CVE-2021-29456

Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier, utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain, including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround, one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0.

CVSS v3 5.4 MEDIUM
CVSS v2.0 4.9 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

4.9^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:S/C:P/I:P/A:N

Exploitability : 6.8 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication SINGLE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j	Patch Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:authelia:authelia:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-04-21 19:15

Updated : 2024-02-04 21:47

NVD link : CVE-2021-29456

Mitre link : CVE-2021-29456

CVE.ORG link : CVE-2021-29456

JSON object : View

Products Affected

authelia

authelia

CWE

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

{"id": "CVE-2021-29456", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.9, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N", "authentication": "SINGLE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 4.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 6.8, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.3}, {"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.1}]}, "published": "2021-04-21T19:15:35.827", "references": [{"url": "https://github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-601"}]}], "descriptions": [{"lang": "en", "value": "Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier, utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain, including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround, one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0."}, {"lang": "es", "value": "Authelia es un servidor de autorizaci\u00f3n y autenticaci\u00f3n de c\u00f3digo abierto que proporciona autenticaci\u00f3n de 2 factores e inicio de sesi\u00f3n \u00fanico (SSO) para sus aplicaciones por medio de un portal web. En versiones 4.27.4 y anteriores, usando un par\u00e1metro de consulta HTTP, un atacante puede redireccionar a usuarios desde la aplicaci\u00f3n web a cualquier dominio, incluyendo sitios potencialmente maliciosos. Este problema de seguridad no afecta directamente la seguridad de la aplicaci\u00f3n web en s\u00ed. Como soluci\u00f3n alternativa, se puede usar un proxy inverso para eliminar el par\u00e1metro query del endpoint afectado. Se presenta un parche para versi\u00f3n 4.28.0"}], "lastModified": "2021-04-27T20:43:11.763", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:authelia:authelia:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8CE1C08B-D5C4-41B8-9C55-E08A07AF7FF4", "versionEndExcluding": "4.28.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}