PT-2020-20191 · Tor+2 · Tor+2

Cypherpunks · Published 2020-02-02 · Updated 2024-08-04 · CVE-2020-8516

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Tor versions 0.4.1.8 and 0.4.2.x through 0.4.2.6

Description The daemon in Tor 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. The network team of Tor claims this is an intended behavior and not a vulnerability.

Recommendations For Tor versions 0.4.1.8, consider updating to a version where this behavior is addressed, if available. For Tor versions 0.4.2.x through 0.4.2.6, consider updating to a version where this behavior is addressed, if available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Related Identifiers

ALT-PU-2020-1525

ALT-PU-2020-2702

CVE-2020-8516

Affected Products

Alt Linux

Debian

Tor

References · 13

• 🔥 https://hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-8516 · Security Note
• https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-8516 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-8516 · Vendor Advisory
• https://trac.torproject.org/projects/tor/ticket/33129 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-8516 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-8516 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-8516 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-8516 · Security Note
• https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html · Vendor Advisory
• https://t.me/cvenotify/76357 · Telegram Post
• https://t.me/cvenotify/88936 · Telegram Post