[tor-talk] Tor is out

Roger Dingledine arma at mit.edu
Wed Mar 28 09:39:21 UTC 2012

Tor fixes a variety of stability and correctness bugs
in managed pluggable transports, as well as providing other cleanups
that get us closer to a release candidate.


(Packages coming eventually. Speaking of packages, deb.torproject.org
now offers Tor Debian packages for armel on sid, wheezy, squeeze, lucid,
natty, and oneiric; and for armhf on sid and wheezy.)

Changes in version - 2012-03-26
  o Directory authority changes:
    - Change IP address for maatuska (v3 directory authority).

  o Security fixes:
    - Provide controllers with a safer way to implement the cookie
      authentication mechanism. With the old method, if another locally
      running program could convince a controller that it was the Tor
      process, then that program could trick the contoller into telling
      it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
      authentication method uses a challenge-response approach to prevent
      this attack. Fixes bug 5185, implements proposal 193.
    - Never use a bridge or a controller-supplied node as an exit, even
      if its exit policy allows it. Found by wanoskarnet. Fixes bug
      5342. Bugfix on (for controller-purpose descriptors)
      and (for bridge-purpose descriptors).
    - Only build circuits if we have a sufficient threshold of the total
      descriptors that are marked in the consensus with the "Exit"
      flag. This mitigates an attack proposed by wanoskarnet, in which
      all of a client's bridges collude to restrict the exit nodes that
      the client knows about. Fixes bug 5343.

  o Major bugfixes (on Tor 0.2.3.x):
    - Avoid an assert when managed proxies like obfsproxy are configured,
      and we receive HUP signals or setconf attempts too rapidly. This
      situation happens most commonly when Vidalia tries to attach to
      Tor or tries to configure the Tor it's attached to. Fixes bug 5084;
      bugfix on
    - Fix a relay-side pluggable transports bug where managed proxies were
      unreachable from the Internet, because Tor asked them to bind on
      localhost. Fixes bug 4725; bugfix on
    - Stop discarding command-line arguments when TestingTorNetwork
      is set. Discovered by Kevin Bauer. Fixes bug 5373; bugfix on, where task 4552 added support for two layers of
      torrc files.
    - Resume allowing the unit tests to run in gdb. This was accidentally
      made impossible when the DisableDebuggerAttachment option was
      introduced. Fixes bug 5448; bugfix on
    - Resume building with nat-pmp support. Fixes bug 4955; bugfix on Reported by Anthony G. Basile.

  o Minor bugfixes (on 0.2.2.x and earlier):
    - Ensure we don't cannibalize circuits that are longer than three hops
      already, so we don't end up making circuits with 5 or more
      hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on which introduced cannibalization.
    - Detect and reject certain misformed escape sequences in
      configuration values. Previously, these values would cause us
      to crash if received in a torrc file or over an authenticated
      control port. Bug found by Esteban Manchado Velázquez, and
      independently by Robert Connolly from Matta Consulting who further
      noted that it allows a post-authentication heap overflow. Patch
      by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
      bugfix on
    - Fix a compile warning when using the --enable-openbsd-malloc
      configure option. Fixes bug 5340; bugfix on
    - Directory caches no longer refuse to clean out descriptors because
      of missing v2 networkstatus documents, unless they're configured
      to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on Patch by Daniel Bryg.
    - Update to the latest version of the tinytest unit testing framework.
      This includes a couple of bugfixes that can be relevant for
      running forked unit tests on Windows, and removes all reserved

  o Minor bugfixes (on 0.2.3.x):
    - On a failed pipe() call, don't leak file descriptors. Fixes bug
      4296; bugfix on
    - Spec conformance: on a v3 handshake, do not send a NETINFO cell
      until after we have received a CERTS cell. Fixes bug 4361; bugfix
      on Patch by "frosty".
    - When binding to an IPv6 address, set the IPV6_V6ONLY socket
      option, so that the IP stack doesn't decide to use it for IPv4
      too. Fixes bug 4760; bugfix on
    - Ensure that variables set in Tor's environment cannot override
      environment variables that Tor passes to a managed
      pluggable-transport proxy. Previously, Tor would pass every
      variable in its environment to managed proxies along with the new
      ones, in such a way that on many operating systems, the inherited
      environment variables would override those which Tor tried to
      explicitly set. Bugfix on for most Unixoid systems;
      bugfix on for Windows.

  o Minor features:
    - A wide variety of new unit tests by Esteban Manchado Velázquez.
    - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
    - Update to the March 6 2012 Maxmind GeoLite Country database.

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