Vulnerabilities > CVE-2017-5199 - Incorrect Permission Assignment for Critical Resource vulnerability in Solarwinds LOG and Event Manager

047910
CVSS 6.5 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
SINGLE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
low complexity
solarwinds
CWE-732
nessus

Summary

The editbanner feature in SolarWinds LEM (aka SIEM) through 6.3.1 allows remote authenticated users to execute arbitrary code by editing /usr/local/contego/scripts/mgrconfig.pl.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Accessing Functionality Not Properly Constrained by ACLs
    In applications, particularly web applications, access to functionality is mitigated by the authorization framework, whose job it is to map ACLs to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application or can run queries for data that he is otherwise not supposed to.
  • Privilege Abuse
    An adversary is able to exploit features of the target that should be reserved for privileged users or administrators but are exposed to use by lower or non-privileged accounts. Access to sensitive information and functionality must be controlled to ensure that only authorized users are able to access these resources. If access control mechanisms are absent or misconfigured, a user may be able to access resources that are intended only for higher level users. An adversary may be able to exploit this to utilize a less trusted account to gain information and perform activities reserved for more trusted accounts. This attack differs from privilege escalation and other privilege stealing attacks in that the adversary never actually escalates their privileges but instead is able to use a lesser degree of privilege to access resources that should be (but are not) reserved for higher privilege accounts. Likewise, the adversary does not exploit trust or subvert systems - all control functionality is working as configured but the configuration does not adequately protect sensitive resources at an appropriate level.
  • Directory Indexing
    An adversary crafts a request to a target that results in the target listing/indexing the content of a directory as output. One common method of triggering directory contents as output is to construct a request containing a path that terminates in a directory name rather than a file name since many applications are configured to provide a list of the directory's contents when such a request is received. An adversary can use this to explore the directory tree on a target as well as learn the names of files. This can often end up revealing test files, backup files, temporary files, hidden files, configuration files, user accounts, script contents, as well as naming conventions, all of which can be used by an attacker to mount additional attacks.
  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Exploiting Incorrectly Configured Access Control Security Levels
    An attacker exploits a weakness in the configuration of access controls and is able to bypass the intended protection that these measures guard against and thereby obtain unauthorized access to the system or network. Sensitive functionality should always be protected with access controls. However configuring all but the most trivial access control systems can be very complicated and there are many opportunities for mistakes. If an attacker can learn of incorrectly configured access security settings, they may be able to exploit this in an attack. Most commonly, attackers would take advantage of controls that provided too little protection for sensitive activities in order to perform actions that should be denied to them. In some circumstances, an attacker may be able to take advantage of overly restrictive access control policies, initiating denial of services (if an application locks because it unexpectedly failed to be granted access) or causing other legitimate actions to fail due to security. The latter class of attacks, however, is usually less severe and easier to detect than attacks based on inadequate security restrictions. This attack pattern differs from CAPEC 1, "Accessing Functionality Not Properly Constrained by ACLs" in that the latter describes attacks where sensitive functionality lacks access controls, where, in this pattern, the access control is present, but incorrectly configured.

Nessus

  • NASL familyCGI abuses
    NASL idSOLARWINDS_LEM_6_3_1_HF3.NASL
    descriptionAccording to its self-reported version number, the SolarWinds Log and Event Manager installed on the remote host is prior to version 6.3.1 Hotfix 3. It is, therefore, affected by multiple vulnerabilities : - Due to the program setting insecure permissions for management scripts, a remote attacker to execute commands with elevated, root privileges.(CVE-2017-5198) - A flaw exists in the mgrconfig.pl file that may allow an authenticated remote attacker to escape from the sandbox and execute commands with elevated privileges (CVE-2017-5199) 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 id102862
    published2017-08-31
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102862
    titleSolarWinds Log and Event Manager < 6.3.1 Hotfix 3 Jailbreak and Privilege Escalation
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(102862);
      script_version("1.5");
      script_cvs_date("Date: 2019/11/12");
    
