Zero-length attachments

Kevin Spicer kevins at BMRB.CO.UK
Wed Oct 1 19:59:16 IST 2003

On Wed, 2003-10-01 at 19:42, Antony Stone wrote:

>If the option is set at "Yes" then Zero-size attachments bypass the
>filetype and virus checks (the latter two for efficiency, because
>nothing to bother checking).

no they should still be blocked, because...

a) its gives the impression of inconsistency
b) zero byte files could be used in nuisance social enginering attacks
("please copy the attached updated file - vimportant.dll into
C:\windows\system32, love from Microsoft")
c) Files appearing to get through the filter could send some managers
into a flurry of panic thinking something has gone wrong, causing them
not to trust MailScanner.
d) Odds are there is something suspect about any mail with a zero byte

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