Microsoft IIS 5.0 FTP Service Wildcard denial of service

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

Summaryinfo

A vulnerability categorized as problematic has been discovered in Microsoft IIS 5.0. The affected element is an unknown function of the component FTP Service. The manipulation as part of Wildcard results in denial of service. This vulnerability is identified as CVE-2001-0334. Additionally, an exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft IIS 5.0 (Web Server). It has been classified as problematic. Affected is an unknown functionality of the component FTP Service. The manipulation as part of a Wildcard leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

FTP service in IIS 5.0 and earlier allows remote attackers to cause a denial of service via a wildcard sequence that generates a long string when it is expanded.

The issue has been introduced in 02/17/2000. The weakness was released 06/27/2001 with Microsoft as MS01-026 as confirmed bulletin (Technet). The advisory is shared for download at microsoft.com. This vulnerability is traded as CVE-2001-0334. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed in Perl. The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 496 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 27162 (Microsoft IIS FTP Denial of Service Vulnerability (MS01-026)).

Applying the patch MS01-026 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 1743.

The vulnerability is also documented in the databases at X-Force (6535), SecurityFocus (BID 2717†) and Vulnerability Center (SBV-3826†). Entries connected to this vulnerability are available at VDB-16837, VDB-16838 and VDB-16839. Once again VulDB remains the best 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

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: MS01-026
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

SourceFire IPS: 🔍
ISS Proventia IPS: 🔍

Timelineinfo

02/17/2000 🔍
05/14/2000 +87 days 🔍
06/27/2001 +409 days 🔍
06/27/2001 +0 days 🔍
06/27/2001 +0 days 🔍
02/22/2004 +970 days 🔍
07/04/2014 +3785 days 🔍
10/07/2025 +4113 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS01-026
Organization: Microsoft
Status: Confirmed

CVE: CVE-2001-0334 (🔍)
GCVE (CVE): GCVE-0-2001-0334
GCVE (VulDB): GCVE-100-16836
X-Force: 6535 - Microsoft IIS FTP wildcard processing function denial of service
SecurityFocus: 2717 - Microsoft IIS FTP Denial of Service Vulnerability
Vulnerability Center: 3826 - [MS01-026] DoS in Microsoft IIS FTP Service due to Flaw in Pattern Matching, Medium

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

Entryinfo

Created: 07/04/2014 16:20
Updated: 10/07/2025 05:07
Changes: 07/04/2014 16:20 (77), 05/20/2019 07:39 (1), 10/07/2025 05:07 (18)
Complete: 🔍
Cache ID: 216::103

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