NT Exchange Server Encapsulated SMTP Address Vulnerability

Bugtraq ID:	567
Class:	Boundary Condition Error
CVE:
Remote:	Yes
Local:	Yes
Published:	Aug 06 1999 12:00AM
Updated:	Aug 06 1999 12:00AM
Credit:	Discovered and reported to Microsoft by Laurent Frinking of Quark Deutschland GmbH.
Vulnerable:	Microsoft Exchange Server 5.5 SP2 - Microsoft BackOffice 4.5 - Microsoft BackOffice 4.5 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 - Microsoft Windows NT 4.0 Microsoft Exchange Server 5.5 SP1 - Microsoft BackOffice 4.5 - Microsoft BackOffice 4.5 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 - Microsoft Windows NT 4.0 Microsoft Exchange Server 5.5 - Microsoft BackOffice 4.5 - Microsoft BackOffice 4.5 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP6 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP5 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP4 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP3 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP2 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 SP1 - Microsoft Windows NT 4.0 - Microsoft Windows NT 4.0
Not Vulnerable:

NT Exchange Server Encapsulated SMTP Address Vulnerability

Solution:
Microsoft has released a Post-SP2 hotfix for this problem. It is available at:
ftp://ftp.microsoft.com/bussys/exchange/exchange-public/fixes/Eng/Exchg5.5/PostSP2/imc-fix

NT Exchange Server Encapsulated SMTP Address Vulnerability

References:

• Microsoft Security Bulletin MS99-027: Frequently Asked Questions (Microsoft)
  
• MS Exchange #9 (Aceweb Internet)
  
• XCON: New Registry Setting Allows the Internet Mail Service to Reject All Encaps (Microsoft)
  
• XIMS: Messages Sent to Encapsulated SMTP Address Are Rerouted Even Though Rerout (Microsoft)