[tor-announce] New stable Tor releases:,, and (to fix TROVE-2019-001)

Nick Mathewson nickm at torproject.org
Thu Feb 21 18:18:06 UTC 2019

Hello, everyone!

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Source code for Tor,, and is now available
from the download page on our website and from the distribution
directory at https://dist.tprorject.org .  Packages should be
available within the next several weeks, with a new Tor Browser likely
in March.

These releases fix TROVE-2019-001, a possible security bug involving
the KIST cell scheduler code in versions and later.  We
are not certain that it is possible to exploit this bug in the wild,
but out of an abundance of caution, we recommend that all affected
users upgrade.  The potential impact is a remote denial-of-service
attack against clients or relays.

Also note: is the last anticipated release in the 0.3.3.x
series; that series will become unsupported next week.  The remaining
supported stable series will 0.2.9.x (long-term support until 2020),
0.3.4.x (supported until June), and 0.3.5.x (long-term support until

Below are the changes in  For changes in other versions, see
their associated ChangeLog files.

Changes in version - 2019-02-21
  Tor backports serveral fixes from later releases, including fixes
  for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x

  It also includes a fix for a medium-severity security bug affecting Tor and later. All Tor instances running an affected release
  should upgrade to,,, or

  o Major bugfixes (cell scheduler, KIST, security):
    - Make KIST consider the outbuf length when computing what it can
      put in the outbuf. Previously, KIST acted as though the outbuf
      were empty, which could lead to the outbuf becoming too full. It
      is possible that an attacker could exploit this bug to cause a Tor
      client or relay to run out of memory and crash. Fixes bug 29168;
      bugfix on This issue is also being tracked as
      TROVE-2019-001 and CVE-2019-8955.

  o Major bugfixes (networking, backport from
    - Gracefully handle empty username/password fields in SOCKS5
      username/password auth messsage and allow SOCKS5 handshake to
      continue. Previously, we had rejected these handshakes, breaking
      certain applications. Fixes bug 29175; bugfix on

  o Minor features (compilation, backport from
    - Compile correctly when OpenSSL is built with engine support
      disabled, or with deprecated APIs disabled. Closes ticket 29026.
      Patches from "Mangix".

  o Minor features (geoip):
    - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
      Country database. Closes ticket 29478.

  o Minor features (testing, backport from
    - Treat all unexpected ERR and BUG messages as test failures. Closes
      ticket 28668.

  o Minor bugfixes (onion service v3, client, backport from
    - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
      connection waiting for a descriptor that we actually have in the
      cache. It turns out that this can actually happen, though it is
      rare. Now, tor will recover and retry the descriptor. Fixes bug
      28669; bugfix on

  o Minor bugfixes (IPv6, backport from
    - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
      IPv6 socket was bound using an address family of AF_INET instead
      of AF_INET6. Fixes bug 28995; bugfix on Patch from
      Kris Katterjohn.

  o Minor bugfixes (build, compatibility, rust, backport from
    - Update Cargo.lock file to match the version made by the latest
      version of Rust, so that "make distcheck" will pass again. Fixes
      bug 29244; bugfix on

  o Minor bugfixes (client, clock skew, backport from
    - Select guards even if the consensus has expired, as long as the
      consensus is still reasonably live. Fixes bug 24661; bugfix

  o Minor bugfixes (compilation, backport from
    - Compile correctly on OpenBSD; previously, we were missing some
      headers required in order to detect it properly. Fixes bug 28938;
      bugfix on Patch from Kris Katterjohn.

  o Minor bugfixes (documentation, backport from
    - Describe the contents of the v3 onion service client authorization
      files correctly: They hold public keys, not private keys. Fixes
      bug 28979; bugfix on Spotted by "Felixix".

  o Minor bugfixes (logging, backport from
    - Rework rep_hist_log_link_protocol_counts() to iterate through all
      link protocol versions when logging incoming/outgoing connection
      counts. Tor no longer skips version 5, and we won't have to
      remember to update this function when new link protocol version is
      developed. Fixes bug 28920; bugfix on

  o Minor bugfixes (logging, backport from
    - Log more information at "warning" level when unable to read a
      private key; log more information at "info" level when unable to
      read a public key. We had warnings here before, but they were lost
      during our NSS work. Fixes bug 29042; bugfix on

  o Minor bugfixes (misc, backport from
    - The amount of total available physical memory is now determined
      using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
      when it is defined and a 64-bit variant is not available. Fixes
      bug 28981; bugfix on Patch from Kris Katterjohn.

  o Minor bugfixes (onion services, backport from
    - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
      than one private key for a hidden service. Fixes bug 29040; bugfix
    - In hs_cache_store_as_client() log an HSDesc we failed to parse at
      "debug" level. Tor used to log it as a warning, which caused very
      long log lines to appear for some users. Fixes bug 29135; bugfix
    - Stop logging "Tried to establish rendezvous on non-OR circuit..."
      as a warning. Instead, log it as a protocol warning, because there
      is nothing that relay operators can do to fix it. Fixes bug 29029;
      bugfix on

  o Minor bugfixes (tests, directory clients, backport from
    - Mark outdated dirservers when Tor only has a reasonably live
      consensus. Fixes bug 28569; bugfix on

  o Minor bugfixes (tests, backport from
    - Detect and suppress "bug" warnings from the util/time test on
      Windows. Fixes bug 29161; bugfix on
    - Do not log an error-level message if we fail to find an IPv6
      network interface from the unit tests. Fixes bug 29160; bugfix

  o Minor bugfixes (usability, backport from
    - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
      Some users took this phrasing to mean that the mentioned guard was
      under their control or responsibility, which it is not. Fixes bug
      28895; bugfix on Tor

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