Thursday, September 01, 2005

Windows Firewall flaw may hide open ports

Joris Evers writes in C|Net News:

A flaw in Windows Firewall may prevent users from seeing all the open network ports on a Windows XP or Windows Server 2003 computer.

The flaw manifests itself in the way the security application handles some entries in the Windows Registry, Microsoft said in a security advisory published Wednesday. The Windows Registry is a core part of the operating system that stores PC settings.

The bug could allow a firewall port to be open without the user being informed through the standard Windows Firewall user interface, according to the Microsoft advisory. The company has released a fix that can be downloaded from Microsoft's Web site and will be part of a future Windows service pack, the company said.

Microsoft said the firewall issue is not a security vulnerability, but said the flaw could be used by an attacker who already compromised a system in an attempt to hide exceptions in the firewall.


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