fetchmail 6.3.8-rc2 release candidate

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Greetings,

I have uploaded the second fetchmail 6.3.8 release candidate to the usual
download location: <http://home.pages.de/~mandree/fetchmail/>.

This release candidates adds strict verification of the POP3 APOP
timestamp for RFC-822 syntax to make an MD5 collision attack more
difficult - details:

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fetchmail 6.3.8 (not yet released) - CHANGES IN RC2 SINCE RC1

# SECURITY STRENGTHENING:
* Make the APOP challenge parser more distrustful and have it reject challenges
  that do not conform to RFC-822 msg-id format, in the hope to make mounting
  man-in-the-middle attacks (MITM) against APOP a bit more difficult.

  APOP is claimed insecure by Gaëtan Leurent for MITM scenarios for typical
  setups: based on MD5 collisions, it is purportedly possible to recover the
  first three characters of the shared secret (password), which would then make
  recovery of the shared secret a matter of hours or minutes; this would then
  enable the attacker to impersonate the client vis-à-vis the server.

  For further details, check
  * Gaëtan Leurent, "Message Freedom in MD4 and MD5 Collisions: Application
  to APOP", Fast Software Encryption 2007, Luxembourg. (Proceedings to appear in
  Springer's Lecture Notes on Computer Science.)
  * The mailing list discussion thread at
  <http://lists.berlios.de/pipermail/fetchmail-devel/2007-March/000887.html>
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Thank you.

Happy fetching,
Matthias Andree
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