CVE-2026-50721— The Libreswan Project libreswan 加密问题漏洞

IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload

Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of the authentication hash when the SIG payload of an IKEv1 packet was encoded using PKCS #1 RSA Encryption as per RFC 2313. A remote attacker can use a variation on the Bleichenbacher attack to forge the SIG payload when small public exponents are being used (e.g., e=3), which could lead to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the SIG payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of remote IKE peers are not affected.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

密码学签名的验证不恰当

The Libreswan Project libreswan 加密问题漏洞

The Libreswan Project libreswan是The Libreswan Project组织的一个VPN安全通信软件。 The Libreswan Project libreswan 5.3及之前版本存在安全漏洞，该漏洞源于函数RSA_authenticate_hash_signature_raw_rsa()未正确验证IKEv1数据包SIG有效载荷的认证哈希长度，可能导致远程攻击者利用bleichenbacher攻击变体在公钥指数较小（如e=3）时伪造SIG有效载荷，从而造成冒充攻击；此

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