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[Launchpad Bug Tracker <1409117@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package gnupg - 1.4.16-1ubuntu2.3

---------------
gnupg (1.4.16-1ubuntu2.3) trusty-security; urgency=medium

  * Screen responses from keyservers (LP: #1409117)
    - d/p/0001-Screen-keyserver-responses.patch
    - d/p/0002-Make-screening-of-keyserver-result-work-with-multi-k.patch
    - d/p/0003-Add-kbnode_t-for-easier-backporting.patch
    - d/p/0004-gpg-Fix-regression-due-to-the-keyserver-import-filte.patch
  * Fix large key size regression from CVE-2014-5270 changes (LP: #1371766)
    - d/p/Add-build-and-runtime-support-for-larger-RSA-key.patch
    - debian/rules: build with --enable-large-secmem
  * SECURITY UPDATE: sidechannel attack on Elgamal
    - debian/patches/CVE-2014-3591.patch: use ciphertext blinding in
      cipher/elgamal.c.
    - CVE-2014-3591
  * SECURITY UPDATE: sidechannel attack via timing variations in mpi_powm
    - debian/patches/CVE-2015-0837.patch: avoid timing variations in
      include/mpi.h, mpi/mpi-pow.c, mpi/mpiutil.c.
    - CVE-2015-0837
  * SECURITY UPDATE: invalid memory read via invalid keyring
    - debian/patches/CVE-2015-1606.patch: skip all packets not allowed in
      a keyring in g10/keyring.c.
    - CVE-2015-1606
  * SECURITY UPDATE: memcpy with overlapping ranges
    - debian/patches/CVE-2015-1607.patch: use inline functions to convert
      buffer data to scalars in g10/apdu.c, g10/app-openpgp.c,
      g10/build-packet.c, g10/ccid-driver.c, g10/getkey.c, g10/keygen.c,
      g10/keyid.c, g10/misc.c, g10/parse-packet.c, g10/tdbio.c,
      g10/trustdb.c, include/host2net.h.
    - CVE-2015-1607
 -- Marc Deslauriers <marc.deslauriers@xxxxxxxxxx>   Fri, 27 Mar 2015 08:22:48 -0400

** Changed in: gnupg2 (Ubuntu Trusty)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1409117

Title:
  GPG does not verify keys received when using --recv-keys leaving
  communicaiton with key servers vulnerable to MITM

Status in GNU Privacy Guard:
  Fix Released
Status in gnupg package in Ubuntu:
  Fix Released
Status in gnupg2 package in Ubuntu:
  Fix Released
Status in gnupg source package in Lucid:
  Confirmed
Status in gnupg2 source package in Lucid:
  Confirmed
Status in gnupg source package in Precise:
  Fix Released
Status in gnupg2 source package in Precise:
  Fix Released
Status in gnupg source package in Trusty:
  Fix Released
Status in gnupg2 source package in Trusty:
  Fix Released
Status in gnupg source package in Utopic:
  Fix Released
Status in gnupg2 source package in Utopic:
  Fix Released
Status in gnupg source package in Vivid:
  Fix Released
Status in gnupg2 source package in Vivid:
  Fix Released
Status in gnupg package in Debian:
  Fix Released

Bug description:
  The patch from http://bugs.gnupg.org/gnupg/issue1579 is critical and
  should be backported to 12.04; right now, it is not.

  This leaves 12.04 users of GPG2 vulnerable to MITM attacks on gpg2
  --recv-keys. See https://evil32.com/ for an example (the text that is
  striked out; the gpg2 package on 12.04 is still vulnerable).

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