Vulnerability Monitor

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CVE-2020-8516

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

Published

2020-02-02T13:15:10.903

Last Modified

2024-11-21T05:38:58.863

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	torproject	tor	≤ 0.4.1.8	Yes
Application	torproject	tor	≤ 0.4.2.6	Yes

References

https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html Mailing List, Vendor Advisory ([email protected])
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html Mailing List, Vendor Advisory ([email protected])
https://security-tracker.debian.org/tracker/CVE-2020-8516 Third Party Advisory ([email protected])
https://trac.torproject.org/projects/tor/ticket/33129 Issue Tracking, Vendor Advisory ([email protected])
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html Exploit, Mitigation, Technical Description, Third Party Advisory ([email protected])
https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html Mailing List, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html Mailing List, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security-tracker.debian.org/tracker/CVE-2020-8516 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://trac.torproject.org/projects/tor/ticket/33129 Issue Tracking, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html Exploit, Mitigation, Technical Description, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)