Vulnerability Information
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Vulnerability Title
cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
Vulnerability Description
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the public_key_from_numbers (or EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() and load_pem_public_key() functions do not verify that the point belongs to the expected prime-order subgroup of the curve. This missing validation allows an attacker to provide a public key point P from a small-order subgroup. This can lead to security issues in various situations, such as the most commonly used signature verification (ECDSA) and shared key negotiation (ECDH). When the victim computes the shared secret as S = [victim_private_key]P via ECDH, this leaks information about victim_private_key mod (small_subgroup_order). For curves with cofactor > 1, this reveals the least significant bits of the private key. When these weak public keys are used in ECDSA , it's easy to forge signatures on the small subgroup. Only SECT curves are impacted by this. This vulnerability is fixed in 46.0.5.
CVSS Information
N/A
Vulnerability Type
对数据真实性的验证不充分
Vulnerability Title
cryptography 安全漏洞
Vulnerability Description
cryptography是Python Cryptographic Authority开源的一个Python的加密库。 cryptography 46.0.5之前版本存在安全漏洞，该漏洞源于多个公钥相关函数未验证点是否属于曲线的预期素数阶子群，可能导致私钥信息泄露或签名伪造。
CVSS Information
N/A
Vulnerability Type
N/A