CVE-2020-26263

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In tlslite-ng before versions 0.7.6 and 0.8.0-alpha39, the code that performs decryption and padding check in RSA PKCS#1 v1.5 decryption is data dependant. In particular, the code has multiple ways in which it leaks information about the decrypted ciphertext. It aborts as soon as the plaintext doesn't start with 0x00, 0x02. All TLS servers that enable RSA key exchange as well as applications that use the RSA decryption API directly are vulnerable. This is patched in versions 0.7.6 and 0.8.0-alpha39. Note: the patches depend on Python processing the individual bytes in side-channel free manner, this is known to not the case (see reference). As such, users that require side-channel resistance are recommended to use different TLS implementations, as stated in the security policy of tlslite-ng."}, {"lang": "es", "value": "tlslite-ng es una biblioteca de Python de c\u00f3digo abierto que implementa protocolos criptogr\u00e1ficos SSL y TLS.&#xa0;En tlslite-ng versiones anteriores a 0.7.6 y 0.8.0-alpha39, el c\u00f3digo que lleva a cabo el descifrado y la comprobaci\u00f3n de relleno en el descifrado RSA PKCS#1 versi\u00f3n v1.5 es dependiente de los datos.&#xa0;En particular, el c\u00f3digo presenta varias formas en la cual se filtra informaci\u00f3n sobre el texto cifrado descifrado.&#xa0;Anula tan pronto como el texto plano no comience con 0x00, 0x02.&#xa0;Todos los servidores TLS que permiten el intercambio de claves RSA, as\u00ed como las aplicaciones que usan la API de descifrado RSA directamente, son vulnerables.&#xa0;Esto est\u00e1 parcheado en las versiones 0.7.6 y 0.8.0-alpha39.&#xa0;Nota: los parches dependen de que Python procese los bytes individuales de manera libre de canal lateral, se sabe que este no es el caso (ver referencia).&#xa0;Como tal, se recomienda a los usuarios que requieren resistencia de canal lateral que utilicen diferentes implementaciones de TLS"}], "id": "CVE-2020-26263", "lastModified": "2026-06-17T03:07:57.120", "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}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", 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