Vulnerabilities > CVE-2011-1937 - Cross-Site Scripting vulnerability in Webmin

047910
CVSS 4.3 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
PARTIAL
Availability impact
NONE
network
webmin
CWE-79
nessus

Summary

Cross-site scripting (XSS) vulnerability in Webmin 1.540 and earlier allows local users to inject arbitrary web script or HTML via a chfn command that changes the real (aka Full Name) field, related to useradmin/index.cgi and useradmin/user-lib.pl.

Vulnerable Configurations

Part Description Count
Application
Webmin
107

Common Attack Pattern Enumeration and Classification (CAPEC)

  • 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.
  • Embedding Scripts in Non-Script Elements
    This attack is a form of Cross-Site Scripting (XSS) where malicious scripts are embedded in elements that are not expected to host scripts such as image tags (<img>), comments in XML documents (< !-CDATA->), etc. These tags may not be subject to the same input validation, output validation, and other content filtering and checking routines, so this can create an opportunity for an attacker to tunnel through the application's elements and launch a XSS attack through other elements. As with all remote attacks, it is important to differentiate the ability to launch an attack (such as probing an internal network for unpatched servers) and the ability of the remote attacker to collect and interpret the output of said attack.
  • Embedding Scripts within Scripts
    An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
  • Cross-Site Scripting in Error Pages
    An attacker distributes a link (or possibly some other query structure) with a request to a third party web server that is malformed and also contains a block of exploit code in order to have the exploit become live code in the resulting error page. When the third party web server receives the crafted request and notes the error it then creates an error message that echoes the malformed message, including the exploit. Doing this converts the exploit portion of the message into to valid language elements that are executed by the viewing browser. When a victim executes the query provided by the attacker the infected error message error message is returned including the exploit code which then runs in the victim's browser. XSS can result in execution of code as well as data leakage (e.g. session cookies can be sent to the attacker). This type of attack is especially dangerous since the exploit appears to come from the third party web server, who the victim may trust and hence be more vulnerable to deception.
  • Cross-Site Scripting Using Alternate Syntax
    The attacker uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.

Nessus

  • NASL familyMandriva Local Security Checks
    NASL idMANDRIVA_MDVSA-2011-109.NASL
    descriptionA vulnerability was discovered and corrected in webmin : Cross-site scripting (XSS) vulnerability in Webmin 1.540 and earlier allows local users to inject arbitrary web script or HTML via a chfn command that changes the real (aka Full Name) field, related to useradmin/index.cgi and useradmin/user-lib.pl (CVE-2011-1937). Packages for 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more: http://store.mandriva.com/product_info.php?cPath=149 products_id=490 The updated packages have been upgraded to the 1.550 version which is not vulnerable to this issue.
    last seen2020-06-01
    modified2020-06-02
    plugin id55112
    published2011-06-14
    reporterThis script is Copyright (C) 2011-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/55112
    titleMandriva Linux Security Advisory : webmin (MDVSA-2011:109)
    code
    #%NASL_MIN_LEVEL 80502
    
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Mandriva Linux Security Advisory MDVSA-2011:109. 
    # The text itself is copyright (C) Mandriva S.A.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(55112);
      script_version("1.7");
      script_cvs_date("Date: 2019/08/02 13:32:54");
    
      script_cve_id("CVE-2011-1937");
      script_bugtraq_id(47558);
      script_xref(name:"MDVSA", value:"2011:109");
    
      script_name(english:"Mandriva Linux Security Advisory : webmin (MDVSA-2011:109)");
      script_summary(english:"Checks rpm output for the updated package");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Mandriva Linux host is missing a security update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "A vulnerability was discovered and corrected in webmin :
    
    Cross-site scripting (XSS) vulnerability in Webmin 1.540 and earlier
    allows local users to inject arbitrary web script or HTML via a chfn
    command that changes the real (aka Full Name) field, related to
    useradmin/index.cgi and useradmin/user-lib.pl (CVE-2011-1937).
    
