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ChangeLog
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@ -1,3 +1,381 @@
Changes in version 0.3.5.11 - 2020-07-09
Tor 0.3.5.11 backports fixes from later tor releases, including several
usability, portability, and reliability fixes.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor features (testing, backport from 0.4.3.4-rc):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- 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 (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- 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 Testing (CI, backport from 0.4.3.4-rc):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.2.8 - 2020-07-09
Tor 0.4.2.8 backports various fixes from later releases, including
several that affect usability and portability.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor feature (sendme, flow control, backport form 0.4.3.4-rc):
- Default to sending SENDME version 1 cells. (Clients are already
sending these, because of a consensus parameter telling them to do
so: this change only affects what clients would do if the
consensus didn't contain a recommendation.) Closes ticket 33623.
o Minor features (diagnostic, backport from 0.4.3.3-alpha):
- 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 (testing, backport from 0.4.3.4-rc):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- 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 (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
on 0.4.0.3-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (controller protocol, backport from 0.4.3.2-alpha):
- When receiving "ACTIVE" or "DORMANT" signals on the control port,
report them as SIGNAL events. Previously we would log a bug
warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-rc):
- When logging a bug, do not say "Future instances of this warning
will be silenced" unless we are actually going to silence them.
Previously we would say this whenever a BUG() check failed in the
code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.4-rc):
- Flush stderr, stdout, and file logs during shutdown, if supported
by the OS. This change helps make sure that any final logs are
recorded. Fixes bug 33087; bugfix on 0.4.1.6.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- 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 Testing (CI, backport from 0.4.3.4-rc):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.3.6 - 2020-07-09
Tor 0.4.3.6 backports several bugfixes from later releases, including
some affecting usability.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
- Fix a startup crash when tor is compiled with --enable-nss and
sandbox support is enabled. Fixes bug 34130; bugfix on
0.3.5.1-alpha. Patch by Daniel Pinto.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
- Update the man page to reflect that MinUptimeHidServDirectoryV2
defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
- Prevent an assert() that would occur when cleaning the client
descriptor cache, and attempting to close circuits for a non-
decrypted descriptor (lacking client authorization). Fixes bug
33458; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
- Fix a portability error in the configure script, where we were
using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
- Stop advertising incorrect IPv6 ORPorts in relay and bridge
descriptors, when the IPv6 port was configured as "auto". Fixes
bug 32588; bugfix on 0.2.3.9-alpha.
o Documentation (backport from 0.4.4.1-alpha):
- Fix several doxygen warnings related to imbalanced groups. Closes
ticket 34255.
Changes in version 0.4.4.2-alpha - 2020-07-09
This is the second alpha release in the 0.4.4.x series. It fixes a few
bugs in the previous release, and solves a few usability,
compatibility, and portability issues.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Minor features (bootstrap reporting):
- Report more detailed reasons for bootstrap failure when the
failure happens due to a TLS error. Previously we would just call
these errors "MISC" when they happened during read, and "DONE"
when they happened during any other TLS operation. Closes
ticket 32622.
o Minor features (directory authority):
- Authorities now recommend the protocol versions that are supported
by Tor 0.3.5 and later. (Earlier versions of Tor have been
deprecated since January of this year.) This recommendation will
cause older clients and relays to give a warning on startup, or
when they download a consensus directory. Closes ticket 32696.
o Minor features (entry guards):
- Reinstate support for GUARD NEW/UP/DOWN control port events.
Closes ticket 40001.
o Minor features (linux seccomp2 sandbox, portability):
- Allow Tor to build on platforms where it doesn't know how to
report which syscall caused the linux seccomp2 sandbox to fail.
This change should make the sandbox code more portable to less
common Linux architectures. Closes ticket 34382.
- Permit the unlinkat() syscall, which some Libc implementations use
to implement unlink(). Closes ticket 33346.
o Minor bugfix (CI, Windows):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (onion service v3 client):
- Remove a BUG() warning that could occur naturally. Fixes bug
34087; bugfix on 0.3.2.1-alpha.
o Minor bugfix (SOCKS, onion service client):
- Detect v3 onion service addresses of the wrong length when
returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix
on 0.4.3.1-alpha.
o Minor bugfixes (compiler warnings):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (control port, onion service):
- Consistently use 'address' in "Invalid v3 address" response to
ONION_CLIENT_AUTH commands. Previously, we would sometimes say
'addr'. Fixes bug 40005; bugfix on 0.4.3.1-alpha.
o Minor bugfixes (logging):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion services v3):
- Avoid a non-fatal assertion failure in certain edge-cases when
opening an intro circuit as a client. Fixes bug 34084; bugfix
on 0.3.2.1-alpha.
o Deprecated features (onion service v2):
- Add a deprecation warning for version 2 onion services. Closes
ticket 40003.
o Removed features (IPv6, revert):
- Revert the change in the default value of ClientPreferIPv6OrPort:
it breaks the torsocks use case. The SOCKS resolve command has no
mechanism to ask for a specific address family (v4 or v6), and so
prioritizing IPv6 when an IPv4 address is requested on the SOCKS
interface resulted in a failure. Tor Browser explicitly sets
PreferIPv6, so this should not affect the majority of our users.
Closes ticket 33796; bugfix on 0.4.4.1-alpha.