      script_cve_id("CVE-2017-5198", "CVE-2017-5199");
      script_bugtraq_id(97090, 97094);
      script_xref(name:"IAVA", value:"2017-A-0259");
    
      script_name(english:"SolarWinds Log and Event Manager < 6.3.1 Hotfix 3 Jailbreak and Privilege Escalation");
      script_summary(english:"Checks the LEM version.");
    
      script_set_attribute(attribute:"synopsis", value:
    "The remote host is affected by multiple vulnerabilities.");
      script_set_attribute(attribute:"description", value:
    "According to its self-reported version number, the SolarWinds Log and
    Event Manager installed on the remote host is prior to version 6.3.1 Hotfix 3.
    It is, therefore, affected by multiple vulnerabilities :
    
      - Due to the program setting insecure permissions for management 
      scripts, a remote attacker to execute commands with elevated, 
      root privileges.(CVE-2017-5198)
    
      - A flaw exists in the mgrconfig.pl file that may allow 
      an authenticated remote attacker to escape from the sandbox 
      and execute commands with elevated privileges (CVE-2017-5199)
    
    Note that Nessus has not tested for these issues but has instead
    relied only on the application's self-reported version number.");
      # https://blog.0xlabs.com/2017/03/solarwinds-lem-ssh-jailbreak-and.html
      script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?020871b2");
      # https://support.solarwinds.com/Success_Center/Log_Event_Manager_(LEM)/LEM_Documentation/Previous_Versions/Log_and_Event_Manager_LEM_6-3-1_Hotfix_3_ReadMe
      script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8c403f26");
      script_set_attribute(attribute:"solution", value:
    "Upgrade to SolarWinds Log and Event Manager version 6.3.1 Hotfix 3 or later.");
      script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/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-2017-5198");
    
      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:"2017/03/24");
      script_set_attribute(attribute:"patch_publication_date", value:"2017/03/24");
      script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/31");
    
      script_set_attribute(attribute:"plugin_type", value:"remote");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:solarwinds:log_and_event_manager");
      script_set_attribute(attribute:"stig_severity", value:"I");
      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("solarwinds_lem_detect.nbin");
      script_require_keys("installed_sw/SolarWinds Log and Event Manager");
      script_require_ports("Services/www", 8080, 8443);
    
      exit(0);
    }
    
    include("audit.inc");
    include("global_settings.inc");
    include("misc_func.inc");
    include("http.inc");
    include("install_func.inc");
    
    port = get_http_port(default:8080);
    
    app  = "SolarWinds Log and Event Manager";
    install = get_single_install(app_name:app, port:port, exit_if_unknown_ver:TRUE);
    
    dir        = install['path'];
    version    = install['version'];
    version_ui = install['display_version'];
    
    install_url = build_url(port:port, qs:dir);
    
    fix = "6.3.1";
    
    if(ver_compare(ver:version, fix:fix, strict:FALSE) == 0 && report_paranoia < 2)
      audit(AUDIT_POTENTIAL_VULN, app, version_ui, port);
    
    if ( ver_compare(ver:version, fix:fix, strict:FALSE) <= 0 )
    {
      report =
      '\n  URL               : ' + install_url +
      '\n  Installed version : ' + version_ui +
      '\n  Fixed version     : ' + fix +
      '\n';
      security_report_v4(severity:SECURITY_HOLE, port:port, extra:report);
    }
    else audit(AUDIT_WEB_APP_NOT_AFFECTED, app, install_url, version_ui);
    
  • NASL familyCGI abuses
    NASL idSOLARWINDS_LEM_6_3_1_HF4.NASL
    descriptionAccording to its self-reported version number, the SolarWinds Log and Event Manager installed on the remote host is prior to version 6.3.1 Hotfix 4. It is, therefore, affected by a vulnerability in the software update process. Software updates are packaged and delivered insecurely, leading to root compromise of Solarwinds devices. 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 id103874
    published2017-10-17
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103874
    titleSolarWinds Log and Event Manager < 6.3.1 Hotfix 4 Insecure HTTP Update Download MitM Code Execution