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340
ChangeLog
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@ -1,3 +1,343 @@
Changes in version 0.4.3.3-alpha - 2020-03-18
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 and CVE-2020-10593.
o Major bugfixes (directory authority):
- Directory authorities will now send a 503 (not enough bandwidth)
code to clients when under bandwidth pressure. Known relays and
other authorities will always be answered regardless of the
bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
o Minor features (diagnostic):
- Improve assertions and add some memory-poisoning code to try to
track down possible causes of a rare crash (32564) in the EWMA
code. Closes ticket 33290.
o Minor features (directory authorities):
- Directory authorities now reject descriptors from relays running
Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
o Minor features (usability):
- Include more information when failing to parse a configuration
value. This should make it easier to tell what's going wrong when
a configuration file doesn't parse. Closes ticket 33460.
o Minor bugfix (relay, configuration):
- Warn if the ContactInfo field is not set, and tell the relay
operator that not having a ContactInfo field set might cause their
relay to get rejected in the future. Fixes bug 33361; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (coding best practices checks):
- Allow the "practracker" script to read unicode files when using
Python 2. We made the script use unicode literals in 0.4.3.1-alpha,
but didn't change the codec for opening files. Fixes bug 33374;
bugfix on 0.4.3.1-alpha.
o Minor bugfixes (continuous integration):
- Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
on 0.3.2.2-alpha.
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
the manpage. Closes ticket 33188. Work by Swati Thacker as part of
Google Season of Docs.
- Document the __OwningControllerProcess torrc option and specify
its polling interval. Resolves issue 32971.
o Testing (Travis CI):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.2.7 - 2020-03-18
This is the third stable release in the 0.4.2.x series. It backports
numerous fixes from later releases, including a fix for 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, backport from 0.4.3.3-alpha):
- 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, backport from 0.4.3.3-alpha):
- 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 and CVE-2020-10593.
o Major bugfixes (directory authority, backport from 0.4.3.3-alpha):
- Directory authorities will now send a 503 (not enough bandwidth)
code to clients when under bandwidth pressure. Known relays and
other authorities will always be answered regardless of the
bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- 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 (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.1.9 - 2020-03-18
Tor 0.4.1.9 backports important fixes from later Tor releases,
including a fix for 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, backport from 0.4.3.3-alpha):
- 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, backport from 0.4.3.3-alpha):
- 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 and CVE-2020-10593.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- 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 (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.3.5.10 - 2020-03-18
Tor 0.3.5.10 backports many fixes from later Tor releases, including a
fix for 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, backport from 0.4.3.3-alpha):
- 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 (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- Correct how we use libseccomp. Particularly, stop assuming that
rules are applied in a particular order or that more rules are
processed after the first match. Neither is the case! In
libseccomp <2.4.0 this lead to some rules having no effect.
libseccomp 2.4.0 changed how rules are generated, leading to a
different ordering, which in turn led to a fatal crash during
startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
Peter Gerber.
o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (crash, backport from 0.4.2.4-rc):
- When running Tor with an option like --verify-config or
--dump-config that does not start the event loop, avoid crashing
if we try to exit early because of an error. Fixes bug 32407;
bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- 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 (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (backport from 0.4.3.1-alpha):
- Re-enable the Travis CI macOS Chutney build, but don't let it
prevent the Travis job from finishing. (The Travis macOS jobs are
slow, so we don't want to have it delay the whole CI process.)
Closes ticket 32629.
- Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
fix the sandbox errors in 32722. Closes ticket 32240.
o Testing (continuous integration, backport from 0.4.3.1-alpha):
- Use zstd in our Travis Linux builds. Closes ticket 32242.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.3.2-alpha - 2020-02-10
This is the second stable alpha release in the Tor 0.4.3.x series. It
fixes several bugs present in the previous alpha release. Anybody

340
ReleaseNotes
View File

@ -2,6 +2,346 @@ 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 0.4.3.3-alpha - 2020-03-18
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 and CVE-2020-10593.
o Major bugfixes (directory authority):
- Directory authorities will now send a 503 (not enough bandwidth)
code to clients when under bandwidth pressure. Known relays and
other authorities will always be answered regardless of the
bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
o Minor features (diagnostic):
- Improve assertions and add some memory-poisoning code to try to
track down possible causes of a rare crash (32564) in the EWMA
code. Closes ticket 33290.
o Minor features (directory authorities):
- Directory authorities now reject descriptors from relays running
Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
o Minor features (usability):
- Include more information when failing to parse a configuration
value. This should make it easier to tell what's going wrong when
a configuration file doesn't parse. Closes ticket 33460.
