False "hide real filename" issue

Julian Field MailScanner at ecs.soton.ac.uk
Thu Sep 8 18:21:27 IST 2005

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Craig Daters wrote:

> On Sep 8, 2005, at 7:46 AM, Craig Daters wrote:
>     Hash: SHA1
>     You guys are all right. I created a file with the same name and sent
>     that to myself, and it went through! I'll have to go to the users
>     computer and look at the actual email she sent....
> Indeed, the file name was:
> SendTitaniumSecondReport-20050908sabrawestpress.com, jackustax.com, 
> laurieustax.com.csv
> To which, all I could say was, "wow! I have to set up a rule to let 
> this crap through!?"

What had happened was you were seeing SendTitaniumSe.csv in the log. 
Before MailScanner logs any filename anywhere, or includes it in any 
report, it "sanitizes" it a bit to make it safer. One of its 
sanitisation steps is to strip the body of the filename down to 14 
characters. Otherwise if you had a bug in your syslogd where very long 
log entries were not correctly handled, MailScanner would allow long 
filenames in email messages to be used as a means of exploiting a bug in 

Not that such a bug exists in syslogd as far as I am aware, it's just an 
example of my paranoid programming. Which all contributes to the fact 
that www.secunia.com lists 0 security problems ever found in MailScanner 
4. Which makes me happy :-)

Julian Field
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