common Vulnerabilities and Exposures project identifies the
following issues.

CVE-2017-8295

Potential unauthorized password reset vulnerability. More information
are available at :

https://exploitbox.io/vuln/WordPress-Exploit-4-7-Unauth-Password-Reset
-0day-CVE-2017-8295.html

CVE-2017-9061

A cross-site scripting (XSS) vulnerability exists when someone
attempts to upload very large files.

CVE-2017-9062

Improper handling of post meta data values in the XML-RPC API.

CVE-2017-9063

Cross-site scripting (XSS) vulnerability in the customizer.

CVE-2017-9064

A Cross Site Request Forgery (CSRF) vulnerability exists in the
filesystem credentials dialog.

CVE-2017-9065

Lack of capability checks for post meta data in the XML-RPC API.

For Debian 7 'Wheezy', these problems have been fixed in version
3.6.1+dfsg-1~deb7u15.

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."
  );
  # https://exploitbox.io/vuln/WordPress-Exploit-4-7-Unauth-Password-Reset-0day-CVE-2017-8295.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?5a4aa4f1"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2017/06/msg00004.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/wordpress"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Upgrade the affected wordpress, and wordpress-l10n 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:POC/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:P/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:"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:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 Tenable Network Security, Inc.");
  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:"7.0", prefix:"wordpress", reference:"3.6.1+dfsg-1~deb7u15")) flag++;
if (deb_check(release:"7.0", prefix:"wordpress-l10n", reference:"3.6.1+dfsg-1~deb7u15")) 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");
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3870.NASL
    descriptionSeveral vulnerabilities were discovered in wordpress, a web blogging tool. They would allow remote attackers to force password resets, and perform various cross-site scripting and cross-site request forgery attacks.
    last seen2020-06-01
    modified2020-06-02
    plugin id100561
    published2017-06-01
    reporterThis script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/100561
    titleDebian DSA-3870-1 : 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-3870. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100561);
  script_version("3.11");
  script_cvs_date("Date: 2018/11/10 11:49:38");

  script_cve_id("CVE-2017-8295", "CVE-2017-9061", "CVE-2017-9062", "CVE-2017-9063", "CVE-2017-9064", "CVE-2017-9065");
  script_xref(name:"DSA", value:"3870");

  script_name(english:"Debian DSA-3870-1 : 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 would allow remote attackers to force password resets, and
perform various cross-site scripting and cross-site request forgery
attacks."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=862053"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=862816"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/wordpress"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2017/dsa-3870"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the wordpress packages.

For the stable distribution (jessie), these problems have been fixed
in version 4.1+dfsg-1+deb8u14.

For the upcoming stable (stretch) and unstable (sid) distributions,
these problems have been fixed in version 4.7.5+dfsg-1."
  );
  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:POC/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:P/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:"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:8.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/01");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 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+dfsg-1+deb8u14")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-l10n", reference:"4.1+dfsg-1+deb8u14")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-theme-twentyfifteen", reference:"4.1+dfsg-1+deb8u14")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-theme-twentyfourteen", reference:"4.1+dfsg-1+deb8u14")) flag++;
if (deb_check(release:"8.0", prefix:"wordpress-theme-twentythirteen", reference:"4.1+dfsg-1+deb8u14")) 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");
  • NASL familyCGI abuses
    NASL idWORDPRESS_4_7_5.NASL
    descriptionAccording to its self-reported version number, the WordPress application running on the remote web server is prior to 4.7.5. It is, therefore, affected by multiple vulnerabilities : - A DOM-based cross-site scripting (XSS) vulnerability exists in the uploadSizeError() function within file wp-includes/js/plupload/handlers.js when handling overly large file uploads due to improper validation of user-supplied input to file names before returning it in error messages. An unauthenticated, remote attacker can exploit this, via a specially crafted request, to execute arbitrary script code in a user
    last seen2020-06-01
    modified2020-06-02
    plugin id100298
    published2017-05-19
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/100298
    titleWordPress < 4.7.5 Multiple Vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100298);
  script_version("1.8");
  script_cvs_date("Date: 2019/11/13");

  script_cve_id(
    "CVE-2017-9061",
    "CVE-2017-9062",
    "CVE-2017-9063",
    "CVE-2017-9064",
    "CVE-2017-9065",
    "CVE-2017-9066"
  );
  script_bugtraq_id(98509);

  script_name(english:"WordPress < 4.7.5 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 4.7.5.
It is, therefore, affected by multiple vulnerabilities :

