On Thursday, September 26, 2024, a security researcher publicly disclosed several vulnerabilities affecting different components of OpenPrinting’s CUPS (Common Unix Printing System). CUPS is a popular IPP-based open-source printing system primarily (but not only) for Linux and UNIX-like operating systems. According to the researcher, a successful exploit chain allows remote unauthenticated attackers to replace existing printers’ IPP URLs with malicious URLs, resulting in arbitrary command execution when a print job is started from the target device.
The vulnerabilities disclosed by the researcher are:
CVE-2024-47176: Affects cups-browsed <= 2.0.1. The service binds on UDP *:631, trusting any packet from any source to trigger a Get-Printer-Attributes IPP request to an attacker-controlled URL.
CVE-2024-47076: Affects libcupsfilters <= 2.1b1. cfGetPrinterAttributes5 does not validate or sanitize the IPP attributes returned from an IPP server, providing attacker-controlled data to the rest of the CUPS system.
CVE-2024-47175: Affects libppd <= 2.1b1. The ppdCreatePPDFromIPP2 API does not validate or sanitize the IPP attributes when writing them to a temporary PPD file, allowing the injection of attacker-controlled data in the resulting PPD.
CVE-2024-47177: Affects cups-filters <= 2.0.1. The foomatic-rip filter allows arbitrary command execution via the FoomaticRIPCommandLine PPD parameter.
According to the researcher’s disclosure blog, affected systems are exploitable from the public internet, or across network segments, if UDP port 631 is exposed and the vulnerable service is listening. CUPS is enabled by default on most popular Linux distributions, but exploitability may vary across implementations. As of 6 PM ET on Thursday, September 26, Red Hat has an advisory available noting that they consider this group of vulnerabilities of Important severity rather than Critical.
Mitigation guidance
We exp ..
Support the originator by clicking the read the rest link below.
){kind=link}