{ "containers": { "cna": { "affected": [ { "product": "security-advisories", "vendor": "nextcloud", "versions": [ { "status": "affected", "version": "< 3.3.0" } ] } ], "descriptions": [ { "lang": "en", "value": "The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading." } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-295", "description": "CWE-295: Improper Certificate Validation", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-09-19T23:06:11.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M" }, "references": [ { "tags": [ "x_refsource_MISC" ], "url": "https://hackerone.com/reports/1189162" }, { "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/nextcloud/desktop/pull/3338" }, { "name": "DSA-4974", "tags": [ "vendor-advisory", "x_refsource_DEBIAN" ], "url": "https://www.debian.org/security/2021/dsa-4974" } ], "source": { "advisory": "GHSA-f5fr-5gcv-6cc5", "discovery": "UNKNOWN" }, "title": "End-to-end encryption device setup did not verify public key", "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-32728", "STATE": "PUBLIC", "TITLE": "End-to-end encryption device setup did not verify public key" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "security-advisories", "version": { "version_data": [ { "version_value": "< 3.3.0" } ] } } ] }, "vendor_name": "nextcloud" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading." } ] }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-295: Improper Certificate Validation" } ] } ] }, "references": { "reference_data": [ { "name": "https://hackerone.com/reports/1189162", "refsource": "MISC", "url": "https://hackerone.com/reports/1189162" }, { "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5", "refsource": "CONFIRM", "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5" }, { "name": "https://github.com/nextcloud/desktop/pull/3338", "refsource": "MISC", "url": "https://github.com/nextcloud/desktop/pull/3338" }, { "name": "DSA-4974", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4974" } ] }, "source": { "advisory": "GHSA-f5fr-5gcv-6cc5", "discovery": "UNKNOWN" } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T23:33:54.918Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://hackerone.com/reports/1189162" }, { "tags": [ "x_refsource_CONFIRM", "x_transferred" ], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/nextcloud/desktop/pull/3338" }, { "name": "DSA-4974", "tags": [ "vendor-advisory", "x_refsource_DEBIAN", "x_transferred" ], "url": "https://www.debian.org/security/2021/dsa-4974" } ] } ] }, "cveMetadata": { "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-32728", "datePublished": "2021-08-18T16:00:13.000Z", "dateReserved": "2021-05-12T00:00:00.000Z", "dateUpdated": "2024-08-03T23:33:54.918Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }