SharePoint Server 2007 Solution Center

Security

How to implement Forms-based authentication for Office SharePoint Server 2007 and Windows SharePoint Services 3.0 by using SQL Server
Describes how to implement Forms-based authentication for Microsoft Office SharePoint Server 2007 by using Microsoft SQL Server that is installed on the same computer.
How to configure SharePoint Server 2007 and Excel Services for Kerberos authentication
Describes how to configure a server that is running Windows Server 2003, SharePoint Server 2007, and Excel Services for Kerberos authentication.
Microsoft Windows SharePoint Services 2.0 and Office SharePoint Portal Server 2003 do not support Digest authentication or Advanced Digest authentication
Explains that Microsoft Windows SharePoint Services 2.0 and Office SharePoint Portal Server 2003 do not support Digest authentication or Advanced Digest authentication.

Description of the security update for SharePoint Server 2007: October 9, 2007
A security vulnerability exists in Microsoft Office SharePoint Server 2007 that could allow cross-site scripting. This update resolves that vulnerability.
Sites that require forms-based authentication or cookie-based authentication are not crawled in SharePoint Server 2007
Describes a problem in which sites that require forms-based authentication or cookie-based authentication are not crawled when SharePoint Server 2007 or SharePoint Server 2007 for Search are directed to crawl content.
MS07-042: Description of the security update for the 2007 Microsoft Office system servers: August 14, 2007
A security vulnerability exists in the 2007 Microsoft Office system servers that could enable arbitrary code to run when a maliciously modified file is opened. This security update resolves that vulnerability.