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SubjectRe: spam mails with the same Message-ID
Adrian Bunk wrote:

>On Thu, Feb 17, 2005 at 10:26:55AM -0500, Parag Warudkar wrote:
>
>
>>On Thursday 17 February 2005 10:10 am, Paolo Ornati wrote:
>>
>>
>>>>ÄúºÃ£º
>>>> ÎÒÒÑ_­ÊÕµ_ÄúµÄÀ_ÐÅ
>>>>
>>>>
>>>and... what does this means?
>>>
>>>
>>SPAM. This looks to me like a new way of spamming though, replying to valid
>>mailing list messages. (I too received couple of these in reply to my
>>messages.)
>>
>>
>
>The most interesting fact seems to be that these spam messages have the
>same message ID as the original Mails.
>
>If you run a program that automatically discards duplicate mails and the
>spam message reaches you faster than the original email through
>linux-kernel (which seems to often happen with these mails), the
>original email will be discarded.
>
>I don't know whether these are known attacks, but the automatic
>discarding of duplicated emails offers attackers nice opportunities if
>they know a message ID (as with these emails) or can guess the
>message ID (since many MUAs have predictable message IDs, an attacker C
>could use this to suppress a message from person A to person B by
>sending an email with the message ID to person B bevor person B gets
>the email from person A).
>
>
>
>>Parag
>>
>>
>
>cu
>Adrian
>
>
>
The spamers become always cleverer :-) .

Matthias-Christian Ott
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