Vulnerabilities > CVE-2012-2983 - Improper Authentication vulnerability in Gentoo Webmin
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
NONE Availability impact
NONE Summary
file/edit_html.cgi in Webmin 1.590 and earlier does not perform an authorization check before showing a file's unedited contents, which allows remote attackers to read arbitrary files via the file field.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Authentication Abuse An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
- Exploiting Trust in Client (aka Make the Client Invisible) An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
- Utilizing REST's Trust in the System Resource to Register Man in the Middle This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
- Man in the Middle Attack This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.
Metasploit
description | This module exploits a directory traversal in Webmin 1.580. The vulnerability exists in the edit_html.cgi component and allows an authenticated user with access to the File Manager Module to access arbitrary files with root privileges. The module has been tested successfully with Webmin 1.580 over Ubuntu 10.04. |
id | MSF:AUXILIARY/ADMIN/WEBMIN/EDIT_HTML_FILEACCESS |
last seen | 2020-05-21 |
modified | 2020-05-12 |
published | 2012-09-15 |
references | |
reporter | Rapid7 |
source | https://github.com/rapid7/metasploit-framework/blob/master//modules/auxiliary/admin/webmin/edit_html_fileaccess.rb |
title | Webmin edit_html.cgi file Parameter Traversal Arbitrary File Access |
Nessus
NASL family Mandriva Local Security Checks NASL id MANDRIVA_MDVSA-2014-062.NASL description Multiple vulnerabilities was discovered and corrected in webmin : Multiple XSS, CSRF, and arbitrary code execution vulnerabilities that impact Webmin versions prior to 1.620 (CVE-2012-2981, CVE-2012-2982, CVE-2012-2983, CVE-2012-4893, SA51201). The 1.680 version fixed security issues that could be exploited by un-trusted Webmin users in the PHP Configuration and Webalizer modules. The Authen::Libwrap perl module used by Webmin is also being provided. The updated packages have been upgraded to the 1.680 version which is not vulnerable to these issues. last seen 2020-06-01 modified 2020-06-02 plugin id 73066 published 2014-03-18 reporter This script is Copyright (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/73066 title Mandriva Linux Security Advisory : webmin (MDVSA-2014:062) 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-2014:062. # The text itself is copyright (C) Mandriva S.A. # include("compat.inc"); if (description) { script_id(73066); script_version("1.6"); script_cvs_date("Date: 2019/08/02 13:32:55"); script_cve_id("CVE-2012-2981", "CVE-2012-2982", "CVE-2012-2983", "CVE-2012-4893"); script_bugtraq_id(55446); script_xref(name:"MDVSA", value:"2014:062"); script_xref(name:"MGASA", value:"2013-0125"); script_name(english:"Mandriva Linux Security Advisory : webmin (MDVSA-2014:062)"); script_summary(english:"Checks rpm output for the updated packages"); script_set_attribute( attribute:"synopsis", value: "The remote Mandriva Linux host is missing one or more security updates." ); script_set_attribute( attribute:"description", value: "Multiple vulnerabilities was discovered and corrected in webmin : Multiple XSS, CSRF, and arbitrary code execution vulnerabilities that impact Webmin versions prior to 1.620 (CVE-2012-2981, CVE-2012-2982, CVE-2012-2983, CVE-2012-4893, SA51201). The 1.680 version fixed security issues that could be exploited by un-trusted Webmin users in the PHP Configuration and Webalizer modules. The Authen::Libwrap perl module used by Webmin is also being provided. The updated packages have been upgraded to the 1.680 version which is not vulnerable to these issues." ); script_set_attribute( attribute:"see_also", value:"http://advisories.mageia.org/MGASA-2014-0132.html" ); script_set_attribute( attribute:"see_also", value:"http://www.webmin.com/changes.html" ); script_set_attribute( attribute:"solution", value:"Update the affected perl-Authen-Libwrap and / or webmin packages." ); 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: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:"exploithub_sku", value:"EH-12-473"); script_set_attribute(attribute:"exploit_framework_exploithub", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'Webmin /file/show.cgi Remote Command Execution'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:perl-Authen-Libwrap"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:webmin"); script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:business_server:1"); script_set_attribute(attribute:"patch_publication_date", value:"2014/03/17"); script_set_attribute(attribute:"plugin_publication_date", value:"2014/03/18"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); 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:"MDK-MBS1", cpu:"x86_64", reference:"perl-Authen-Libwrap-0.220.0-2.mbs1")) flag++; if (rpm_check(release:"MDK-MBS1", reference:"webmin-1.680-1.mbs1")) 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 family CGI abuses NASL id WEBMIN_1_600.NASL description According to its self-reported version, the Webmin install hosted on the remote host is 1.590 or lower. It is, therefore, affected by multiple vulnerabilities. last seen 2020-06-01 modified 2020-06-02 plugin id 117602 published 2018-09-19 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/117602 title Webmin <= 1.590 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(117602); script_version("1.8"); script_cvs_date("Date: 2019/11/05"); script_cve_id( "CVE-2012-2981", "CVE-2012-2982", "CVE-2012-2983", "CVE-2012-4893" ); script_bugtraq_id(55446, 66328); script_name(english:"Webmin <= 1.590 Multiple Vulnerabilities"); script_summary(english:"Checks version of Webmin."); 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, the Webmin install hosted on the remote host is 1.590 or lower. It is, therefore, affected by multiple vulnerabilities."); script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/bid/55446"); script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/bid/66328"); script_set_attribute(attribute:"see_also", value:"http://www.webmin.com/changes.html"); script_set_attribute(attribute:"solution", value: "Upgrade to Webmin 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:F/RL:OF/RC:ND"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"); script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:X"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2012-4893"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"exploithub_sku", value:"EH-12-473"); script_set_attribute(attribute:"exploit_framework_exploithub", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'Webmin /file/show.cgi Remote Command Execution'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2012/09/11"); script_set_attribute(attribute:"patch_publication_date", value:"2012/09/11"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/09/19"); 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"); 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 = "1.600"; if (ver_compare(ver:version, fix:"1.590", 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, xsrf:TRUE); } else audit(AUDIT_WEB_APP_NOT_AFFECTED, app, install_url, version);
References
- http://americaninfosec.com/research/index.html
- http://www.americaninfosec.com/research/dossiers/AISG-12-002.pdf
- http://www.kb.cert.org/vuls/id/788478
- http://www.securitytracker.com/id?1027507
- http://www.xerox.com/download/security/security-bulletin/16287-4d6b7b0c81f7b/cert_XRX13-003_v1.0.pdf
- https://github.com/webmin/webmin/commit/4cd7bad70e23e4e19be8ccf7b9f245445b2b3b80