CVE-2024-47175

A security vulnerability was found in OpenPrinting CUPS.

The function ppdCreatePPDFromIPP2 in the libppd library is responsible for generating a PostScript Printer Description (PPD) file based on attributes retrieved from an Internet Printing Protocol (IPP) response. Essentially, it takes printer information, usually obtained via IPP, and creates a corresponding PPD file that describes the printer's capabilities (such as supported media sizes, resolutions, color modes, etc.).

PPD files are used by printing systems like CUPS (Common Unix Printing System) to communicate with and configure printers. They provide a standardized format that allows different printers to work with the printing system in a consistent way.

The ppdCreatePPDFromIPP2 function in libppd doesn't properly check or clean IPP attributes before writing them to a temporary PPD file. This means that a remote attacker, who has control of or has hijacked an exposed printer (through UPD or mDNS), could send a harmful IPP attribute and potentially insert malicious commands into the PPD file.

RHCOS and RHEL include libs-cups as a build-time dependency. However, the vulnerability is not exploitable with just the client libraries unless a print server based on OpenPrinting is actively running.

RHEL and RHCOS does not have cups-browsed enabled by default so the impact for those are set to 'Low'

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

See the security bulletin for a detailed mitigation procedure.