Microsoft IIS 4.0/5.0 ISAPI Extension Source information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Microsoft IIS 4.0/5.0. Impacted is an unknown function of the component ISAPI Extension Handler. Such manipulation leads to information disclosure (Source). This vulnerability is documented as CVE-2000-0246. Additionally, an exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Microsoft IIS 4.0/5.0 (Web Server). It has been rated as problematic. Affected by this issue is some unknown functionality of the component ISAPI Extension Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (Source). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

IIS 4.0 and 5.0 does not properly perform ISAPI extension processing if a virtual directory is mapped to a UNC share, which allows remote attackers to read the source code of ASP and other files, aka the "Virtualized UNC Share" vulnerability.

The weakness was released 03/30/2000 with Microsoft as MS00-019 as confirmed bulletin (Technet). The advisory is shared for download at microsoft.com. This vulnerability is handled as CVE-2000-0246. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 11443 (MS00-019: Microsoft IIS ISAPI Virtual Directory UNC Mapping ASP Source Disclosure (uncredentialed check)), 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 86222 (Microsoft IIS UNC Mapped Virtual Host Vulnerability (MS00-019)).

Applying the patch MS00-019 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8519.

The vulnerability is also documented in the databases at X-Force (4204), Exploit-DB (19824), Tenable (11443), SecurityFocus (BID 1081†) and Vulnerability Center (SBV-779†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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

Name: Source
Class: Information disclosure / Source
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: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 11443
Nessus Name: MS00-019: Microsoft IIS ISAPI Virtual Directory UNC Mapping ASP Source Disclosure (uncredentialed check)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 11443
OpenVAS Name: Microsoft IIS UNC Mapped Virtual Host Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: MS00-019
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍

Timelineinfo

03/30/2000 🔍
03/30/2000 +0 days 🔍
03/30/2000 +0 days 🔍
03/30/2000 +0 days 🔍
02/02/2003 +1039 days 🔍
03/23/2003 +49 days 🔍
06/23/2014 +4110 days 🔍
10/18/2025 +4135 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS00-019
Researcher: Discovered by Adam Coyne , publicized in Microsoft Security Bulletin (MS00-019) on March 30, 2000.
Organization: Microsoft
Status: Confirmed

CVE: CVE-2000-0246 (🔍)
GCVE (CVE): GCVE-0-2000-0246
GCVE (VulDB): GCVE-100-15416
X-Force: 4204
SecurityFocus: 1081 - Microsoft IIS UNC Mapped Virtual Host Vulnerability
Vulnerability Center: 779 - [MS00-019] Microsoft IIS UNC Mapped Virtual Host Vulnerability, Medium

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

Entryinfo

Created: 06/24/2014 01:00
Updated: 10/18/2025 02:20
Changes: 06/24/2014 01:00 (80), 10/08/2020 16:32 (1), 12/30/2024 04:21 (25), 10/18/2025 02:20 (2)
Complete: 🔍
Cache ID: 216:431:103

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