Microsoft Internet Explorer 6.0 SP1 Terminal Service tsuserex.dll memory corruption

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.
6.6	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Microsoft Internet Explorer 6.0 SP1. It has been classified as critical. Affected is an unknown function in the library tsuserex.dll of the component Terminal Service. This manipulation causes memory corruption. This vulnerability is registered as CVE-2006-4219. Remote exploitation of the attack is possible. Furthermore, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Microsoft Internet Explorer 6.0 SP1 (Web Browser) and classified as critical. Affected by this vulnerability is an unknown code block in the library tsuserex.dll of the component Terminal Service. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Terminal Services COM object (tsuserex.dll) allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code by instantiating it as an ActiveX object in Internet Explorer 6.0 SP1 on Microsoft Windows 2003 EE SP1 CN.

The issue has been introduced in 09/09/2002. The weakness was published 08/18/2006 (Website). It is possible to read the advisory at xsec.org. This vulnerability is known as CVE-2006-4219 since 08/18/2006. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1439 days. During that time the estimated underground price was around $25k-$100k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 100043 (Microsoft Internet Explorer Terminal Service COM Object Denial of Service Vulnerability).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (28444), SecurityFocus (BID 19570†) and Vulnerability Center (SBV-13118†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Web Browser

Vendor

Microsoft

Name

Internet Explorer

Version

6.0 SP1

License

commercial

Support

end of life

Website

Vendor: https://www.microsoft.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
SourceFire IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

09/09/2002 🔍
08/17/2006 +1438 days 🔍
08/17/2006 +0 days 🔍
08/18/2006 +1 days 🔍
08/18/2006 +0 days 🔍
08/18/2006 +0 days 🔍
11/20/2006 +94 days 🔍
03/12/2015 +3034 days 🔍
06/18/2025 +3751 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: xsec.org
Status: Confirmed

CVE: CVE-2006-4219 (🔍)
GCVE (CVE): GCVE-0-2006-4219
GCVE (VulDB): GCVE-100-31855
X-Force: 28444
SecurityFocus: 19570 - Microsoft Internet Explorer TSUserEX.DLL ActiveX Control Memory Corruption Vulnerability
Vulnerability Center: 13118 - Microsoft Internet Explorer 6.0 Terminal Services COM Object Vulnerability, Medium

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

Entryinfo

Created: 03/12/2015 15:51
Updated: 06/18/2025 17:12
Changes: 03/12/2015 15:51 (58), 05/07/2019 12:41 (11), 06/18/2025 17:12 (19)
Complete: 🔍
Cache ID: 216::103