[asterisk-dev] A new kind of SIP attack ?

Pavel Troller patrol at sinus.cz
Mon Sep 12 03:39:33 CDT 2011

  Since yesterday, I can see strange "call attempts" coming to my
switches over SIP to destinations like this:
  I tried to wget the file manually and it was successful, but it was
empty (zero size).
  I'm just informing about something which may be a new kind of hacking
attempt. I hope that Asterisk doesn't perform backtick expansion during
processing of the called number, but I'm writing it there to be sure
that a developer's eye will look at this and confirm it.
  With regards,
    Pavel Troller

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