[tor-talk] Tor 0.2.5.6-alpha is out
arma at mit.edu
Wed Jul 30 07:48:09 UTC 2014
Tor 0.2.5.6-alpha brings us a big step closer to slowing down the
risk from guard rotation, and fixes a variety of other issues to get
us closer to a release candidate.
Changes in version 0.2.5.6-alpha - 2014-07-28
o Major features (also in 0.2.4.23):
- Make the number of entry guards configurable via a new
NumEntryGuards consensus parameter, and the number of directory
guards configurable via a new NumDirectoryGuards consensus
parameter. Implements ticket 12688.
o Major bugfixes (also in 0.2.4.23):
- Fix a bug in the bounds-checking in the 32-bit curve25519-donna
implementation that caused incorrect results on 32-bit
implementations when certain malformed inputs were used along with
a small class of private ntor keys. This bug does not currently
appear to allow an attacker to learn private keys or impersonate a
Tor server, but it could provide a means to distinguish 32-bit Tor
implementations from 64-bit Tor implementations. Fixes bug 12694;
bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
o Major bugfixes:
- Perform circuit cleanup operations even when circuit
construction operations are disabled (because the network is
disabled, or because there isn't enough directory information).
Previously, when we were not building predictive circuits, we
were not closing expired circuits either. Fixes bug 8387; bugfix on
0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
became more strict about when we have "enough directory information
to build circuits".
o Minor features:
- Authorities now assign the Guard flag to the fastest 25% of the
network (it used to be the fastest 50%). Also raise the consensus
weight that guarantees the Guard flag from 250 to 2000. For the
current network, this results in about 1100 guards, down from 2500.
This step paves the way for moving the number of entry guards
down to 1 (proposal 236) while still providing reasonable expected
performance for most users. Implements ticket 12690.
- Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
- Slightly enhance the diagnostic message for bug 12184.
o Minor bugfixes (also in 0.2.4.23):
- Warn and drop the circuit if we receive an inbound 'relay early'
cell. Those used to be normal to receive on hidden service circuits
due to bug 1038, but the buggy Tor versions are long gone from
the network so we can afford to resume watching for them. Resolves
the rest of bug 1038; bugfix on 0.2.1.19.
- Correct a confusing error message when trying to extend a circuit
via the control protocol but we don't know a descriptor or
microdescriptor for one of the specified relays. Fixes bug 12718;
bugfix on 0.2.3.1-alpha.
o Minor bugfixes:
- Fix compilation when building with bufferevents enabled. (This
configuration is still not expected to work, however.)
Fixes bugs 12438, 12474, 11578; bugfixes on 0.2.5.1-alpha and
0.2.5.3-alpha. Patches from Anthony G. Basile and Sathyanarayanan
- Compile correctly with builds and forks of OpenSSL (such as
LibreSSL) that disable compression. Fixes bug 12602; bugfix on
0.2.1.1-alpha. Patch from "dhill".
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