Vulnerabilities > CVE-2014-3883 - OS Command Injection vulnerability in Webmin Usermin

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
webmin
CWE-78
nessus

Summary

Usermin before 1.600 allows remote attackers to execute arbitrary operating-system commands via unspecified vectors related to a user action.

Vulnerable Configurations

Part Description Count
Application
Webmin
76

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 : XSS
NASL idUSERMIN_1_600_MULT.NASL
descriptionAccording to its self-reported version number, the Usermin install hosted on the remote web server is prior to 1.600. It is, therefore, affected by the following vulnerabilities : - An unspecified remote command execution vulnerability. (CVE-2014-3883) - Multiple cross-site scripting (XSS) vulnerabilities. (CVE-2014-3924).
last seen2020-06-01
modified2020-06-02
plugin id77706
published2014-09-16
reporterThis script is Copyright (C) 2014-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/77706
titleUsermin < 1.600 Multiple Vulnerabilities
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(77706);
  script_version("1.3");
  script_cvs_date("Date: 2018/08/06 14:03:14");

  script_cve_id("CVE-2014-3883", "CVE-2014-3884", "CVE-2014-3924");
  script_bugtraq_id(67649, 68131);

  script_name(english:"Usermin < 1.600 Multiple Vulnerabilities");
  script_summary(english:"Checks version of Usermin.");

  script_set_attribute(attribute:"synopsis", value:"The remote web server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Usermin install
hosted on the remote web server is prior to 1.600. It is, therefore,
affected by the following vulnerabilities :

  - An unspecified remote command execution vulnerability.
    (CVE-2014-3883)

  - Multiple cross-site scripting (XSS) vulnerabilities.
    (CVE-2014-3924).");
  script_set_attribute(attribute:"see_also", value:"http://jvn.jp/en/jp/JVN92737498/index.html");
  script_set_attribute(attribute:"see_also", value:"http://www.webmin.com/uchanges.html");
  script_set_attribute(attribute:"solution", value:"Upgrade Usermin 1.600 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_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20, 74, 79, 442, 629, 711, 712, 722, 725, 750, 751, 800, 801, 809, 811, 864, 900, 928, 931, 990);

  script_set_attribute(attribute:"vuln_publication_date", value:"2014/05/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2014/05/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/09/16");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:webmin:usermin");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:usermin:usermin");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses : XSS");

  script_copyright(english:"This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.");

  script_dependencies("usermin_detect.nbin");
  script_require_keys("www/usermin", "Settings/ParanoidReport");
  script_require_ports("Services/www", 20000);

  exit(0);
}

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

app = "Usermin";
port = get_http_port(default:20000, embedded: TRUE);

get_kb_item_or_exit('www/'+port+'/usermin');
version = get_kb_item_or_exit('www/usermin/'+port+'/version', exit_code:1);
source = get_kb_item_or_exit('www/usermin/'+port+'/source', exit_code:1);

dir = '/';
install_url = build_url(port:port, qs:dir);

if (report_paranoia < 2) audit(AUDIT_PARANOID);

fix = "1.600";

ver = split(version, sep:".", keep:FALSE);
for (i=0; i<max_index(ver); i++)
  ver[i] = int(ver[i]);

if (
  (ver[0] < 1) ||
  (ver[0] == 1 && ver[1] < 600)
)
{
  set_kb_item(name:'www/'+port+'/XSS', value:TRUE);
  if (report_verbosity > 0)
  {
    report =
      '\n  URL               : ' + install_url +
      '\n  Version Source    : ' + source +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : ' + fix + '\n';
    security_warning(port:port, extra:report);
  }
  else security_warning(port);
  exit(0);
}
audit(AUDIT_WEB_APP_NOT_AFFECTED, app, install_url, version);