  - A DOM-based cross-site scripting (XSS) vulnerability
    exists in the uploadSizeError() function within file
    wp-includes/js/plupload/handlers.js when handling overly
    large file uploads due to improper validation of
    user-supplied input to file names before returning it in
    error messages. An unauthenticated, remote attacker can
    exploit this, via a specially crafted request, to
    execute arbitrary script code in a user's browser
    session. (CVE-2017-9061)

  - A flaw exists in the set_custom_fields() function within
    file wp-includes/class-wp-xmlrpc-server.php when
    accessing post meta data due to improper validation of
    user-supplied input. An authenticated, remote attacker
    can exploit this to gain unauthorized access to meta
    data. (CVE-2017-9062)

  - A stored cross-site scripting (XSS) vulnerability exists
    within file wp-admin/customize.php script due to
    improper validation of user-supplied input to the blog
    name before returning it to users. An authenticated,
    remote attacker can exploit this, via a specially
    crafted request, to execute arbitrary script code in a
    user's browser session. (CVE-2017-9063)

  - A cross-site request forgery (XSRF) vulnerability exists
    in the request_filesystem_credentials() function within
    file /wp-admin/includes/file.php due to a failure to
    require multiple steps, explicit confirmation, or a
    unique token when performing certain sensitive actions.
    An unauthenticated, remote attacker can exploit this,
    by convincing a user to follow a specially crafted link,
    to disclose the user credentials. (CVE-2017-9064)

  - A flaw exists in the XML-RPC API, specifically within
    file wp-includes/class-wp-xmlrpc-server.php in the
    _insert_post() function, when handling post meta data
    due to a lack of capability checks. An unauthenticated,
    remote attacker can exploit this to manipulate posts
    without having the required capabilities.
    (CVE-2017-9065)

  - A flaw exists in the WP_Http::request() function within
    file wp-includes/class-http.php due to improper
    validation of user-supplied iput. An unauthenticated,
    remote attacker can exploit this to redirect the user to
    a URL of the attacker's choosing. (CVE-2017-9066)

Note that Nessus has not tested for these issues but has instead
relied only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://wordpress.org/news/2017/05/wordpress-4-7-5/");
  script_set_attribute(attribute:"see_also", value:"https://codex.wordpress.org/Version_4.7.5");
  script_set_attribute(attribute:"solution", value:
"Upgrade to WordPress version 4.7.5 or later.");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-9064");

  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/05/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/05/19");

  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) 2017-2019 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);

constraints = [
  { "min_version":"2.5", "fixed_version":"3.7.21", "fixed_display" : "3.7.21 / 4.7.5" },
  { "min_version":"3.8", "fixed_version":"3.8.21", "fixed_display" : "3.8.21 / 4.7.5" },
  { "min_version":"3.9", "fixed_version":"3.9.19", "fixed_display" : "3.9.19 / 4.7.5" },
  { "min_version":"4.0", "fixed_version":"4.0.18", "fixed_display" : "4.0.18 / 4.7.5" },
  { "min_version":"4.1", "fixed_version":"4.1.18", "fixed_display" : "4.1.18 / 4.7.5" },
  { "min_version":"4.2", "fixed_version":"4.2.15", "fixed_display" : "4.2.15 / 4.7.5" },
  { "min_version":"4.3", "fixed_version":"4.3.11", "fixed_display" : "4.3.11 / 4.7.5" },
  { "min_version":"4.4", "fixed_version":"4.4.10", "fixed_display" : "4.4.10 / 4.7.5" },
  { "min_version":"4.5", "fixed_version":"4.5.9", "fixed_display" : "4.5.9 / 4.7.5" },
  { "min_version":"4.6", "fixed_version":"4.6.6", "fixed_display" : "4.6.6 / 4.7.5" },
  { "min_version":"4.7", "fixed_version":"4.7.5", "fixed_display" : "4.7.5" }
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_WARNING,
  flags:{xss:TRUE,xsrf:TRUE}
);

References