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49 lines
1.7 KiB
YAML
49 lines
1.7 KiB
YAML
id: x11-unauth-access
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info:
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name: x11 - Unauthenticated Access
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author: pussycat0x
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severity: high
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description: |
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To check if you can connect to a remote X server, send an X11 initial connection request to TCP port 6000+n (where n is the display number). The response success byte (0x00 or 0x01) indicates if you are allowed; if successful, the script will display "X server access is granted," confirming that an attacker can connect to the X server
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reference:
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- https://nmap.org/nsedoc/scripts/x11-access.html
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- https://book.hacktricks.xyz/network-services-pentesting/6000-pentesting-x11
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- https://www.hackingarticles.in/penetration-testing-on-x11-server/
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metadata:
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shodan-query: "Open X Server:"
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verified: true
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max-request: 1
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tags: x11,network,js,remote,unauth
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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 packet = bytes.NewBuffer();
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const c = require("nuclei/net");
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const cmd = "l\u0000\u000b\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"
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packet.WriteString(cmd)
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let conn = c.Open('tcp', `${Host}:${Port}`);
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conn.SendHex(packet.Hex());
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const result = conn.RecvFull();
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let accessGranted;
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if (result.length >= 8 && result[0] === 1 ) {
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accessGranted = "x11 Unauth Access - Detected";
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} else {
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conn.Close();
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}
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accessGranted
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args:
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Host: "{{Host}}"
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Port: 6000
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extractors:
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- type: dsl
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dsl:
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- response
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# digest: 4b0a00483046022100c696807b3b3c112918e59cac69b70d84044d833a81179d80c3ac6049183762ec022100981e17d29d9ad56fc4422211182584c73653648725dd570204a9a3b03e7eb12a:922c64590222798bb761d5b6d8e72950 |