Description
The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tor | No fix yet | — |
| Debian 13 | tor | No fix yet | — |
| Debian 12 | tor | No fix yet | — |
References
- https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html
- https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html
- https://security-tracker.debian.org/tracker/CVE-2020-8516
- https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html
- https://trac.torproject.org/projects/tor/ticket/33129