SMTP servers may perform third-party relaying on UUCP style addresses
| smtp-relay-uucp (3470) |  Medium Risk |
Description:
Some SMTP (Simple Mail Transfer Protocol) servers will allow third-party remailing ("relaying") when the attacker uses UUCP (Unix to Unix Copy) style addresses. UUCP addresses are those that use the '%' character as a delimiter, as in wily%intruder.ex@target.mv. This could allow an attacker to bounce email through your servers and obfuscate its true origin.
Platforms Affected:
- Apple, Mac OS X
- Compaq, Tru64
- Data General, DG/UX
- HP, HP-UX
- IBM, AIX
- IBM, OS2
- Linux, Kernel
- Microsoft, Windows 2000
- Microsoft, Windows 2003 Server
- Microsoft, Windows 95
- Microsoft, Windows 98
- Microsoft, Windows 98SE
- Microsoft, Windows Me
- Microsoft, Windows NT 4.0
- Microsoft, Windows XP
- SCO, SCO Unix
- SGI, IRIX
- Sun, Solaris
- Various vendors, SMTP servers
- WindRiver, BSDOS
Remedy:
Reconfigure your mail server to disallow UUCP style addressing.
Consequences:
Bypass Security
References:
- Firewall-Wizards Mailing List, Thu, 13 May 1999 17:10:32 -0500, Re: Raptor 6.0 SMTP Relay Problem at http://seclists.org/firewall-wizards/1999/May/0085.html.
- CVE-1999-0512: A mail server is explicitly configured to allow SMTP mail relay, which allows abuse by spammers.
Reported:
Not available
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