cvelist/2022/29xxx/CVE-2022-29245.json

{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2022-29245",
        "STATE": "PUBLIC",
        "TITLE": "Weak private key generation in SSH.NET"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "SSH.NET",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": ">= 2020.0.0, < 2020.0.2"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "sshnet"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "SSH.NET is a Secure Shell (SSH) library for .NET. In versions 2020.0.0 and 2020.0.1, during an `X25519` key exchange, the client’s private key is generated with `System.Random`. `System.Random` is not a cryptographically secure random number generator, it must therefore not be used for cryptographic purposes. When establishing an SSH connection to a remote host, during the X25519 key exchange, the private key is generated with a weak random number generator whose seed can be brute forced. This allows an attacker who is able to eavesdrop on the communications to decrypt them. Version 2020.0.2 contains a patch for this issue. As a workaround, one may disable support for `curve25519-sha256` and `curve25519-sha256@libssh.org` key exchange algorithms."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/sshnet/SSH.NET/security/advisories/GHSA-72p8-v4hg-v45p",
                "refsource": "CONFIRM",
                "url": "https://github.com/sshnet/SSH.NET/security/advisories/GHSA-72p8-v4hg-v45p"
            },
            {
                "name": "https://github.com/sshnet/SSH.NET/commit/03c6d60736b8f7b42e44d6989a53f9b644a091fb",
                "refsource": "MISC",
                "url": "https://github.com/sshnet/SSH.NET/commit/03c6d60736b8f7b42e44d6989a53f9b644a091fb"
            },
            {
                "name": "https://github.com/sshnet/SSH.NET/blob/bc99ada7da3f05f50d9379f2644941d91d5bf05a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs#L51",
                "refsource": "MISC",
                "url": "https://github.com/sshnet/SSH.NET/blob/bc99ada7da3f05f50d9379f2644941d91d5bf05a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs#L51"
            },
            {
                "name": "https://github.com/sshnet/SSH.NET/releases/tag/2020.0.2",
                "refsource": "MISC",
                "url": "https://github.com/sshnet/SSH.NET/releases/tag/2020.0.2"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-72p8-v4hg-v45p",
        "discovery": "UNKNOWN"
    }
}