Article ID: 188369
Article Last Modified on 10/28/2006
APPLIES TO
- Microsoft Exchange Server 5.0 Standard Edition
- Microsoft Exchange Server 5.5 Standard Edition
This article was previously published under Q188369
SYMPTOMS
A malicious attacker could connect to the NNTP port of an Exchange Server 5.5 or 5.0 machine and disrupt the information store process by issuing specific sequences of AUTHINFO commands.
When this occurs, an application error similar to one of the following may occur:
In addition, the Exchange Server information store may stop unexpectedly, causing the Internet Mail Service and other Exchange Server information services to no longer function properly.
CAUSE
Improper checking of bounds conditions on certain AUTHINFO command sequences can result in a buffer overflow.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0.
A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next service pack that contains this fix. Contact Microsoft Technical Support for more information.
This fix has been posted to the following Internet location:
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5. This problem has been corrected in the latest U.S. service pack for Microsoft Exchange Server version 5.5. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):
S E R V P A C K
Additional query words: ims internet mail connector imc
Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB188369