Changes in version 0.4.4.1-alpha - 2020-06-16
This is the first alpha release in the 0.4.4.x series. It improves
our guard selection algorithms, improves the amount of code that

286
ReleaseNotes
View File

@ -3,6 +3,292 @@ 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 0.3.5.11 - 2020-07-09
Tor 0.3.5.11 backports fixes from later tor releases, including several
usability, portability, and reliability fixes.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor features (testing, backport from 0.4.3.4-rc):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- 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 (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- 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 Testing (CI, backport from 0.4.3.4-rc):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.2.8 - 2020-07-09
Tor 0.4.2.8 backports various fixes from later releases, including
several that affect usability and portability.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- Fix a bug that was preventing DoS defenses from running on bridges
with a pluggable transport. Previously, the DoS subsystem was not
given the transport name of the client connection, thus failed to
find the GeoIP cache entry for that client address. Fixes bug
33491; bugfix on 0.3.3.2-alpha.
o Minor feature (sendme, flow control, backport form 0.4.3.4-rc):
- Default to sending SENDME version 1 cells. (Clients are already
sending these, because of a consensus parameter telling them to do
so: this change only affects what clients would do if the
consensus didn't contain a recommendation.) Closes ticket 33623.
o Minor features (diagnostic, backport from 0.4.3.3-alpha):
- 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 (testing, backport from 0.4.3.4-rc):
- The unit tests now support a "TOR_SKIP_TESTCASES" environment
variable to specify a list of space-separated test cases that
should not be executed. We will use this to disable certain tests
that are failing on Appveyor because of mismatched OpenSSL
libraries. Part of ticket 33643.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- 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 (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- Avoid compiler warnings from Clang 10 related to the use of GCC-
style "/* falls through */" comments. Both Clang and GCC allow
__attribute__((fallthrough)) instead, so that's what we're using
now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
on 0.4.0.3-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (controller protocol, backport from 0.4.3.2-alpha):
- When receiving "ACTIVE" or "DORMANT" signals on the control port,
report them as SIGNAL events. Previously we would log a bug
warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- When starting Tor any time after the first time in a process,
register the thread in which it is running as the main thread.
Previously, we only did this on Windows, which could lead to bugs
like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
on 0.3.3.1-alpha.
o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- When reading PEM-encoded key data, tolerate CRLF line-endings even
if we are not running on Windows. Previously, non-Windows hosts
would reject these line-endings in certain positions, making
certain key files hard to move from one host to another. Fixes bug
33032; bugfix on 0.3.5.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.2-rc):
- When logging a bug, do not say "Future instances of this warning
will be silenced" unless we are actually going to silence them.
Previously we would say this whenever a BUG() check failed in the
code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
o Minor bugfixes (logging, backport from 0.4.3.4-rc):
- Flush stderr, stdout, and file logs during shutdown, if supported
by the OS. This change helps make sure that any final logs are
recorded. Fixes bug 33087; bugfix on 0.4.1.6.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- 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 Testing (CI, backport from 0.4.3.4-rc):
- In our Appveyor Windows CI, copy required DLLs to test and app
directories, before running tor's tests. This ensures that tor.exe
and test*.exe use the correct version of each DLL. This fix is not
required, but we hope it will avoid DLL search issues in future.
Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- On Appveyor, skip the crypto/openssl_version test, which is
failing because of a mismatched library installation. Fix
for 33643.
Changes in version 0.4.3.6 - 2020-07-09
Tor 0.4.3.6 backports several bugfixes from later releases, including
some affecting usability.
This release also fixes TROVE-2020-001, a medium-severity denial of
service vulnerability affecting all versions of Tor when compiled with
the NSS encryption library. (This is not the default configuration.)
Using this vulnerability, an attacker could cause an affected Tor
instance to crash remotely. This issue is also tracked as CVE-2020-
15572. Anybody running a version of Tor built with the NSS library
should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
or later.
o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- Fix a crash due to an out-of-bound memory access when Tor is
compiled with NSS support. Fixes bug 33119; bugfix on
0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
and CVE-2020-15572.
o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- Use the correct 64-bit printf format when compiling with MINGW on
Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- Resume use of preemptively-built circuits when UseEntryGuards is set
to 0. We accidentally disabled this feature with that config
setting, leading to slower load times. Fixes bug 34303; bugfix
on 0.3.3.2-alpha.
o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- Fix a compiler warning on platforms with 32-bit time_t values.
Fixes bug 40028; bugfix on 0.3.2.8-rc.
o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
- Fix a startup crash when tor is compiled with --enable-nss and
sandbox support is enabled. Fixes bug 34130; bugfix on
0.3.5.1-alpha. Patch by Daniel Pinto.
o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- Downgrade a noisy log message that could occur naturally when
receiving an extrainfo document that we no longer want. Fixes bug
16016; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
- Update the man page to reflect that MinUptimeHidServDirectoryV2
defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
- Prevent an assert() that would occur when cleaning the client
descriptor cache, and attempting to close circuits for a non-
decrypted descriptor (lacking client authorization). Fixes bug
33458; bugfix on 0.4.2.1-alpha.
o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
- Fix a portability error in the configure script, where we were
using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
- Stop advertising incorrect IPv6 ORPorts in relay and bridge
descriptors, when the IPv6 port was configured as "auto". Fixes
bug 32588; bugfix on 0.2.3.9-alpha.
o Documentation (backport from 0.4.4.1-alpha):
- Fix several doxygen warnings related to imbalanced groups. Closes
ticket 34255.
Changes in version 0.4.3.5 - 2020-05-15
Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This
series adds support for building without relay code enabled, and