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fold in changelog and blurb for trove-2020-002

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Nick Mathewson
2020-03-17 15:37:34 -04:00
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ChangeLog
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Changes in version 0.4.3.3-alpha - 2020-03-??
blurb here.
Tor 0.4.3.3-alpha fixes several bugs in previous releases, including
TROVE-2020-002, a major denial-of-service vulnerability that affected
all released Tor instances since 0.2.1.5-alpha. Using this
vulnerability, an attacker could cause Tor instances to consume a huge
amount of CPU, disrupting their operations for several seconds or
minutes. This attack could be launched by anybody against a relay, or
by a directory cache against any client that had connected to it. The
attacker could launch this attack as much as they wanted, thereby
disrupting service or creating patterns that could aid in traffic
analysis. This issue was found by OSS-Fuzz, and is also tracked
as CVE-2020-10592.
We do not have reason to believe that this attack is currently being
exploited in the wild, but nonetheless we advise everyone to upgrade
as soon as packages are available.
o Major bugfixes (security, denial-of-service):
- Fix a denial-of-service bug that could be used by anyone to
consume a bunch of CPU on any Tor relay or authority, or by
directories to consume a bunch of CPU on clients or hidden
services. Because of the potential for CPU consumption to
introduce observable timing patterns, we are treating this as a
high-severity security issue. Fixes bug 33119; bugfix on
0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
as TROVE-2020-002 and CVE-2020-10592.
o Major bugfixes (circuit padding, memory leak):
- Avoid a remotely triggered memory leak in the case that a circuit
padding machine is somehow negotiated twice on the same circuit.
Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
This is also tracked as TROVE-2020-004.
This is also tracked as TROVE-2020-004 and CVE-2020-10593.
o Major bugfixes (directory authority):
- Directory authorities will now send a 503 (not enough bandwidth)
@@ -44,18 +68,18 @@ Changes in version 0.4.3.3-alpha - 2020-03-??
- Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3):
- Fix an assertion failure that could result from a corrupted
ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
bugfix on 0.3.3.1-alpha. This issue is also tracked
as TROVE-2020-003.
o Minor bugfixes (onion service v3, client):
- Remove a BUG() warning that would cause a stack trace if an onion
service descriptor was freed while we were waiting for a
rendezvous circuit to complete. Fixes bug 28992; bugfix
on 0.3.2.1-alpha.
o Minor bugfixes (onion services v3):
- Fix an assertion failure that could result from a corrupted
ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
bugfix on 0.3.3.1-alpha. This issue is also tracked
as TROVE-2020-003.
o Documentation (manpage):
- Alphabetize the Server and Directory server sections of the tor
manpage. Also split Statistics options into their own section of
changes/ticket33119
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o Major bugfixes (security, denial-of-service):
- Fix a denial-of-service bug that could be used by anyone to consume a
bunch of CPU on any Tor relay or authority, or by directories to
consume a bunch of CPU on clients or hidden services. Because
of the potential for CPU consumption to introduce observable
timing patterns, we are treating this as a high-severity security
issue. Fixes bug 33119; bugfix on 0.2.1.5-alpha. We are also tracking
this issue as TROVE-2020-002.