56 lines
1.7 KiB
YAML
56 lines
1.7 KiB
YAML
id: ssh-weak-public-key
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info:
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name: SSH Host Keys < 2048 Bits Considered Weak
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author: pussycat0x
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severity: low
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description: |
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SSH host keys with a bit length below 2048 are deemed weak, posing an increased vulnerability to security threats. Employing robust key lengths is crucial for fortifying the integrity of encrypted communication and thwarting potential exploits.
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reference:
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- https://www.tenable.com/plugins/nessus/153954
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metadata:
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verified: true
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max-request: 2
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shodan-query: product:"OpenSSH"
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tags: js,ssh,misconfig,network
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variables:
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ecdsa_bit: '256' # 256 bytes = 2048 bits
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rsa_bit: '2048' # 2048 bits
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javascript:
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- pre-condition: |
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isPortOpen(Host,Port);
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code: |
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let m = require("nuclei/ssh");
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let c = m.SSHClient();
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let response = c.ConnectSSHInfoMode(Host, Port);
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to_json(response);
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args:
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Host: "{{Host}}"
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Port: "22"
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matchers-condition: and
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matchers:
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- type: word
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words:
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- "server_host_key"
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- type: dsl
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dsl:
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- 'len(ecdsa_keylen) != 0 && ecdsa_keylen < ecdsa_bit'
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- 'len(rsa_keylen) !=0 && rsa_keylen < rsa_bit'
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extractors:
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- type: json
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internal: true
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name: ecdsa_keylen
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json:
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- '.DHKeyExchange.server_host_key.ecdsa_public_key.length'
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- type: json
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internal: true
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name: rsa_keylen
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json:
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- '.DHKeyExchange.server_host_key.rsa_public_key.length'
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# digest: 4a0a004730450220182295db8e95167fc1926a95f9c7218bb099cda7d6a529e6615c1b34054c510d022100b751065f522e3d5ba4d8e41f0bacbbb5edbefcd27e7e5d946b57840a173ba3f0:922c64590222798bb761d5b6d8e72950 |