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
Short Name
SMTP:RESPONSE:RLY-PBTED
Severity
Warning
Recommended
False
Recommended Action
None
Category
SMTP
Keywords
(Exchange) CVE-1999-0682 Is Prohibited Relaying Response bid:567
Release Date
04/22/2003
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3375
False Positive
Unknown
Vendors
Microsoft
CVSS Score
5.0