CVE-2017-7843

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IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting. This vulnerability affects Firefox ESR < 52.5.2 and Firefox < 57.0.1."}, {"lang": "es", "value": "Cuando se utiliza el modo Navegaci\u00f3n Privada, es posible que un trabajador web escriba datos persistentes en IndexedDB y realice fingerprinting en un usuario de forma \u00fanica. IndexedDB no deber\u00eda estar disponible en modo Navegaci\u00f3n Privada y estos datos almacenados persistir\u00e1n en varias sesiones en modo Navegaci\u00f3n Privada porque no se borran al cerrar. Esta vulnerabilidad afecta a las versiones anteriores a la 52.5.2 de Firefox ESR y las versiones anteriores a la 57.0.1 de Firefox."}], "id": "CVE-2017-7843", "lastModified": "2026-06-17T01:25:19.460", "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}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-06-11T21:29:11.920", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/102039"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/102112"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039954"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2017:3382"}, {"source": "security@mozilla.org", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1410106"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2017/12/msg00003.html"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2017/dsa-4062"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2017-27/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2017-28/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/102039"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/102112"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039954"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2017:3382"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1410106"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2017/12/msg00003.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2017/dsa-4062"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2017-27/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2017-28/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Konark as the original reporter.", "affected_release": [{"advisory": "RHSA-2017:3382", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "firefox-0:52.5.1-1.el6_9", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2017-12-05T00:00:00Z"}, {"advisory": "RHSA-2017:3382", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:52.5.1-1.el7_4", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2017-12-05T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Web worker in Private Browsing mode can write IndexedDB data", "id": "1518566", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1518566"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-212", "details": ["When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting. This vulnerability affects Firefox ESR < 52.5.2 and Firefox < 57.0.1.", "A privacy flaw was discovered in Firefox. In Private Browsing mode, a web worker could write persistent data to IndexedDB, which was not cleared when exiting and would persist across multiple sessions. A malicious website could exploit the flaw to bypass private-browsing protections and uniquely fingerprint visitors."], "name": "CVE-2017-7843", "public_date": "2017-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-7843\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-7843\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2017-27/#CVE-2017-7843"], "threat_severity": "Important"}

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