CVE-2018-20187

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*", "matchCriteriaId": "2D1FAA67-A163-4976-B133-2A6281733EA1", "versionEndExcluding": "2.9.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement."}, {"lang": "es", "value": "Se ha detectado un fallo de canal lateral en Botan en versiones anteriores a la 2.9.0. Un atacante que sea capaz de medir con precisi\u00f3n el tiempo que tarda en generarse una clave ECC podr\u00eda ser capaz de obtener informaci\u00f3n sobre el alto n\u00famero de bits de la clave secreta, ya que la funci\u00f3n para obtener el punto p\u00fablico del escalar secreto emplea una \"escalera de Montgomery\", cuya iteraci\u00f3n de bucles depende de la longitud de bits del secreto. Esto afecta solamente a la generaci\u00f3n de claves y no a las firmas ECDSA y concordancia de claves ECDH."}], "id": "CVE-2018-20187", "lastModified": "2026-06-17T01:52:25.623", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2019-03-08T19:29:00.250", "references": [{"source": "cve@mitre.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://botan.randombit.net/news.html"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://botan.randombit.net/security.html"}, {"source": "cve@mitre.org", "tags": ["Not Applicable", "Third Party Advisory"], "url": "https://github.com/crocs-muni/ECTester"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://botan.randombit.net/news.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://botan.randombit.net/security.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Not Applicable", "Third Party Advisory"], "url": "https://github.com/crocs-muni/ECTester"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-320"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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