CVE-2021-39246

Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are logged locally, and an attacker might be able to compare them to timestamp data collected by the destination server (or collected by a rogue site within the Tor network).

CVSS v3 6.1 MEDIUM
CVSS v2.0 3.6 LOW

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.9 / Impact : 5.2

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

3.6^/10

CVSS v2.0 : LOW

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

Exploitability : 3.9 / Impact : 4.9

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md	Exploit Third Party Advisory
https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9	Patch Vendor Advisory
https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434	Vendor Advisory
https://sick.codes/sick-2021-111	Exploit Third Party Advisory
https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability	Third Party Advisory

Configurations

Configuration 1 (hide)

AND

OR	cpe:2.3:a:torproject:tor_browser::::::::
	cpe:2.3:a:torproject:tor_browser:11.0:alpha2::::::
	cpe:2.3:a:torproject:tor_browser:11.0:alpha4::::::

OR	cpe:2.3:o:apple:macos:-:::::::*
	cpe:2.3:o:linux:linux_kernel:-:::::::*
	cpe:2.3:o:microsoft:windows:-:::::::*

History

No history.

Information

Published : 2021-09-24 19:15

Updated : 2024-02-28 18:48

NVD link : CVE-2021-39246

Mitre link : CVE-2021-39246

CVE.ORG link : CVE-2021-39246

JSON object : View

Products Affected

linux

linux_kernel

apple

macos

microsoft

windows

torproject

tor_browser

CWE

CWE-532

Insertion of Sensitive Information into Log File

{"id": "CVE-2021-39246", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 3.6, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 4.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "PHYSICAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 0.9}]}, "published": "2021-09-24T19:15:07.147", "references": [{"url": "https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9", "tags": ["Patch", "Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://sick.codes/sick-2021-111", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-532"}]}], "descriptions": [{"lang": "en", "value": "Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are logged locally, and an attacker might be able to compare them to timestamp data collected by the destination server (or collected by a rogue site within the Tor network)."}, {"lang": "es", "value": "Tor Browser hasta la versi\u00f3n 10.5.6 y la versi\u00f3n 11.x hasta la 11.0a4 permite un ataque de correlaci\u00f3n que puede comprometer la privacidad de las visitas a las direcciones v2 de la cebolla. Las marcas de tiempo exactas de estas visitas al servicio de cebolla se registran localmente, y un atacante podr\u00eda ser capaz de compararlas con los datos de las marcas de tiempo recogidas por el servidor de destino (o recogidas por un sitio falso dentro de la red Tor)"}], "lastModified": "2021-10-01T13:00:50.353", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:torproject:tor_browser:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2A501C7-B8B3-4E18-9538-25DEDF2A644F", "versionEndIncluding": "10.5.6"}, {"criteria": "cpe:2.3:a:torproject:tor_browser:11.0:alpha2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "45031E29-6854-481E-9D53-5D2EACF3BA03"}, {"criteria": "cpe:2.3:a:torproject:tor_browser:11.0:alpha4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "48C405F5-103C-4FE3-A066-DE1BE00CDC7D"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}