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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: CUPS-browsed binds to `INADDR_ANY:631` (UDP), trusting ANY source. ๐ก **Consequences**: Attackers send malicious IPP requests to controlled URLs.โฆ
๐ก๏ธ **CWE**: CWE-1327 (Improper Restriction of Print Image Rendering). ๐ **Flaw**: The daemon binds to all interfaces without source validation. ๐ซ **Result**: It blindly trusts packets from any IP address on the network.
Q3Who is affected? (Versions/Components)
๐ข **Vendor**: OpenPrinting. ๐จ๏ธ **Product**: `cups-browsed` (part of CUPS). ๐ง **OS**: Unix/Linux systems running the CUPS printing system. โ ๏ธ **Scope**: Any instance where `cups-browsed` is active and bound to UDP 631.
Q4What can hackers do? (Privileges/Data)
๐ **Privileges**: Exploits run as **ROOT**. ๐จ๏ธ **Action**: Remote addition of printers. ๐ **Data**: Triggers HTTP callbacks to attacker-controlled servers.โฆ
๐ **Threshold**: LOW. ๐ **Auth**: None required (PR:N). ๐ **Access**: Network level (AV:N). ๐ฑ๏ธ **UI**: No user interaction needed (UI:N). ๐ฏ **AC**: Low complexity. Easy to exploit remotely.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ฅ **Public Exp**: YES. Multiple PoCs available on GitHub. ๐ ๏ธ **Tools**: `spill`, `CVE-2024-47176-Scanner`, Python scripts. ๐ **Status**: Wild exploitation possible via simple UDP packet sends to port 631.
Q7How to self-check? (Features/Scanning)
๐ **Check**: Scan UDP port 631. ๐ก **Method**: Send crafted IPP request & listen for HTTP callback. ๐งฐ **Tools**: Use Go-based scanners (`spill`) or Python scripts.โฆ
๐ง **Workaround**: Disable `cups-browsed` service if not needed. ๐ซ **Network**: Block UDP 631 inbound from untrusted networks. ๐ **Config**: Restrict binding to localhost (`127.0.0.1`) if possible.โฆ