changelog for 0.3.2.6-alpha.
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Nick Mathewson
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59
ChangeLog
59
ChangeLog
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Changes in version 0.3.2.6-alpha - 2017-12-01
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This version of Tor is the latest in the 0.3.2 alpha series. It
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includes fixes for several important security issues. All Tor users
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should upgrade to this release, or to one of the other releases coming
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out today.
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o Major bugfixes (security):
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- Fix a denial of service bug where an attacker could use a
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malformed directory object to cause a Tor instance to pause while
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OpenSSL would try to read a passphrase from the terminal. (If the
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terminal was not available, tor would continue running.) Fixes bug
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24246; bugfix on every version of Tor. Also tracked as TROVE-2017-
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011 and CVE-2017-8821. Found by OSS-Fuzz as
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testcase 6360145429790720.
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- Fix a denial-of-service issue where an attacker could crash a
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directory authority using a malformed router descriptor. Fixes bug
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24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
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and CVE-2017-8820.
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- When checking for replays in the INTRODUCE1 cell data for a
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(legacy) hiddden service, correctly detect replays in the RSA-
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encrypted part of the cell. We were previously checking for
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replays on the entire cell, but those can be circumvented due to
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the malleability of Tor's legacy hybrid encryption. This fix helps
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prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
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0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
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and CVE-2017-8819.
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o Major bugfixes (security, hidden service v2):
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- Fix a use-after-free error that could crash v2 Tor hidden services
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when it failed to open circuits while expiring introductions
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points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
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also tracked as TROVE-2017-013 and CVE-2017-8823.
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o Major bugfixes (security, relay):
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- When running as a relay, make sure that we never build a path
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through ourselves, even in the case where we have somehow lost the
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version of our descriptor appearing in the consensus. Fixes part
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of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
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as TROVE-2017-012 and CVE-2017-8822.
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- When running as a relay, make sure that we never ever choose
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ourselves as a guard. Previously, this was possible. Fixes part of
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bug 21534; bugfix on 0.3.0.1-alpha. This issue is also tracked as
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TROVE-2017-012 and CVE-2017-8822.
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o Minor feature (relay statistics):
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- Change relay bandwidth reporting stats interval from 4 hours to 24
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hours in order to reduce the efficiency of guard discovery
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attacks. Fixes ticket 23856.
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o Minor features (directory authority):
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- Add an IPv6 address for the "bastet" directory authority. Closes
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ticket 24394.
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o Minor bugfixes (client):
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- By default, do not enable storage of client-side DNS values. These
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values were unused by default previously, but they should not have
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been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
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Changes in version 0.3.2.5-alpha - 2017-11-22
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Tor 0.3.2.5-alpha is the fifth alpha release in the 0.3.2.x series. It
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fixes several stability and reliability bugs, including a fix for
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o Minor features (directory authority):
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- Add an IPv6 address for the "bastet" directory authority.
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Closes ticket 24394.
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o Minor bugfixes (client):
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- By default, do not enable storage of client-side DNS values.
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These values were unused by default previously, but they should
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not have been cached at all. Fixes bug 24050; bugfix on
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0.2.6.3-alpha.
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o Major bugfixes (security, hidden service v2):
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- Fix a use-after-free error that could crash v2 Tor hidden services
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when it failed to open circuits while expiring introductions
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points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This
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issue is also tracked as TROVE-2017-013 and CVE-2017-8823.
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o Minor feature (relay statistics):
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- Change relay bandwidth reporting stats interval from 4 hours to 24 hours
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in order to reduce the efficiency of guard discovery attacks. Fixes
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ticket 23856.
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@ -1,10 +0,0 @@
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o Major bugfixes (security):
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- When checking for replays in the INTRODUCE1 cell data for a (legacy)
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hiddden service, correctly detect replays in the RSA-encrypted part of
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the cell. We were previously checking for replays on the entire cell,
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but those can be circumvented due to the malleability of Tor's legacy
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hybrid encryption. This fix helps prevent a traffic confirmation
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attack. Fixes bug 24244; bugfix on 0.2.4.1-alpha. This issue is also
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tracked as TROVE-2017-009 and CVE-2017-8819.
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@ -1,6 +0,0 @@
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o Major bugfixes (security):
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- Fix a denial-of-service issue where an attacker could crash
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a directory authority using a malformed router descriptor.
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Fixes bug 24245; bugfix on 0.2.9.4-alpha. Also tracked
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as TROVE-2017-010 and CVE-2017-8820.
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@ -1,8 +0,0 @@
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o Major bugfixes (security):
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- Fix a denial of service bug where an attacker could use a malformed
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directory object to cause a Tor instance to pause while OpenSSL would
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try to read a passphrase from the terminal. (If the terminal was not
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available, tor would continue running.) Fixes bug 24246; bugfix on
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every version of Tor. Also tracked as TROVE-2017-011 and
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CVE-2017-8821. Found by OSS-Fuzz as testcase 6360145429790720.
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@ -1,6 +0,0 @@
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o Major bugfixes (security, relay):
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- When running as a relay, make sure that we never build a path through
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ourselves, even in the case where we have somehow lost the version of
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our descriptor appearing in the consensus. Fixes part of bug 21534;
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bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
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and CVE-2017-8822.
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@ -1,5 +0,0 @@
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o Major bugfixes (security, relay):
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- When running as a relay, make sure that we never ever choose ourselves
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as a guard. Previously, this was possible. Fixes part of bug 21534;
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bugfix on 0.3.0.1-alpha. This issue is also tracked as TROVE-2017-012
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and CVE-2017-8822.
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