CVE-2022-29245

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Summary

CVECVE-2022-29245
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-05-31 17:15:00 UTC
Updated2023-11-07 03:45:00 UTC
DescriptionSSH.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.

Risk And Classification

Problem Types: CWE-338

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Ssh.net Project Ssh.net 2020.0.0 - All All
Application Ssh.net Project Ssh.net 2020.0.0 beta1 All All
Application Ssh.net Project Ssh.net 2020.0.1 All All All

References

ReferenceSourceLinkTags
Weak private key generation · Advisory · sshnet/SSH.NET · GitHub CONFIRM github.com
Release 2020.0.2 · sshnet/SSH.NET · GitHub MISC github.com
Use cryptographically secure random number generator. · sshnet/SSH.NET@03c6d60 · GitHub MISC github.com
SSH.NET/KeyExchangeECCurve25519.cs at bc99ada7da3f05f50d9379f2644941d91d5bf05a · sshnet/SSH.NET · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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