{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-1544", "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "state": "PUBLISHED", "assignerShortName": "wolfSSL", "dateReserved": "2024-02-15T17:38:16.603Z", "datePublished": "2024-08-27T18:44:52.770Z", "dateUpdated": "2024-08-27T19:14:35.190Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "product": "wolfSSL", "programFiles": ["wolfcrypt/src/ecc.c"], "vendor": "wolfSSL", "versions": [{"lessThanOrEqual": "5.6.4", "status": "affected", "version": "0", "versionType": "Release"}]}], "credits": [{"lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Florian Sieck, Luca Wilke and Thomas Eisenbarth from Universit\u00e4t zu L\u00fcbeck"}], "datePublic": "2024-07-08T17:30:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Generating the ECDSA nonce k samples a random number r and then <br>truncates this randomness with a modular reduction mod n where n is the <br>order of the elliptic curve. Meaning k = r mod n. The division used <br>during the reduction estimates a factor q_e by dividing the upper two <br>digits (a digit having e.g. a size of 8 byte) of r by the upper digit of <br>n and then decrements q_e in a loop until it has the correct size. <br>Observing the number of times q_e is decremented through a control-flow <br>revealing side-channel reveals a bias in the most significant bits of <br>k. Depending on the curve this is either a negligible bias or a <br>significant bias large enough to reconstruct k with lattice reduction <br>methods. For SECP160R1, e.g., we find a bias of 15 bits."}], "value": "Generating the ECDSA nonce k samples a random number r and then \ntruncates this randomness with a modular reduction mod n where n is the \norder of the elliptic curve. Meaning k = r mod n. The division used \nduring the reduction estimates a factor q_e by dividing the upper two \ndigits (a digit having e.g. a size of 8 byte) of r by the upper digit of \nn and then decrements q_e in a loop until it has the correct size. \nObserving the number of times q_e is decremented through a control-flow \nrevealing side-channel reveals a bias in the most significant bits of \nk. Depending on the curve this is either a negligible bias or a \nsignificant bias large enough to reconstruct k with lattice reduction \nmethods. For SECP160R1, e.g., we find a bias of 15 bits."}], "impacts": [{"descriptions": [{"lang": "en", "value": "Information Disclosure"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 4.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-203", "description": "CWE-203 Observable Discrepancy", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "shortName": "wolfSSL", "dateUpdated": "2024-08-27T18:44:52.770Z"}, "references": [{"url": "https://github.com/wolfSSL/wolfssl/releases/tag/v5.7.2-stable"}], "source": {"discovery": "EXTERNAL"}, "title": "ECDSA nonce bias caused by truncation", "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-08-27T19:14:00.889289Z", "id": "CVE-2024-1544", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-08-27T19:14:35.190Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Generating the ECDSA nonce k samples a random number r and then \ntruncates this randomness with a modular reduction mod n where n is the \norder of the elliptic curve. Meaning k = r mod n. The division used \nduring the reduction estimates a factor q_e by dividing the upper two \ndigits (a digit having e.g. a size of 8 byte) of r by the upper digit of \nn and then decrements q_e in a loop until it has the correct size. \nObserving the number of times q_e is decremented through a control-flow \nrevealing side-channel reveals a bias in the most significant bits of \nk. Depending on the curve this is either a negligible bias or a \nsignificant bias large enough to reconstruct k with lattice reduction \nmethods. For SECP160R1, e.g., we find a bias of 15 bits."}, {"lang": "es", "value": "Generar el nonce k ECDSA muestra un n\u00famero aleatorio r y luego trunca esta aleatoriedad con una reducci\u00f3n modular mod n donde n es el orden de la curva el\u00edptica. Significado k = r mod n. La divisi\u00f3n utilizada durante la reducci\u00f3n estima un factor q_e dividiendo los dos d\u00edgitos superiores (un d\u00edgito que tiene, por ejemplo, un tama\u00f1o de 8 bytes) de r por el d\u00edgito superior de n y luego disminuye q_e en un bucle hasta que tenga el tama\u00f1o correcto. Observar el n\u00famero de veces que q_e disminuye a trav\u00e9s de un canal lateral revelador de flujo de control revela un sesgo en los bits m\u00e1s significativos de k. Dependiendo de la curva, esto es un sesgo insignificante o un sesgo significativo lo suficientemente grande como para reconstruir k con m\u00e9todos de reducci\u00f3n de celos\u00eda. Para SECP160R1, por ejemplo, encontramos un sesgo de 15 bits."}], "id": "CVE-2024-1544", "lastModified": "2024-08-28T12:57:39.090", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 4.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 0.5, "impactScore": 3.6, "source": "facts@wolfssl.com", "type": "Secondary"}]}, "published": "2024-08-27T19:15:16.547", "references": [{"source": "facts@wolfssl.com", "url": "https://github.com/wolfSSL/wolfssl/releases/tag/v5.7.2-stable"}], "sourceIdentifier": "facts@wolfssl.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-203"}], "source": "facts@wolfssl.com", "type": "Secondary"}]}

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