cups-browsed binds to `INADDR_ANY:631`, trusting any packet from any source

Vulnerability 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. When combined with other vulnerabilities, such as CVE-2024-47076, CVE-2024-47175, and CVE-2024-47177, an attacker can execute arbitrary commands remotely on the target machine without authentication when a malicious printer is printed to.

References

• https://github.com/OpenPrinting/cups-browsed/security/advisories/GHSA-rj88-6mr5-rcw8
• https://github.com/OpenPrinting/cups-filters/security/advisories/GHSA-p9rh-jxmq-gq47
• https://github.com/OpenPrinting/libcupsfilters/security/advisories/GHSA-w63j-6g73-wmg5
• https://github.com/OpenPrinting/libppd/security/advisories/GHSA-7xfx-47qg-grp6
• https://github.com/OpenPrinting/cups-browsed/blob/master/daemon/cups-browsed.c#L13992
• https://www.cups.org
• https://www.evilsocket.net/2024/09/26/Attacking-UNIX-systems-via-CUPS-Part-I