Fwd: Mailscanner child freezes

Julian Field MailScanner at ecs.soton.ac.uk
Sat Nov 22 19:01:59 GMT 2008

Please try the attached (gzipped) Message.pm file. Just drop it into 
/usr/lib/MailScanner/MailScanner/Message.pm if you are running the 
latest version, and restart MailScanner.

On 22/11/08 09:58, Glenn Steen wrote:
> 2008/11/21 Scott Silva<ssilva at sgvwater.com>:
>> on 11-21-2008 7:10 AM Glenn Steen spake the following:
>>> Guys,
>>> I know my quoting style will drive you nuts, but ... please look at this.
>>> It's a heads up for 4.72.5, keep a lookout for children busy-looping
>>> while "cleaning messages".
>>> Hopefully Jules, or one of you, will have a solution ... really quick.
>>> Cheers
>>> -- Glenn
>> Glenn,
>> If you have a sample of this available, I can run it through my sendmail box
>> and see if it is only postfix related or deeper.
> The trouble is in Message.pm, so it probably affects all. You can
> easily create a testcase yourself:
> zip any file into an archive called "archive.zip" (or whatever you
> like:-), then zip "archive.zip" into a new zip file named
> "archive.zip"... then send it through .... Keep an eye on top and
> you'll see one MS child "get stuck" in "cleaning messages" eating
> close to 100% CPU.
> This bug only affect 4.72.5 (and later, from what it seems ... from
> reading the code), so all who run 4.71 are unaffected.
> Since this is easily and readily exploitable, I hesitated "going
> public" with this... I'm looking at finding a solution (it should be
> something simple, either safeguarding when constructing the hashes, or
> "loop-detecting" when travesing the "hash list"), but as always...
> Jules genius (and superior understanding of all nuances of the code)
> would likely find a simple solution to this in no time at all:-).
> I'd appreciate if you did do a test Scott.
> Cheers


Julian Field MEng CITP CEng
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