Maintainers at the Tor Project have removed from its network more than 800 relay servers running outdated and EOL versions of the Tor software.
Currently, the Tor network is composed of more than 6000 relays, some of them running outdated Tor software versions (in some cases back to the 0.2.4.x versions). Other relays are running the latest Tor software in nightly builds and alpha releases. Maintainers of
Tor Project experts pointed out that they currently maintain only 5 Tor version series, 0.2.9.x (LTS), 0.3.5.x (LTS), 0.4.0.x, 0.4.1.x, 0.4.2.x (Stable on Dec 15th, 2019).
Now the maintainers of the project announced to have removed roughly 13.5% of the relay servers, 750 acting as Tor middle relays and 62 as exit relays.
The presence of End-Of-Life relays in the Tor Network has multiple negative impacts on network stability and security, it
“In the past weeks, we’ve taken steps to contact every relay operator with a valid ContactInfo field to ask them to upgrade to the latest stable release. The Tor relay community was informed via the
“The End-Of-Life relays in the network currently make up just over 12% of the total bandwidth, or around 750 relays. Out of these, only 62 are Exit relays accounting for only 1.68% of the total Exit traffic. We expect a minor impact on the size of the network, and a small drop in the Metrics graph.”
The maintainers expect a new Tor stable release in November, it will reject End-Of-Life relays by default. Until then, the maintainers will reject obsolete relays using their fingerprints.
Instruction to upgrading End-Of-Life relays are included in the announcement.
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