Improper Signature Verification Affecting golang.org/x/crypto/ssh Open this link in a new tab package, versions <0.0.0-20200220183623-bac4c82f6975
Exploit Maturity
Proof of concept
Attack Complexity
Low
Confidentiality
High
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snyk-id
SNYK-GOLANG-GOLANGORGXCRYPTOSSH-551923
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published
21 Feb 2020
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disclosed
21 Feb 2020
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credit
Alex Gaynor
Introduced: 21 Feb 2020
CVE-2020-9283 Open this link in a new tabHow 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.