Vulnerabilities > CVE-2017-1000356 - Cross-Site Request Forgery (CSRF) vulnerability in Jenkins

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
jenkins
CWE-352
nessus
NVD
Published: 2018-01-29
Updated: 2018-02-15

Summary

Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an issue in the Jenkins user database authentication realm: create an account if signup is enabled; or create an account if the victim is an administrator, possibly deleting the existing default admin user in the process and allowing a wide variety of impacts.

Vulnerable Configurations

Part Description Count
Application
Jenkins
1550

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • JSON Hijacking (aka JavaScript Hijacking)
    An attacker targets a system that uses JavaScript Object Notation (JSON) as a transport mechanism between the client and the server (common in Web 2.0 systems using AJAX) to steal possibly confidential information transmitted from the server back to the client inside the JSON object by taking advantage of the loophole in the browser's Same Origin Policy that does not prohibit JavaScript from one website to be included and executed in the context of another website. An attacker gets the victim to visit his or her malicious page that contains a script tag whose source points to the vulnerable system with a URL that requests a response from the server containing a JSON object with possibly confidential information. The malicious page also contains malicious code to capture the JSON object returned by the server before any other processing on it can take place, typically by overriding the JavaScript function used to create new objects. This hook allows the malicious code to get access to the creation of each object and transmit the possibly sensitive contents of the captured JSON object to the attackers' server. There is nothing in the browser's security model to prevent the attackers' malicious JavaScript code (originating from attacker's domain) to set up an environment (as described above) to intercept a JSON object response (coming from the vulnerable target system's domain), read its contents and transmit to the attackers' controlled site. The same origin policy protects the domain object model (DOM), but not the JSON.
  • Cross-Domain Search Timing
    An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain. For GET requests an attacker could for instance leverage the "img" tag in conjunction with "onload() / onerror()" javascript events. For the POST requests, an attacker could leverage the "iframe" element and leverage the "onload()" event. There is nothing in the current browser security model that prevents an attacker to use these methods to time responses to the attackers' cross domain requests. The timing for these responses leaks information. For instance, if a victim has an active session with their online e-mail account, an attacker could issue search requests in the victim's mailbox. While the attacker is not able to view the responses, based on the timings of the responses, the attacker could ask yes / no questions as to the content of victim's e-mails, who the victim e-mailed, when, etc. This is but one example; There are other scenarios where an attacker could infer potentially sensitive information from cross domain requests by timing the responses while asking the right questions that leak information.
  • Cross Site Identification
    An attacker harvests identifying information about a victim via an active session that the victim's browser has with a social networking site. A victim may have the social networking site open in one tab or perhaps is simply using the "remember me" feature to keep his or her session with the social networking site active. An attacker induces a payload to execute in the victim's browser that transparently to the victim initiates a request to the social networking site (e.g., via available social network site APIs) to retrieve identifying information about a victim. While some of this information may be public, the attacker is able to harvest this information in context and may use it for further attacks on the user (e.g., spear phishing). In one example of an attack, an attacker may post a malicious posting that contains an image with an embedded link. The link actually requests identifying information from the social networking site. A victim who views the malicious posting in his or her browser will have sent identifying information to the attacker, as long as the victim had an active session with the social networking site. There are many other ways in which the attacker may get the payload to execute in the victim's browser mainly by finding a way to hide it in some reputable site that the victim visits. The attacker could also send the link to the victim in an e-mail and trick the victim into clicking on the link. This attack is basically a cross site request forgery attack with two main differences. First, there is no action that is performed on behalf of the user aside from harvesting information. So standard CSRF protection may not work in this situation. Second, what is important in this attack pattern is the nature of the data being harvested, which is identifying information that can be obtained and used in context. This real time harvesting of identifying information can be used as a prelude for launching real time targeted social engineering attacks on the victim.
  • Cross Site Request Forgery (aka Session Riding)
    An attacker crafts malicious web links and distributes them (via web pages, email, etc.), typically in a targeted manner, hoping to induce users to click on the link and execute the malicious action against some third-party application. If successful, the action embedded in the malicious link will be processed and accepted by the targeted application with the users' privilege level. This type of attack leverages the persistence and implicit trust placed in user session cookies by many web applications today. In such an architecture, once the user authenticates to an application and a session cookie is created on the user's system, all following transactions for that session are authenticated using that cookie including potential actions initiated by an attacker and simply "riding" the existing session cookie.

