Are there any security risks in two-way trusts?

Question

Hello!
Can anybody enumerate security risks two-way trusts have? Security holes?
I mean two-way trusts between two domains from different forests Windows 2003\2008.
Thank you for any info.

Answer 1

Hi,
There are two potential threats to interforest trust relationships in Windows Server 2003 :
1: Attack on trusting forest by malicious user in a trusted forest :
A malicious user with administrative credentials who is located in a trusted forest could monitor network authentication requests from the trusting forest to obtain the security ID (SID) information of a user who has full access to resources in the trusting
forest, such as a Domain or Enterprise Administrator. SID filtering is set on all trusts by default to help prevent malicious users from succeeding with this form of attack
2: Attack on shared resources in a trusting forest by malicious users in another organization’s forest :
Creating an external or forest trust between two forests essentially provides a pathway for authentications to travel from the trusted forest to the trusting forest. While this action by itself does not necessarily create a threat to either forest, because
it allows all secured communications to occur over the pathway, it creates a larger surface of attack for any malicious user located in a trusted forest. Selective authentication can be set on interforest trusts to help minimize this attack surface area.
For more info , Please refer :
http://technet.microsoft.com/en-us/library/cc755321(v=ws.10).aspx
Though the forest mentioned is on win 2003, this article applies to Win 2008,2008R2 forest environment as well.
Please revert in case of any queries
pankaj(MCT)