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Vulnerability in Microsoft Outlook Printed From: LogSat Software Category: Spam Filter ISP Forum Name: Spam Filter ISP Support Forum Description: General support for Spam Filter ISP URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5054 Printed Date: 01 February 2026 at 3:40pm Topic: Vulnerability in Microsoft Outlook Posted By: LogSat Subject: Vulnerability in Microsoft Outlook Date Posted: 15 February 2005 at 9:45pm This does neither apply nor relate to SpamFilter ISP, I am however posting it here on this forum as a first step in making this vulnerability public after several repeated, failed, attempts to have Microsoft acknowledge and fix the flaw. In simple terms, Microsoft Outlook does not validate correctly the sender in a digitally signed email. This means that anyone can forge a digitally signed email to make it appear as someone else sent it... It does not take a genius to understand how serious this flaw is, knowing that digitally singned emails are used to legally sign documents and verify/trust senders... The full story is available http://www.logsat.com/Signatures - http://www.logsat.com/Signatures . ------------- Roberto Franceschetti http://www.logsat.com" rel="nofollow - LogSat Software http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

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