Nessus

  • NASL familyCGI abuses
    NASL idJENKINS_2_57.NASL
    descriptionThe version of Jenkins running on the remote web server is prior to 2.57 or is a version of Jenkins LTS prior to 2.46.2, or else it is a version of Jenkins Enterprise that is 1.625.x.y prior to 1.625.24.1, 1.651.x.y prior to 1.651.24.1, 2.7.x.0.y prior to 2.7.24.0.1, or 2.x.y.z prior to 2.46.2.1. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists within core/src/main/java/jenkins/model/Jenkins.java that allows an untrusted serialized Java SignedObject to be transfered to the remoting-based Jenkins CLI and deserialized using a new ObjectInputStream. By using a specially crafted request, an unauthenticated, remote attacker can exploit this issue to bypass existing blacklist protection mechanisms and execute arbitrary code. (CVE-2017-1000353) - A flaw exists in the remoting-based CLI, specifically in the ClientAuthenticationCache.java class, when storing the encrypted username of a successfully authenticated user in a cache file that is used to authenticate further commands. An authenticated, remote attacker who has sufficient permissions to create secrets in Jenkins and download their encrypted values can exploit this issue to impersonate any other Jenkins user on the same instance. (CVE-2017-1000354) - A denial of service vulnerability exists in the XStream library. An authenticated, remote attacker who has sufficient permissions, such as creating or configuring items, views or jobs, can exploit this to crash the Java process by using specially crafted XML content. (CVE-2017-1000355) - Cross-site request forgery (XSRF) vulnerabilities exist within multiple Java classes 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 these to perform several administrative actions by convincing a user into opening a specially crafted web page. (CVE-2017-1000356) Note that Nessus has not tested for these issues but has instead relied only on the application
    last seen2020-06-01
    modified2020-06-02
    plugin id99984
    published2017-05-04
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/99984
    titleJenkins < 2.46.2 / 2.57 and Jenkins Enterprise < 1.625.24.1 / 1.651.24.1 / 2.7.24.0.1 / 2.46.2.1 Multiple Vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(99984);
  script_version("1.8");
  script_cvs_date("Date: 2019/11/13");

  script_cve_id(
    "CVE-2017-1000353",
    "CVE-2017-1000354",
    "CVE-2017-1000355",
    "CVE-2017-1000356"
  );
  script_bugtraq_id(
    98056,
    98062,
    98065,
    98066
  );

  script_name(english:"Jenkins < 2.46.2 / 2.57 and Jenkins Enterprise < 1.625.24.1 / 1.651.24.1 / 2.7.24.0.1 / 2.46.2.1 Multiple Vulnerabilities");
  script_summary(english:"Checks the Jenkins version.");

  script_set_attribute(attribute:"synopsis", value:
"A job scheduling and management system hosted on the remote web server
is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Jenkins running on the remote web server is prior to
2.57 or is a version of Jenkins LTS prior to 2.46.2, or else it is
a version of Jenkins Enterprise that is 1.625.x.y prior to 1.625.24.1,
1.651.x.y prior to 1.651.24.1, 2.7.x.0.y prior to 2.7.24.0.1, or
2.x.y.z prior to 2.46.2.1. It is, therefore, affected by multiple
vulnerabilities :

  - A remote code execution vulnerability exists within
    core/src/main/java/jenkins/model/Jenkins.java that
    allows an untrusted serialized Java SignedObject to be
    transfered to the remoting-based Jenkins CLI and
    deserialized using a new ObjectInputStream. By using a
    specially crafted request, an unauthenticated, remote
    attacker can exploit this issue to bypass existing
    blacklist protection mechanisms and execute arbitrary
    code. (CVE-2017-1000353)

