Signature Detail
Short Name |
SMTP:RESPONSE:RLY-PBTED |
|---|---|
Severity |
Low |
Recommended |
No |
Category |
SMTP |
Keywords |
Response Relaying Is Prohibited (Exchange) |
Release Date |
2003/04/22 |
Update Number |
1213 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
SMTP: Response Relaying Is Prohibited (Exchange)
This signature detects SMTP server responses to unsuccessful e-mail relay attempts. Attackers can attempt to relay e-mail with encapsulated e-mail addresses through a server running Microsoft Exchange Server 5.5; when the attempt is unsuccessful, attackers receive a "550 relaying is prohibited" error message.
Extended 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
- Microsoft Exchange Server 5.5 SP1
- Microsoft Exchange Server 5.5 SP2
References
- BugTraq: 567
- CVE: CVE-1999-0682