Don't understand this match
Julian Field
MailScanner at ecs.soton.ac.uk
Thu Mar 2 08:38:17 GMT 2006
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On 1 Mar 2006, at 22:33, Richard Thomas wrote:
> Julian Field wrote:
>
>>
>> It santises the filenames before logging them or outputting them
>> in any way.
>> One way it does this is by shortening them, except for the last
>> filename extension.
>> So you won't always see the full original filename. This is to
>> stop exploits based on the reporting of filenames (imagine if you
>> made up a filename that contained MIME boundaries, newline
>> characters and a complete MIME attachment). It never ever outputs
>> raw data based on the input data without sanitising it in some form.
>>
>> This is a fundamental anti-attack method I use.
>>
> OK, I understand the reasoning behind that. The problem is then I
> guess that it obscures the reason the file was blocked in the first
> place. Not that I'm complaining :) Just wondering if there might be
> some way to reconcile the two issues.
Not that I have found.
> (For now, I may just make the reject reason more explicit).
That's my preferred solution.
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Julian Field
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