  - A flaw exists in the remoting-based CLI, specifically in
    the ClientAuthenticationCache.java class, when storing
    the encrypted username of a successfully authenticated
    user in a cache file that is used to authenticate
    further commands. An authenticated, remote attacker who
    has sufficient permissions to create secrets in Jenkins
    and download their encrypted values can exploit this
    issue to impersonate any other Jenkins user on the same
    instance. (CVE-2017-1000354)

  - A denial of service vulnerability exists in the XStream
    library. An authenticated, remote attacker who has
    sufficient permissions, such as creating or configuring
    items, views or jobs, can exploit this to crash the Java
    process by using specially crafted XML content.
    (CVE-2017-1000355)

  - Cross-site request forgery (XSRF) vulnerabilities exist
    within multiple Java classes 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 these to
    perform several administrative actions by convincing a
    user into opening a specially crafted web page.
    (CVE-2017-1000356)

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://www.cloudbees.com/cloudbees-security-advisory-2017-04-26");
  script_set_attribute(attribute:"see_also", value:"https://jenkins.io/security/advisory/2017-04-26/");
  # https://foxglovesecurity.com/2015/11/06/what-do-weblogic-websphere-jboss-jenkins-opennms-and-your-application-have-in-common-this-vulnerability/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9c6d83db");
  script_set_attribute(attribute:"solution", value:
"Upgrade Jenkins to version 2.57 or later, Jenkins LTS to version
2.46.2 or later, or Jenkins Enterprise to version 1.625.24.1 /
1.651.24.1 / 2.7.24.0.1 / 2.46.2.1 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:H/RL:OF/RC:ND");
  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:H/RL:O/RC:X");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-1000353");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"in_the_news", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/04/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/05/04");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cloudbees:jenkins");
  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("jenkins_detect.nasl");
  script_require_keys("www/Jenkins");
  script_require_ports("Services/www", 8080);

  exit(0);
}

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

port = get_http_port(default:8080);
get_kb_item_or_exit("www/Jenkins/"+port+"/Installed");
url = build_url(qs:'/', port:port);

version = '';
fix = '';
if (get_kb_item("www/Jenkins/"+port+"/enterprise/Installed"))
{
  appname = "Jenkins Enterprise by CloudBees";
  version = get_kb_item("www/Jenkins/"+port+"/enterprise/CloudBeesVersion");

  if (version =~ "^1\.651\.")
  {
    fix = '1.651.24.1';
  }
  else if (version =~ "^1\.625\." )
  {
    fix = '1.625.24.1';
  }
  else if (version =~ "^2\.7\." )
  {
    fix = '2.7.24.0.1';
  }
  else
  {
    fix = '2.46.2.1';
  }
}
else
{
  if (get_kb_item("www/Jenkins/"+port+"/is_LTS") )
  {
    appname = "Jenkins Open Source LTS";
    fix = '2.46.2';
  }
  else
  {
    appname = "Jenkins Open Source";
    fix = '2.57';
  }

  version = get_kb_item("www/Jenkins/" + port + "/JenkinsVersion");
  if (version == 'unknown')
  {
    audit(AUDIT_UNKNOWN_WEB_APP_VER, appname, url);
  }
}

if (ver_compare(ver:version, fix:fix, strict:FALSE) < 0)
{
  report =
    '\n  URL           : ' + url +
    '\n  Product       : ' + appname +
    '\n  Version       : ' + version +
    '\n  Fixed version : ' + fix +
    '\n';

