Microsoft IIS 5.0 improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft IIS 5.0. The affected element is an unknown function. Performing a manipulation results in improper authentication. This vulnerability is cataloged as CVE-2009-1122. Furthermore, there is an exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Microsoft IIS 5.0 (Web Server). This affects an unknown code. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 SP4 does not properly decode URLs, which allows remote attackers to bypass authentication, and possibly read or create files, via a crafted HTTP request, aka "IIS 5.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1535.

The bug was discovered 05/15/2009. The weakness was shared 06/10/2009 by Yamata Li (Website). The advisory is shared at us-cert.gov. This vulnerability is uniquely identified as CVE-2009-1122 since 03/25/2009. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available.

It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 3400 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 39342 (MS09-020: Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege (970483)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 86837 (Internet Information Services (IIS) Could Allow Elevation of Privilege (MS09-020)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published even before and not after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8221.

The vulnerability is also documented in the databases at X-Force (50768), Tenable (39342), SecurityFocus (BID 35232†), OSVDB (56474†) and SecurityTracker (ID 1022358†). The entries VDB-37163, VDB-48554, VDB-48553 and VDB-48552 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.1
VulDB Temp Score: 7.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 39342
Nessus Name: MS09-020: Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege (970483)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 900567
OpenVAS Name: Microsoft IIS Security Bypass Vulnerability (970483)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: dir_webdav_unicode_bypass.rb
MetaSploit Name: Web Site Crawler
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

02/17/2000 🔍
03/25/2009 +3324 days 🔍
05/15/2009 +51 days 🔍
05/15/2009 +0 days 🔍
06/09/2009 +25 days 🔍
06/09/2009 +0 days 🔍
06/09/2009 +0 days 🔍
06/10/2009 +1 days 🔍
06/10/2009 +0 days 🔍
06/10/2009 +0 days 🔍
06/10/2009 +0 days 🔍
03/17/2015 +2106 days 🔍
11/09/2025 +3890 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: us-cert.gov
Researcher: Yamata Li
Status: Confirmed

CVE: CVE-2009-1122 (🔍)
GCVE (CVE): GCVE-0-2009-1122
GCVE (VulDB): GCVE-100-48549

OVAL: 🔍
IAVM: 🔍

X-Force: 50768
SecurityFocus: 35232 - Microsoft IIS 5.0 WebDAV Authentication Bypass Vulnerability
OSVDB: 56474 - CVE-2009-1122 - MS09-020 - Microsoft IIS - Authentication Bypass Issue
SecurityTracker: 1022358
Vulnerability Center: 22479 - [MS09-020] Microsoft IIS 5.0 on Windows 2000 WebDAV Remote Bypass Restrictions via HTTP Request, High
Vupen: ADV-2009-1539

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 03/17/2015 23:38
Updated: 11/09/2025 20:14
Changes: 03/17/2015 23:38 (86), 09/05/2019 19:02 (11), 08/11/2021 15:46 (3), 11/09/2025 20:14 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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