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Windows Explorer / Internet Explorer Long Share Name Buffer Overflow Advisory Available in Danish 

Secunia Advisory: SA11482  
Release Date: 2004-04-26
Last Update: 2005-09-01

Critical:
Highly critical
Impact: System access
Where: From local network
Solution Status: Vendor Patch

OS:Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server
Microsoft Windows 95
Microsoft Windows 98
Microsoft Windows 98 Second Edition
Microsoft Windows Millenium
Microsoft Windows NT 4.0 Server
Microsoft Windows NT 4.0 Server, Terminal Server Edition
Microsoft Windows NT 4.0 Workstation
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

Software:Microsoft Internet Explorer 5.01
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 6.x

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Description:
Rodrigo Gutierrez has discovered a vulnerability in Windows and Internet Explorer, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error, which can be triggered via Internet Explorer and Windows Explorer when connecting to a file server. This can be exploited to cause a buffer overflow by setting up a malicious share with an overly long name (about 300 bytes) containing no lower case characters.

Successful exploitation may potentially allow execution of arbitrary code on a user's system but requires that the user is either tricked into connecting to a malicious file server, visit a malicious website, or follow a specially crafted link.

According to a Microsoft knowledge base article (see "Other References" section), the vulnerability should have been fixed in SP1 for Windows XP and SP4 for Windows 2000. However, the vulnerability has been confirmed on fully patched systems running Windows XP SP1 and Windows 2000 SP4.

The vulnerability has also been reported in Windows 95, 98, Me, and NT 4.0. Systems running Windows 2003 are reportedly not affected.

NOTE: Secunia would normally rate this kind of vulnerability as "Moderately critical", since this kind of traffic should be restricted to a LAN via border routers and firewalls. However, this is not the case on many networks, which leads to the higher rating.

Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.

Solution:
The variant of the vulnerability has been fixed at some point. Ensure that systems are fully updated.

Provided and/or discovered by:
Rodrigo Gutierrez

Changelog:
2004-04-27: Added Windows NT 4.0 as affected.
2005-08-31: Updated advisory.
2005-09-01: Updated "Solution" section.

Other References:
Microsoft KB article 322857:
http://support.microsoft.com/default.aspx?scid=kb;en-us;322857



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

377 Related Secunia Security Advisories, displaying 10

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4. Microsoft VBScript/JScript Script Decoding Buffer Overflow
5. Microsoft Windows GDI Image Parsing Buffer Overflows
6. Microsoft Windows DNS Client Predictable Transaction ID Vulnerability
7. Internet Explorer FTP Command Injection Vulnerability
8. Microsoft Internet Explorer Multiple Vulnerabilities
9. Microsoft Windows OLE Automation Memory Corruption
10. Microsoft WebDAV Mini-Redirector Pathname Buffer Overflow

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