Full Disclosure mailing list archives
Novell/Ximian Evolution multiple text attachments DoS
From: Kristian Hermansen <khermansen () ht-technology com>
Date: Fri, 25 Feb 2005 19:45:32 -0500
================== =====Analysis===== ================== I just wanted to inform users of Ximian Evolution 2.0 software that there exists a way to temporarily DoS the local application and/or machine by attaching an absurd amount of .ezm files to a normal email. It seems that Evolution tries to interpret all these attachments and will actually display them if it determines they are text. The problem comes when Evolution is sent an email with say, greater than 1000 .ezm attachments, and the application tries to unroll them all before allowing you to do anything else within the application. These .ezm files are usually created by the EZ Mailing List Manager software, but one may custom design their own to execute the DoS attack. There seem to be other attachment types that can be used as well, as long as Evolution tries to unroll them for view in the message window. ================== ===Implications=== ================== The attack is not sophisticated and Evolution will eventually interpret all of the attachments -- but until that time (very long), it would appear to the user that the application has crashed and is unresponsive. A future attack method that exploits flaws in the attachment renderer could be combined with this DoS attack to confuse the user while running some malicious script in the background. ================== =====Affected===== ================== Tested on Evolution <=2.0.2 Note: higher versions may still be affected ================== =====Solution===== ================== Unknown for now. Will check out CVS, and if time, issue patch. -- Kristian Hermansen <khermansen () ht-technology com>
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Current thread:
- Novell/Ximian Evolution multiple text attachments DoS Kristian Hermansen (Feb 25)
- RE: [lists] Novell/Ximian Evolution multiple text attachmentsDoS Curt Purdy (Feb 26)
- RE: [lists] Novell/Ximian Evolution multiple text attachmentsDoS Roman Drahtmueller (Feb 26)
- RE: [lists] Novell/Ximian Evolution multiple textattachmentsDoS Curt Purdy (Feb 26)
- RE: [lists] Novell/Ximian Evolution multiple text attachmentsDoS Roman Drahtmueller (Feb 26)
- RE: [lists] Novell/Ximian Evolution multiple text attachmentsDoS Curt Purdy (Feb 26)