ID CVE-2009-1535
Summary The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a "/protected/" initial pathname component to bypass the password protection on the protected\ folder, aka "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1122.
References
Vulnerable Configurations
  • Microsoft IIS 5.0
    cpe:2.3:a:microsoft:iis:5.0
  • Microsoft IIS 5.1
    cpe:2.3:a:microsoft:iis:5.1
  • Microsoft Internet Information Services (IIS) 6.0
    cpe:2.3:a:microsoft:iis:6.0
CVSS
Base: 7.6 (as of 10-06-2009 - 10:42)
Impact:
Exploitability:
CWE CWE-287
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.
Access
VectorComplexityAuthentication
NETWORK HIGH NONE
Impact
ConfidentialityIntegrityAvailability
COMPLETE COMPLETE COMPLETE
exploit-db via4
description Microsoft IIS 6.0 WebDAV Remote Authentication Bypass Vulnerability. CVE-2009-1535,CVE-2009-1676. Remote exploit for windows platform
id EDB-ID:8704
last seen 2016-02-01
modified 2009-05-15
published 2009-05-15
reporter kingcope
source https://www.exploit-db.com/download/8704/
title Microsoft IIS 6.0 WebDAV - Remote Authentication Bypass Vulnerability
metasploit via4
  • description This module is based on et's HTTP Directory Scanner module, with one exception. Where authentication is required, it attempts to bypass authentication using the WebDAV IIS6 Unicode vulnerability discovered by Kingcope. The vulnerability appears to be exploitable where WebDAV is enabled on the IIS6 server, and any protected folder requires either Basic, Digest or NTLM authentication.
    id MSF:AUXILIARY/SCANNER/HTTP/DIR_WEBDAV_UNICODE_BYPASS
    last seen 2019-03-08
    modified 2017-11-08
    published 2010-02-01
    reliability Normal
    reporter Rapid7
    source https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/dir_webdav_unicode_bypass.rb
    title MS09-020 IIS6 WebDAV Unicode Auth Bypass Directory Scanner
  • description This module attempts to to bypass authentication using the WebDAV IIS6 Unicode vulnerability discovered by Kingcope. The vulnerability appears to be exploitable where WebDAV is enabled on the IIS6 server, and any protected folder requires either Basic, Digest or NTLM authentication.
    id MSF:AUXILIARY/SCANNER/HTTP/MS09_020_WEBDAV_UNICODE_BYPASS
    last seen 2018-10-27
    modified 2017-11-08
    published 2009-11-26
    reliability Normal
    reporter Rapid7
    source https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/ms09_020_webdav_unicode_bypass.rb
    title MS09-020 IIS6 WebDAV Unicode Authentication Bypass
msbulletin via4
bulletin_id MS09-020
bulletin_url
date 2009-06-09T00:00:00
impact Elevation of Privilege
knowledgebase_id 970483
knowledgebase_url
severity Important
title Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege
nessus via4
  • NASL family Web Servers
    NASL id WEBDAV_IIS6_FLAW.NASL
    description IIS 6.0 does not properly sanitize WebDAV requests. It is possible to access protected resources by inserting a Unicode / (%c0%af) in the URL. Depending on the remote server configuration, protected resources may be browsed, read and/or modified.
    last seen 2019-02-21
    modified 2018-11-15
    plugin id 38808
    published 2009-05-18
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=38808
    title Microsoft IIS WebDAV Unicode Request Directory Security Bypass
  • NASL family Windows : Microsoft Bulletins
    NASL id SMB_NT_MS09-020.NASL
    description Due to a flaw in the WebDAV extension for IIS, an anonymous, remote attacker may be able to bypass authentication by sending a specially crafted HTTP request and gain access to a protected location.
    last seen 2019-02-21
    modified 2018-11-15
    plugin id 39342
    published 2009-06-10
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=39342
    title MS09-020: Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege (970483)
oval via4
accepted 2009-07-21T07:45:59.612-04:00
class vulnerability
contributors
  • name Dragos Prisaca
    organization Gideon Technologies, Inc.
  • name Dragos Prisaca
    organization Gideon Technologies, Inc.
  • name Dragos Prisaca
    organization Gideon Technologies, Inc.
  • name Dragos Prisaca
    organization Gideon Technologies, Inc.
  • name Dragos Prisaca
    organization Gideon Technologies, Inc.
  • name Dragos Prisaca
    organization Gideon Technologies, Inc.
definition_extensions
  • comment Microsoft Windows XP (x86) SP2 is installed
    oval oval:org.mitre.oval:def:754
  • comment Microsoft IIS 5.1 is installed
    oval oval:org.mitre.oval:def:460
  • comment Microsoft Windows XP (x86) SP3 is installed
    oval oval:org.mitre.oval:def:5631
  • comment Microsoft IIS 5.1 is installed
    oval oval:org.mitre.oval:def:460
  • comment Microsoft Windows XP x64 Edition SP2 is installed
    oval oval:org.mitre.oval:def:4193
  • comment Microsoft Windows Server 2003 SP2 (x86) is installed
    oval oval:org.mitre.oval:def:1935
  • comment Microsoft Windows Server 2003 SP2 (x64) is installed
    oval oval:org.mitre.oval:def:2161
  • comment Microsoft Windows Server 2003 (ia64) SP2 is installed
    oval oval:org.mitre.oval:def:1442
  • comment Microsoft IIS 6.0 is installed
    oval oval:org.mitre.oval:def:227
description The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a "/protected/" initial pathname component to bypass the password protection on the protected\ folder, aka "IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1122.
family windows
id oval:org.mitre.oval:def:6029
status accepted
submitted 2009-05-19T14:00:00
title IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability
version 33
refmap via4
cert TA09-160A
fulldisc
  • 20090515 IIS6 + webdav and unicode rides again in 2009
  • 20090515 Re: IIS6 + webdav and unicode rides again in 2009
misc
ms MS09-020
vim 20090616 IIS WebDav Vulnerability CVE ID
Last major update 21-08-2010 - 01:32
Published 10-06-2009 - 10:30
Last modified 12-10-2018 - 17:51
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