CVE-2020-8516

NameCVE-2020-8516
Description** DISPUTED ** 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tor (PTS)stretch0.2.9.16-1vulnerable
stretch (security)0.2.9.15-1vulnerable
buster, buster (security)0.3.5.10-1vulnerable
bullseye, sid0.4.3.5-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
torsource(unstable)(unfixed)unimportant

Notes

Not considered a bug / explicit design choice by upstream
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html
https://trac.torproject.org/projects/tor/ticket/33129
http://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html

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