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CVE-2020-9283 is a denial-of-service vulnerability in the SSH package of Go's golang.org/x/crypto library before version v0.0.0-20200220183623-bac4c82f6975. During signature verification, processing a crafted ssh-ed25519 or sk-ssh-ed25519 public key can trigger a panic. A malicious SSH client can target a server that uses PublicKeyCallback, while a malicious SSH server can target a vulnerable SSH client.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository is a Go-based proof-of-concept exploit for CVE-2020-9283, a vulnerability in the Go SSH library (golang.org/x/crypto/ssh) that allows a remote attacker to cause a panic (crash) in a vulnerable SSH server by sending a malformed ed25519 public key during authentication. The repository contains several Go source files, including modified versions of the Go SSH library's client and transport logic (as .bak files), and a main.go file that serves as the entry point for the exploit. The exploit is executed by specifying the target SSH server's host, port, and a private key file (default: 'thekey'). The main attack vector is network-based, targeting the SSH service (default port 22). The payload is a hardcoded, malformed SSH authentication request that triggers the panic on the server. The exploit does not provide post-exploitation capabilities; its sole purpose is to demonstrate and trigger the denial-of-service condition. The repository is structured for easy building and testing, with a Makefile for cross-platform compilation and clear instructions in the README.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A crafted SSH Ed25519 public-key handling flaw in golang.org/x/crypto that can cause a panic, resulting in denial of service.
A flaw in golang.org/x/crypto where processing crafted SSH Ed25519 public keys can cause a panic.
A denial-of-service flaw in golang.org/x/crypto in which processing crafted ssh-ed25519 public keys can cause a panic.
A denial-of-service vulnerability in golang.org/x/crypto where processing a crafted ssh-ed25519 public key can cause a panic.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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