SCO MMDF SMTP anti-relay disabled by default
| sco-openserver-mmdf-spam (4343) |  Medium Risk |
Description:
The default MMDF configuration in SCO UnixWare and SCO OpenServer allows SMTP message relaying. If the SMTP anti-relay feature is not enabled, malicious users can send spam email through your mail server, increasing the amount of traffic on the server.
Platforms Affected:
- SCO, SCO OpenServer 5.0
- SCO, SCO OpenServer 5.0.4
- SCO, SCO OpenServer 5.0.5
Remedy:
Disable mail relaying as described in the SCO Technical Article "How to configure MMDF to control mail routing on a per-host basis". See References.
Consequences:
Configuration
References:
- Request for Comment document RFC 2505, Anti-Spam Recommendations for SMTP MTAs at http://www.cis.ohio-state.edu/cgi-bin/rfc/rfc2505.html.
- SCO Security Web site, Security Fixes at http://www.sco.com/security/.
- SCO Technical Articles, How to configure MMDF to control mail routing on a per-host basis. at http://www.sco.com/cgi-bin/ssl_reference?104596.
- CVE-1999-0512: A mail server is explicitly configured to allow SMTP mail relay, which allows abuse by spammers.
Reported:
Apr 20, 2000
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