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CVE-2022-29245

6.5 · MEDIUM

SSH.NET is a Secure Shell (SSH) library for .NET.

Published May 31, 2022CWE-338EPSS 1.46%

Overview

CVE-2022-29245 is a medium-severity vulnerability. It was published on May 31, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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 `[email protected]` key exchange algorithms.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sshnet/SSH.NET/blob/bc99ada7da3f05f50d9379f2644941d91d5bf05a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs#L51GitHubgithub.com/sshnet/SSH.NET/commit/03c6d60736b8f7b42e44d6989a53f9b644a091fbGitHubgithub.com/sshnet/SSH.NET/releases/tag/2020.0.2GitHubgithub.com/sshnet/SSH.NET/security/advisories/GHSA-72p8-v4hg-v45pGitHubgithub.com/sshnet/SSH.NET/blob/bc99ada7da3f05f50d9379f2644941d91d5bf05a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs#L51GitHubgithub.com/sshnet/SSH.NET/commit/03c6d60736b8f7b42e44d6989a53f9b644a091fbGitHubgithub.com/sshnet/SSH.NET/releases/tag/2020.0.2GitHubgithub.com/sshnet/SSH.NET/security/advisories/GHSA-72p8-v4hg-v45p

How CyberStrike helps

Frequently asked questions

What is CVE-2022-29245?

CVE-2022-29245 is a medium-severity vulnerability. It was published on May 31, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2022-29245?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-29245?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-29245?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-29245 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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