CVE-2024-47175
Description
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.
Security Bulletin
Statement
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'
Mitigation
See the security bulletin for a detailed mitigation procedure.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.7 | 9.8 | 8.6 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Changed |
| Confidentiality | High | High | None |
| Integrity Impact | High | High | High |
| Availability Impact | Low | High | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If a malicious user injects a character (such as a semi-colon) that delimits the end of one command and the beginning of another, it may be possible to then insert an entirely new and unrelated command that was not intended to be executed. This gives an attacker a privilege or capability that they would not otherwise have.
Frequently Asked Questions
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