  security_report_v4(port:port, severity:SECURITY_HOLE, extra:report, xsrf:TRUE);
}
else audit(AUDIT_WEB_APP_NOT_AFFECTED, appname, url, version);
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_631C47109BE54A809310EB2847FE24DD.NASL
    descriptionJenkins Security Advisory : DescriptionSECURITY-412 through SECURITY-420 / CVE-2017-1000356 CSRF: Multiple vulnerabilities SECURITY-429 / CVE-2017-1000353 CLI: Unauthenticated remote code execution SECURITY-466 / CVE-2017-1000354 CLI: Login command allowed impersonating any Jenkins user SECURITY-503 / CVE-2017-1000355 XStream: Java crash when trying to instantiate void/Void
    last seen2020-06-01
    modified2020-06-02
    plugin id99698
    published2017-04-27
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/99698
    titleFreeBSD : jenkins -- multiple vulnerabilities (631c4710-9be5-4a80-9310-eb2847fe24dd)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(99698);
  script_version("3.5");
  script_cvs_date("Date: 2019/04/10 16:10:17");

  script_cve_id("CVE-2017-1000353", "CVE-2017-1000354", "CVE-2017-1000355", "CVE-2017-1000356");

  script_name(english:"FreeBSD : jenkins -- multiple vulnerabilities (631c4710-9be5-4a80-9310-eb2847fe24dd)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Jenkins Security Advisory : DescriptionSECURITY-412 through
SECURITY-420 / CVE-2017-1000356 CSRF: Multiple vulnerabilities
SECURITY-429 / CVE-2017-1000353 CLI: Unauthenticated remote code
execution SECURITY-466 / CVE-2017-1000354 CLI: Login command allowed
impersonating any Jenkins user SECURITY-503 / CVE-2017-1000355
XStream: Java crash when trying to instantiate void/Void"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://jenkins.io/security/advisory/2017-04-26/"
  );
  # https://vuxml.freebsd.org/freebsd/631c4710-9be5-4a80-9310-eb2847fe24dd.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?3062337c"
  );
  script_set_attribute(attribute:"solution", value:"Update 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:POC/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: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:freebsd:freebsd:jenkins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:jenkins-lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/04/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/04/27");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


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


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"jenkins<2.57")) flag++;
if (pkg_test(save_report:TRUE, pkg:"jenkins-lts<2.46.2")) flag++;

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

Seebug

bulletinFamilyexploit
descriptionMultiple Cross-Site Request Forgery vulnerabilities in Jenkins allowed malicious users to perform several administrative actions by tricking a victim into opening a web page. The most notable ones: * SECURITY-412: Restart Jenkins immediately, after all builds are finished, or after all plugin installations and builds are finished * SECURITY-412: Schedule a downgrade of Jenkins to a previously installed version if Jenkins previously upgraded itself * SECURITY-413: Install and (optionally) dynamically load any plugin present on a configured update site * SECURITY-414: Remove any update site from the Jenkins configuration * SECURITY-415: Change a user’s API token * SECURITY-416: Submit system configuration * SECURITY-417: Submit global security configuration * SECURITY-418, SECURITY-420: For Jenkins user database authentication realm: create an account if signup is enabled; or create an account if the victim is an administrator, possibly deleting the existing default _admin_ user in the process * SECURITY-419: Create a new agent, possibly executing arbitrary shell commands on the master node by choosing the appropriate launch method * SECURITY-420: Cancel a scheduled restart * SECURITY-420: Configure the global logging levels * SECURITY-420: Create a copy of an existing agent * SECURITY-420: Create copies of views in users' "My Views" or as children of the experimental "Tree View" feature * SECURITY-420: Enter "quiet down" mode in which no new builds are started * SECURITY-420: On Windows, after successful installation as a service, restart * SECURITY-420: On Windows, try to install Jenkins as a service * SECURITY-420: Set the descriptions of items (jobs), builds, and users * SECURITY-420: Submit global tools configuration (Jenkins 2.0 and up) * SECURITY-420: Toggle keeping a build forever (i.e. exclude or include it in log rotation) * SECURITY-420: Try to connect all disconnected agents simultaneously * SECURITY-420: Update the node monitor data on all agents The above, as well as several other more minor issues, have all been fixed and these actions now require POST requests, and, if configured, a CSRF crumb, to work.
idSSV:93063
last seen2017-11-19
modified2017-04-28
published2017-04-28
reporterRoot
titleJenkins Multiple CSRF vulnerabilities (CVE-2017-1000356)

References