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Snowflake moving to stable in Tor Browser 10.5

We're excited to announce that Snowflake will be shipped as one of the default bridge options with stable versions of Tor Browser later this month. Snowflake is a pluggable transport that uses a combination of domain fronting and peer-to-peer WebRTC connections between clients and volunteers to circumvent Internet censorship.

Internet Freedom, Privacy, & LGBTQIA+ Human Rights

Every June, we recognize Pride month because internet freedom and the human rights of LGBTQIA+ people go hand in hand. Many LGBTQIA+ people need privacy and censorship circumvention tools like Tor to communicate with their peers, find important resources, or fight for their rights without facing violence.

New stable security releases: 0.3.5.15, 0.4.4.9, 0.4.5.9, 0.4.6.5

by nickm | June 14, 2021

After months of work, we have a new stable release series! If you build Tor from source, you can download the source code for 0.4.6.5 on the download page. Packages should be available within the next several weeks, with a new Tor Browser around the end of the week.

Because this release includes security fixes, we are also releasing updates for our other supported releases. You can find their source at https://dist.torproject.org:

Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x series includes numerous features and bugfixes, including a significant improvement to our circuit timeout algorithm that should improve observed client performance, and a way for relays to report when they are overloaded.

This release also includes security fixes for several security issues, including a denial-of-service attack against onion service clients, and another denial-of-service attack against relays. Everybody should upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.

Below are the changes since 0.4.5.8. For a list of changes since 0.4.6.4-rc, see the ChangeLog file.

Changes in version 0.4.6.5 - 2021-06-14

  • Major bugfixes (security):
    • Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on half-closed streams. Previously, clients failed to validate which hop sent these cells: this would allow a relay on a circuit to end a stream that wasn't actually built with it. Fixes bug 40389; bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021- 003 and CVE-2021-34548.
  • Major bugfixes (security, defense-in-depth):
    • Detect more failure conditions from the OpenSSL RNG code. Previously, we would detect errors from a missing RNG implementation, but not failures from the RNG code itself. Fortunately, it appears those failures do not happen in practice when Tor is using OpenSSL's default RNG implementation. Fixes bug 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.