Microsoft IIS 3.0/4.0 Data Access Components access control

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in Microsoft IIS 3.0/4.0 and classified as critical. This affects an unknown part of the component Data Access Components. This manipulation causes access control. This vulnerability is handled as CVE-1999-1011. Additionally, an exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Microsoft IIS 3.0/4.0 (Web Server). It has been declared as very critical. Affected by this vulnerability is an unknown part of the component Data Access Components. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC) in IIS 3.x and 4.x exposes unsafe methods, which allows remote attackers to execute arbitrary commands.

The issue has been introduced in 05/15/1997. The weakness was released 07/19/1999 with Microsoft as MS99-025 as confirmed bulletin (Technet). It is possible to read the advisory at microsoft.com. This vulnerability is known as CVE-1999-1011. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. The pricing for an exploit might be around USD at the moment (estimation calculated on 10/21/2025). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

A public exploit has been developed in Perl and been published immediately after the advisory. It is possible to download the exploit at securityfocus.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 795 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 10357 (Microsoft IIS MDAC RDS (msadcs.dll) Arbitrary Remote Command Execution), 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 86260 (Microsoft NT IIS MDAC RDS Vulnerability (MS98-004 and MS99-025)).

Upgrading to version 5.0 eliminates this vulnerability. Applying the patch MS99-025 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. The best possible mitigation is suggested to be patching the affected component. Attack attempts may be identified with Snort ID 1023. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 1064.

The vulnerability is also documented in the databases at X-Force (1212), Exploit-DB (19425), Tenable (10357), SecurityFocus (BID 529†) and OSVDB (272†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 10357
Nessus Name: Microsoft IIS MDAC RDS (msadcs.dll) Arbitrary Remote Command Execution
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 10357
OpenVAS Name: RDS / MDAC Vulnerability (msadcs.dll) located
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: msadc.rb
MetaSploit Name: MS99-025 Microsoft IIS MDAC msadcs.dll RDS Arbitrary Remote Command Execution
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: IIS 5.0
Patch: MS99-025

Snort ID: 1023
Snort Message: SERVER-IIS msadcs.dll access
Snort Class: 🔍

Suricata ID: 2101023
Suricata Class: 🔍
Suricata Message: 🔍

TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

SourceFire IPS: 🔍
ISS Proventia IPS: 🔍

Timelineinfo

05/15/1997 🔍
07/19/1999 +795 days 🔍
07/19/1999 +0 days 🔍
07/19/1999 +0 days 🔍
07/19/1999 +0 days 🔍
07/19/1999 +0 days 🔍
04/01/2000 +257 days 🔍
09/12/2002 +894 days 🔍
10/09/2002 +26 days 🔍
06/21/2014 +4273 days 🔍
10/21/2025 +4140 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS99-025
Organization: Microsoft
Status: Confirmed

CVE: CVE-1999-1011 (🔍)
GCVE (CVE): GCVE-0-1999-1011
GCVE (VulDB): GCVE-100-14731
X-Force: 1212
SecurityFocus: 529 - NT IIS MDAC RDS Vulnerability
OSVDB: 272 - Microsoft IIS MDAC RDS Arbitrary Remote Command Execution
Vulnerability Center: 61 - [MS99-025] Microsoft IIS MDAC RDS Component Enables Arbitrary Command Execution, High

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

Entryinfo

Created: 06/21/2014 12:11
Updated: 10/21/2025 04:12
Changes: 06/21/2014 12:11 (98), 05/04/2019 20:19 (1), 01/25/2025 18:55 (17), 10/21/2025 04:12 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!