Title: NT Exchange Server Encapsulated SMTP Address Vulnerability
Severity: MODERATE
Description:
Microsoft Exchange Server 5.5 has a vulnerability that would allow an attacker to use any Internet-connected Exchange Server 5.5 (with at least one Internet Mail Service configured) as a mail relay by using encapsulated SMTP addresses. This vulnerability poses no threat to the data or software on the server, but could allow spam to be sent from the server without the administrator's knowledge or permission, and could lead to a Denial of Service condition if the volume of the mail relayed is sufficient.
Affected Products:
- Microsoft Exchange Server 5.5.0
- Microsoft Exchange Server 5.5.0SP1
- Microsoft Exchange Server 5.5.0SP2
References:
- Aceweb Internet: MS Exchange #9
- Microsoft: Microsoft Security Bulletin MS99-027: Frequently Asked Questions
- Microsoft: 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
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