Vulnerabilities > CVE-2014-4326 - OS Command Injection vulnerability in Elastic Logstash

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
elastic
CWE-78
nessus

Summary

Elasticsearch Logstash 1.0.14 through 1.4.x before 1.4.2 allows remote attackers to execute arbitrary commands via a crafted event in (1) zabbix.rb or (2) nagios_nsca.rb in outputs/.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • 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.
  • Command Delimiters
    An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
  • Exploiting Multiple Input Interpretation Layers
    An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
  • Argument Injection
    An attacker changes the behavior or state of a targeted application through injecting data or command syntax through the targets use of non-validated and non-filtered arguments of exposed services or methods.
  • OS Command Injection
    In this type of an attack, an adversary injects operating system commands into existing application functions. An application that uses untrusted input to build command strings is vulnerable. An adversary can leverage OS command injection in an application to elevate privileges, execute arbitrary commands and compromise the underlying operating system.

Nessus

  • NASL familyCGI abuses
    NASL idLOGSTASH_ESA_2014_02.NASL
    descriptionLogstash 1.4.1 and prior, when configured to use the Zabbix or Nagios outputs, allows an attacker with access to send crafted events to Logstash inputs to cause Logstash to execute OS commands.
    last seen2020-06-01
    modified2020-06-02
    plugin id119461
    published2018-12-06
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/119461
    titleLogstash ESA-2014-02
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(119461);
      script_version("1.2");
      script_cvs_date("Date: 2019/11/01");
    
      script_cve_id("CVE-2014-4326");
    
      script_name(english:"Logstash ESA-2014-02");
      script_summary(english:"Checks the version of Logstash.");
    
      script_set_attribute(attribute:"synopsis", value:
    "The remote web server hosts a Java application that is vulnerable.");
      script_set_attribute(attribute:"description", value:
    "Logstash 1.4.1 and prior, when configured to use the Zabbix or Nagios
    outputs, allows an attacker with access to send crafted events to
    Logstash inputs to cause Logstash to execute OS commands.");
      # https://www.elastic.co/community/security
      script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3f00797e");
      script_set_attribute(attribute:"solution", value:
    "Upgrade to Logstash 1.4.2 or later, or disable the Zabbix and Nagios
    outputs.");
      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:L/I:L/A:L");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
      script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-4326");
    
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2014/06/24");
      script_set_attribute(attribute:"patch_publication_date", value:"2014/06/24");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/06");
    
      script_set_attribute(attribute:"plugin_type", value:"remote");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:elasticsearch:logstash");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_family(english:"CGI abuses");
    
      script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
    
      script_dependencies("logstash_api_detect.nbin");
      script_require_keys("installed_sw/Logstash");
      script_require_ports("Services/www", 9600);
    
      exit(0);
    }
    
    include("audit.inc");
    include("http.inc");
    include("vcf.inc");
    
    app = "Logstash";
    
    get_install_count(app_name:app, exit_if_zero:TRUE);
    
    port = get_http_port(default:9600);
    
    app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);
    
    constraints = [
      { "fixed_version" : "1.4.2" }
    ];
    
    vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);
    
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_2184CCAD1A1011E5B43D002590263BF5.NASL
    descriptionElastic reports : The vulnerability impacts deployments that use the either the zabbix or the nagios_nsca outputs. In these cases, an attacker with an ability to send crafted events to any source of data for Logstash could execute operating system commands with the permissions of the Logstash process. Deployments that do not use the zabbix or the nagios_nsca outputs are not vulnerable and do not need to upgrade for this reason. We have added this vulnerability to our CVE page and are working on filling out the CVE. We would like to thank Jan Karwowski and Danila Borisiuk for reporting the issue and working with us on the resolution.
    last seen2020-06-01
    modified2020-06-02
    plugin id84380
    published2015-06-25
    reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/84380
    titleFreeBSD : logstash -- Remote command execution in Logstash zabbix and nagios_nsca outputs (2184ccad-1a10-11e5-b43d-002590263bf5)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from the FreeBSD VuXML database :
    #
    # Copyright 2003-2019 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(84380);
      script_version("2.3");
      script_cvs_date("Date: 2019/07/10 16:04:13");
    
      script_cve_id("CVE-2014-4326");
    
      script_name(english:"FreeBSD : logstash -- Remote command execution in Logstash zabbix and nagios_nsca outputs (2184ccad-1a10-11e5-b43d-002590263bf5)");
      script_summary(english:"Checks for updated package in pkg_info output");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote FreeBSD host is missing a security-related update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Elastic reports :
    
    The vulnerability impacts deployments that use the either the zabbix
    or the nagios_nsca outputs. In these cases, an attacker with an
    ability to send crafted events to any source of data for Logstash
    could execute operating system commands with the permissions of the
    Logstash process.
    
    Deployments that do not use the zabbix or the nagios_nsca outputs are
    not vulnerable and do not need to upgrade for this reason.
    
    We have added this vulnerability to our CVE page and are working on
    filling out the CVE.
    
    We would like to thank Jan Karwowski and Danila Borisiuk for reporting
    the issue and working with us on the resolution."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.elastic.co/blog/logstash-1-4-2"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.elastic.co/community/security"
      );
      # https://vuxml.freebsd.org/freebsd/2184ccad-1a10-11e5-b43d-002590263bf5.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?f568ed62"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected package.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:logstash");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2014/06/24");
      script_set_attribute(attribute:"patch_publication_date", value:"2015/06/24");
      script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/25");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2015-2019 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:"logstash<1.4.2")) 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");