Hello, everyone!

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Source code for Tor 0.4.6.7 is now available; you can download the source code from the download page at https://www.torproject.org/download/tor/. Packages should be available within the next several weeks, with a new Tor Browser later this week.

Changes in version 0.4.6.7 - 2021-08-16 This version fixes several bugs from earlier versions of Tor, including one that could lead to a denial-of-service attack. Everyone running an earlier version, whether as a client, a relay, or an onion service, should upgrade to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.

o Major bugfixes (cryptography, security): - Resolve an assertion failure caused by a behavior mismatch between our batch-signature verification code and our single-signature verification code. This assertion failure could be triggered remotely, leading to a denial of service attack. We fix this issue by disabling batch verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de Valence.

o Minor feature (fallbackdir): - Regenerate fallback directories list. Close ticket 40447.

o Minor features (geoip data): - Update the geoip files to match the IPFire Location Database, as retrieved on 2021/08/12.

o Minor bugfix (crypto): - Disable the unused batch verification feature of ed25519-donna. Fixes bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.

o Minor bugfixes (onion service): - Send back the extended SOCKS error 0xF6 (Onion Service Invalid Address) for a v2 onion address. Fixes bug 40421; bugfix on 0.4.6.2-alpha.

o Minor bugfixes (relay): - Reduce the compression level for data streaming from HIGH to LOW in order to reduce CPU load on the directory relays. Fixes bug 40301; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (timekeeping): - Calculate the time of day correctly on systems where the time_t type includes leap seconds. (This is not the case on most operating systems, but on those where it occurs, our tor_timegm function did not correctly invert the system's gmtime function, which could result in assertion failures when calculating voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.