    Packages for 2009.0 are provided as of the Extended Maintenance
    Program. Please visit this link to learn more:
    http://store.mandriva.com/product_info.php?cPath=149 products_id=490
    
    The updated packages have been upgraded to the 1.550 version which is
    not vulnerable to this issue."
      );
      script_set_attribute(
        attribute:"solution", 
        value:"Update the affected webmin package."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
      script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/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:mandriva:linux:webmin");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:linux:2009.0");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:linux:2010.1");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2011/06/13");
      script_set_attribute(attribute:"plugin_publication_date", value:"2011/06/14");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2011-2019 Tenable Network Security, Inc.");
      script_family(english:"Mandriva Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/Mandrake/release", "Host/Mandrake/rpm-list");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("rpm.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/Mandrake/release")) audit(AUDIT_OS_NOT, "Mandriva / Mandake Linux");
    if (!get_kb_item("Host/Mandrake/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if (cpu !~ "^(amd64|i[3-6]86|x86_64)$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Mandriva / Mandrake Linux", cpu);
    
    
    flag = 0;
    if (rpm_check(release:"MDK2009.0", reference:"webmin-1.550-0.2mdv2009.0", yank:"mdv")) flag++;
    
    if (rpm_check(release:"MDK2010.1", reference:"webmin-1.550-0.2mdv2010.2", yank:"mdv")) flag++;
    
    
    if (flag)
    {
      if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
      else security_warning(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    
  • NASL familyCGI abuses : XSS
    NASL idWEBMIN_1_550.NASL
    descriptionAccording to its self-reported version, the Webmin install hosted on the remote host is 1.540 or lower. It is, therefore, affected by a cross site scripting vulnerability via a chfn command.
    last seen2020-06-01
    modified2020-06-02
    plugin id108554
    published2018-03-22
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/108554
    titleWebmin <= 1.540 Cross Site Scripting
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(108554);
      script_version("1.4");
      script_cvs_date("Date: 2019/11/08");
    
      script_cve_id("CVE-2011-1937");
      script_bugtraq_id(47558);
    
      script_name(english:"Webmin <= 1.540 Cross Site Scripting");
      script_summary(english:"Checks version of Webmin.");
    
      script_set_attribute(attribute:"synopsis", value:
    "The remote web server is affected by a cross site scripting
    vulnerability.");
      script_set_attribute(attribute:"description", value:
    "According to its self-reported version, the Webmin install hosted on
    the remote host is 1.540 or lower. It is, therefore, affected by 
    a cross site scripting vulnerability via a chfn command.");
      script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/bid/47558");
      script_set_attribute(attribute:"see_also", value:"http://www.webmin.com/changes.html");
      script_set_attribute(attribute:"solution", value:
    "Upgrade to Webmin 1.550 or later.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
      script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/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:"vuln_publication_date", value:"2011/04/26");
      script_set_attribute(attribute:"patch_publication_date", value:"2011/04/26");
      script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/22");
    
      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:webmin");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_family(english:"CGI abuses : XSS");
    
      script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
    
      script_dependencies("webmin.nasl");
      script_require_keys("www/webmin", "Settings/ParanoidReport");
      script_require_ports("Services/www", 10000);
    
      exit(0);
    }
    
    include("audit.inc");
    include("global_settings.inc");
    include("misc_func.inc");
    include("http.inc");
    
    app = 'Webmin';
    port = get_http_port(default:10000, embedded: TRUE);
    
    get_kb_item_or_exit('www/'+port+'/webmin');
    version = get_kb_item_or_exit('www/webmin/'+port+'/version', exit_code:1);
    source = get_kb_item_or_exit('www/webmin/'+port+'/source', exit_code:1);
    
    if (report_paranoia < 2) audit(AUDIT_PARANOID);
    
    dir = "/";
    install_url = build_url(port:port, qs:dir);
    
    fix = "1.550";
    
    if (ver_compare(ver:version, fix:"1.540", strict:FALSE) <= 0)
    {
      report =
        '\n  URL               : ' + install_url +
        '\n  Version Source    : ' + source +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix + '\n';
    
      security_report_v4(severity:SECURITY_WARNING, port:port, extra:report, xss:TRUE);
    }
    else audit(AUDIT_WEB_APP_NOT_AFFECTED, app, install_url, version);