Commit fecc1952 authored by Nick Mathewson's avatar Nick Mathewson 👜
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Copy changelog to releasenotes

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......@@ -2,6 +2,54 @@ This document summarizes new features and bugfixes in each stable
release of Tor. If you want to see more detailed descriptions of the
changes in each development snapshot, see the ChangeLog file.
Changes in version - 2021-03-16
Tor backports fixes for two important denial-of-service bugs
in earlier versions of Tor.
One of these vulnerabilities (TROVE-2021-001) would allow an attacker
who can send directory data to a Tor instance to force that Tor
instance to consume huge amounts of CPU. This is easiest to exploit
against authorities, since anybody can upload to them, but directory
caches could also exploit this vulnerability against relays or clients
when they download. The other vulnerability (TROVE-2021-002) only
affects directory authorities, and would allow an attacker to remotely
crash the authority with an assertion failure. Patches have already
been provided to the authority operators, to help ensure
network stability.
We recommend that everybody upgrade to one of the releases that fixes
these issues (,, or as they become available
to you.
This release also updates our GeoIP data source, and fixes a
compatibility issue.
o Major bugfixes (security, denial of service, backport from
- Disable the dump_desc() function that we used to dump unparseable
information to disk. It was called incorrectly in several places,
in a way that could lead to excessive CPU usage. Fixes bug 40286;
bugfix on This bug is also tracked as TROVE-2021-
001 and CVE-2021-28089.
- Fix a bug in appending detached signatures to a pending consensus
document that could be used to crash a directory authority. Fixes
bug 40316; bugfix on Tracked as TROVE-2021-002
and CVE-2021-28090.
o Minor features (geoip data, backport from
- We have switched geoip data sources. Previously we shipped IP-to-
country mappings from Maxmind's GeoLite2, but in 2019 they changed
their licensing terms, so we were unable to update them after that
point. We now ship geoip files based on the IPFire Location
Database instead. (See for more
information). This release updates our geoip files to match the
IPFire Location Database as retrieved on 2021/03/12. Closes
ticket 40224.
o Removed features (mallinfo deprecated, backport from
- Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
Closes ticket 40309.
Changes in version - 2021-02-03
Tor backports numerous bugfixes from later releases,
including one that made v3 onion services more susceptible to
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