Microsoft IIS up to 5.1 NTLM Authentication information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Microsoft IIS up to 5.1. This issue affects some unknown processing of the component NTLM Authentication. Performing a manipulation results in information disclosure. This vulnerability is known as CVE-2002-0419. Furthermore, an exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft IIS up to 5.1 (Web Server). This affects an unknown functionality of the component NTLM Authentication. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

Information leaks in IIS 4 through 5.1 allow remote attackers to obtain potentially sensitive information or more easily conduct brute force attacks via responses from the server in which (2) in certain configurations, the server IP address is provided as the realm for Basic authentication, which could reveal real IP addresses that were obscured by NAT, or (3) when NTLM authentication is used, the NetBIOS name of the server and its Windows NT domain are revealed in response to an Authorization request. NOTE: this entry originally contained a vector (1) in which the server reveals whether it supports Basic or NTLM authentication through 401 Access Denied error messages. CVE has REJECTED this vector; it is not a vulnerability because the information is already available through legitimate use, since authentication cannot proceed without specifying a scheme that is supported by both the client and the server.

The weakness was published 08/12/2002 by David Litchfield with Next Generation Security Software as not defined posting (Bugtraq). It is possible to read the advisory at marc.theaimsgroup.com. This vulnerability is uniquely identified as CVE-2002-0419. The exploitability is told to be easy. 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. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 11871 (Microsoft IIS Authentication Method Enumeration), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 86693 (Account Brute Force Possible Through IIS NTLM Authentication Scheme).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (8382), Exploit-DB (21313), Tenable (11871), SecurityFocus (BID 4235†) and Vulnerability Center (SBV-2252†). Similar entries are available at VDB-18498 and VDB-18497. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 11871
Nessus Name: Microsoft IIS Authentication Method Enumeration
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/04/2002 🔍
03/05/2002 +1 days 🔍
08/12/2002 +160 days 🔍
08/12/2002 +0 days 🔍
10/08/2003 +422 days 🔍
10/09/2003 +1 days 🔍
07/22/2014 +3939 days 🔍
09/17/2025 +4075 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: marc.theaimsgroup.com
Researcher: David Litchfield
Organization: Next Generation Security Software
Status: Confirmed

CVE: CVE-2002-0419 (🔍)
GCVE (CVE): GCVE-0-2002-0419
GCVE (VulDB): GCVE-100-18495
X-Force: 8382
SecurityFocus: 4235 - Microsoft IIS Authentication Method Disclosure Vulnerability
Vulnerability Center: 2252 - IIS Versions 4 - 5.1 Allows Information Disclosure, Low

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

Entryinfo

Created: 07/22/2014 20:49
Updated: 09/17/2025 12:58
Changes: 07/22/2014 20:49 (64), 05/15/2019 16:12 (5), 06/09/2025 02:37 (27), 09/17/2025 12:58 (2)
Complete: 🔍
Cache ID: 216::103

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