cloudflare | Tor Blog

Q and A with An East African Human Rights Activist

 Can you tell us about your work?

19 comments

The Trouble with CloudFlare

Wednesday, CloudFlare blogged that 94% of the requests it sees from Tor are "malicious." We find that unlikely, and we

205 comments

Study: What is the value of anonymous communication?

Drexel University researchers in Philadelphia, Pennsylvania are recruiting Tor users for an interview study to see how they use Tor while creating things online—how they write blog posts, edit Wiki

53 comments

Upcoming Events

July 27, 2020 - July 31, 2020

Rightscon online

August 11, 2020 - August 18, 2020

Bornhack (DK)

August 12, 2020 - August 14, 2020

Walking Onions @ USENIX Security Symposium '20

See All Upcoming Events

Recent Updates

#MoreOnionsPorfavor: Onionize your website and take back the internet

Starting today, July 8th, the Tor Project is running a one month campaign called #MoreOnionsPorfavor to raise awareness about onion sites, that is, websites

New releases: Tor 0.3.5.11, 0.4.2.8, and 0.4.3.6 (with security fixes)

We have new stable releases today. If you build Tor from source, you can download the source code for 0.4.3.6 on the website. Packages should be available within the next several weeks, with a new Tor Browser by the end of the month.

There are also updated versions for older supported series. You can download 0.3.5.11 and 0.4.2.8 at https://dist.torproject.org/.

These releases fix 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. (If you are running a version of Tor built with OpenSSL, this bug does not affect your installation.)

Tor 0.4.3.6 backports several bugfixes from later releases, including some affecting usability. Below are the changes in 0.4.3.6. You can also read the changes in 0.3.5.11 and the changes in 0.4.2.8.

Changes in version 0.4.3.6 - 2020-07-09

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.
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.

New alpha release: Tor 0.4.4.2-alpha

There's a new alpha release available for download. If you build Tor from source, you can download the source code for 0.4.4.2-alpha from the download page on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release around the end of the month.

Remember, this is an alpha release: you should only run this if you'd like to find and report more bugs than usual.

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. If you're running with OpenSSL, this bug doesn't affect your Tor.

Changes in version 0.4.4.2-alpha - 2020-07-09

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.
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.

Anti-censorship team report: June 2020

Tor's anti-censorship team writes monthly reports to keep the world updated on its progress. This blog post summarizes the anti-censorship work we got done in June 2020.