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.
References
Link | Resource |
---|---|
https://github.com/sshnet/SSH.NET/blob/bc99ada7da3f05f50d9379f2644941d91d5bf05a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs#L51 | Exploit Third Party Advisory |
https://github.com/sshnet/SSH.NET/commit/03c6d60736b8f7b42e44d6989a53f9b644a091fb | Patch Third Party Advisory |
https://github.com/sshnet/SSH.NET/releases/tag/2020.0.2 | Release Notes Third Party Advisory |
https://github.com/sshnet/SSH.NET/security/advisories/GHSA-72p8-v4hg-v45p | Exploit Mitigation Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2022-05-31T16:35:11
Updated: 2022-05-31T16:35:11
Reserved: 2022-04-13T00:00:00
Link: CVE-2022-29245
JSON object: View
NVD Information
Status : Modified
Published: 2022-05-31T17:15:07.837
Modified: 2023-11-07T03:45:59.683
Link: CVE-2022-29245
JSON object: View
Redhat Information
No data.
CWE