CVE-2020-8516 - Vulnerability Details - OpenCVE

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

Published: 2020-02-02

Score: 5.3 Medium

EPSS: 1.1% Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:torproject:tor::::::::
	cpe:2.3:a:torproject:tor::::::::

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact None

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.01117.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html
https://security-tracker.debian.org/tracker/CVE-2020-8516
https://trac.torproject.org/projects/tor/ticket/33129
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html

History

No history.

Subscriptions

Torproject Tor

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2020-02-02T12:52:56.000Z

Updated: 2024-08-04T10:03:45.879Z

Reserved: 2020-02-02T00:00:00.000Z

Link: CVE-2020-8516

Vulnrichment

No data.

NVD

Status : Modified

Published: 2020-02-02T13:15:10.903

Modified: 2024-11-21T05:38:58.863

Link: CVE-2020-8516

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

NVD-CWE-noinfo

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "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"}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2020-02-10T17:14:48.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html"}, {"tags": ["x_refsource_MISC"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html"}, {"tags": ["x_refsource_MISC"], "url": "https://security-tracker.debian.org/tracker/CVE-2020-8516"}, {"tags": ["x_refsource_MISC"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html"}, {"tags": ["x_refsource_MISC"], "url": "https://trac.torproject.org/projects/tor/ticket/33129"}], "tags": ["disputed"], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2020-8516", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "** 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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html", "refsource": "MISC", "url": "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html"}, {"name": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html", "refsource": "MISC", "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html"}, {"name": "https://security-tracker.debian.org/tracker/CVE-2020-8516", "refsource": "MISC", "url": "https://security-tracker.debian.org/tracker/CVE-2020-8516"}, {"name": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html", "refsource": "MISC", "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html"}, {"name": "https://trac.torproject.org/projects/tor/ticket/33129", "refsource": "MISC", "url": "https://trac.torproject.org/projects/tor/ticket/33129"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T10:03:45.879Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://security-tracker.debian.org/tracker/CVE-2020-8516"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://trac.torproject.org/projects/tor/ticket/33129"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2020-8516", "datePublished": "2020-02-02T12:52:56.000Z", "dateReserved": "2020-02-02T00:00:00.000Z", "dateUpdated": "2024-08-04T10:03:45.879Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*", "matchCriteriaId": "A433651E-DAE8-44B3-AB2F-069776068357", "versionEndIncluding": "0.4.1.8", "vulnerable": true}, {"criteria": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*", "matchCriteriaId": "2DE290F9-C6B7-4D2C-B7E5-CAB1E9D3A7E6", "versionEndIncluding": "0.4.2.6", "versionStartIncluding": "0.4.2.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [{"sourceIdentifier": "cve@mitre.org", "tags": ["disputed"]}], "descriptions": [{"lang": "en", "value": "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"}, {"lang": "es", "value": "** EN DISPUTA ** El demonio en Tor hasta la versi\u00f3n 0.4.1.8 y versiones 0.4.2.x hasta la versi\u00f3n 0.4.2.6, no comprueba que un nodo rendezvous sea conocido antes de intentar conectarse a \u00e9l, lo que podr\u00eda facilitar a atacantes remotos descubrir informaci\u00f3n del circuito. NOTA: El equipo de red de Tor afirma que este es un comportamiento previsto y no una vulnerabilidad."}], "id": "CVE-2020-8516", "lastModified": "2024-11-21T05:38:58.863", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-02-02T13:15:10.903", "references": [{"source": "cve@mitre.org", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://security-tracker.debian.org/tracker/CVE-2020-8516"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://trac.torproject.org/projects/tor/ticket/33129"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Mitigation", "Technical Description", "Third Party Advisory"], "url": "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Vendor Advisory"], "url": "https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security-tracker.debian.org/tracker/CVE-2020-8516"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://trac.torproject.org/projects/tor/ticket/33129"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mitigation", "Technical Description", "Third Party Advisory"], "url": "https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}