SID Filtering is an Active Directory trust security mechanism that filters unexpected or unauthorized SIDs from tokens coming from another domain.
Simple definition
SID Filtering is an Active Directory trust security mechanism that filters unexpected or unauthorized SIDs from tokens coming from another domain. It belongs to the Active Directory vocabulary and is useful when reading architecture diagrams, product documentation, logs, or administration procedures.
What is it used for?
Its main purpose is to reduce SID spoofing and privilege-escalation risk across a trust relationship. The practical value depends on the surrounding architecture, security model, and operational requirements.
How does it work?
Filtering is applied to authorization information crossing certain trust boundaries. Behavior depends on trust type and configured options.
Key points
- Scope: An Active Directory trust security mechanism that filters unexpected or unauthorized SIDs from tokens coming from another domain.
- Operational goal: Reduce SID spoofing and privilege-escalation risk across a trust relationship.
- Implementation: Filtering is applied to authorization information crossing certain trust boundaries. Behavior depends on trust type and configured options.
Points to watch
Disabling filtering to quickly fix a migration issue can create a security risk; document every exception precisely.
In short
SID Filtering = an Active Directory trust security mechanism that filters unexpected or unauthorized SIDs from tokens coming from another domain. Use it when you need to reduce SID spoofing and privilege-escalation risk across a trust relationship.