o Minor bugfix (relay, configuration):
- Warn if the ContactInfo field is not set, and tell the relay
operator that not having a ContactInfo field set might cause their
relay to get rejected in the future. Fixes bug 33361; bugfix
on 0.1.1.10-alpha.
o Minor bugfixes (coding best practices checks):
- Allow the "practracker" script to read unicode files when using
Python 2. We made the script use unicode literals in 0.4.3.1-alpha,
but didn't change the codec for opening files. Fixes bug 33374;
bugfix on 0.4.3.1-alpha.
o Minor bugfixes (continuous integration):
- Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
on 0.3.2.2-alpha.
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
the manpage. Closes ticket 33188. Work by Swati Thacker as part of
Google Season of Docs.
- Document the __OwningControllerProcess torrc option and specify
its polling interval. Resolves issue 32971.
o Testing (Travis CI):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.2.7 - 2020-03-18
This is the third stable release in the 0.4.2.x series. It backports
numerous fixes from later releases, including a fix for 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, backport from 0.4.3.3-alpha):
- 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, backport from 0.4.3.3-alpha):
- 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 and CVE-2020-10593.
o Major bugfixes (directory authority, backport from 0.4.3.3-alpha):
- Directory authorities will now send a 503 (not enough bandwidth)
code to clients when under bandwidth pressure. Known relays and
other authorities will always be answered regardless of the
bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- 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 (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.1.9 - 2020-03-18
Tor 0.4.1.9 backports important fixes from later Tor releases,
including a fix for 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, backport from 0.4.3.3-alpha):
- 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, backport from 0.4.3.3-alpha):
- 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 and CVE-2020-10593.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- 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 (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
allow_failure), to speed up the build. Closes ticket 33195.
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.3.5.10 - 2020-03-18
Tor 0.3.5.10 backports many fixes from later Tor releases, including a
fix for 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, backport from 0.4.3.3-alpha):
- 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 (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- Correct how we use libseccomp. Particularly, stop assuming that
rules are applied in a particular order or that more rules are
processed after the first match. Neither is the case! In
libseccomp <2.4.0 this lead to some rules having no effect.
libseccomp 2.4.0 changed how rules are generated, leading to a
different ordering, which in turn led to a fatal crash during
startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
Peter Gerber.
o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- Stop allowing failures on the Travis CI stem tests job. It looks
like all the stem hangs we were seeing before are now fixed.
Closes ticket 33075.
o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- Lowercase the configured value of BridgeDistribution before adding
it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
o Minor bugfixes (crash, backport from 0.4.2.4-rc):
- When running Tor with an option like --verify-config or
--dump-config that does not start the event loop, avoid crashing
if we try to exit early because of an error. Fixes bug 32407;
bugfix on 0.3.3.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- If we encounter a bug when flushing a buffer to a TLS connection,
only log the bug once per invocation of the Tor process.
Previously we would log with every occurrence, which could cause
us to run out of disk space. Fixes bug 33093; bugfix
on 0.3.2.2-alpha.
o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- 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 (rust, build, backport from 0.4.3.2-alpha):
- Fix a syntax warning given by newer versions of Rust that was
creating problems for our continuous integration. Fixes bug 33212;
bugfix on 0.3.5.1-alpha.
o Testing (backport from 0.4.3.1-alpha):
- Re-enable the Travis CI macOS Chutney build, but don't let it
prevent the Travis job from finishing. (The Travis macOS jobs are
slow, so we don't want to have it delay the whole CI process.)
Closes ticket 32629.
- Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
fix the sandbox errors in 32722. Closes ticket 32240.
o Testing (continuous integration, backport from 0.4.3.1-alpha):
- Use zstd in our Travis Linux builds. Closes ticket 32242.
o Testing (Travis CI, backport from 0.4.3.3-alpha):
- Remove a redundant distcheck job. Closes ticket 33194.
- Sort the Travis jobs in order of speed: putting the slowest jobs
first takes full advantage of Travis job concurrency. Closes
ticket 33194.
- Stop allowing the Chutney IPv6 Travis job to fail. This job was
previously configured to fast_finish (which requires
- When a Travis chutney job fails, use chutney's new "diagnostics.sh"
tool to produce detailed diagnostic output. Closes ticket 32792.
Changes in version 0.4.2.6 - 2020-01-30
This is the second stable release in the 0.4.2.x series. It backports
several bugfixes from 0.4.3.1-alpha, including some that had affected