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Improper Signature Verification Affecting golang.org/x/crypto/ssh Open this link in a new tab package, versions <0.0.0-20200220183623-bac4c82f6975

0.0
high

  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    Low

  • Confidentiality

    High

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  • snyk-id

    SNYK-GOLANG-GOLANGORGXCRYPTOSSH-551923

  • published

    21 Feb 2020

  • disclosed

    21 Feb 2020

  • credit

    Alex Gaynor

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Introduced: 21 Feb 2020

CVE-2020-9283 Open this link in a new tab
CWE-347 Open this link in a new tab

How to fix?

Upgrade golang.org/x/crypto/ssh to version 0.0.0-20200220183623-bac4c82f6975 or higher.

Overview

golang.org/x/crypto/ssh is a SSH client and server

Affected versions of this package are vulnerable to Improper Signature Verification. An attacker can craft an ssh-ed25519 or sk-ssh-...@openssh.com public key, such that the library will panic when trying to verify a signature with it. Clients can deliver such a public key and signature to any golang.org/x/crypto/ssh server with a PublicKeyCallback, and servers can deliver them to any golang.org/x/crypto/ssh client.