CVE-2018-4180

En macOS High Sierra en versiones anteriores a la 10.13.5, existía un problema en CUPS. Este problema se abordó mediante la mejora de las restricciones de acceso.

It was discovered that CUPS allows non-root users to pass environment variables to CUPS backends. Affected backends use attacker-controlled environment variables without proper sanitization. A local attacker, who is part of one of the groups specified in the SystemGroups directive, could use the cupsctl binary to set SetEnv and PassEnv directives and potentially controls the flow of the affected backend, resulting in some cases in arbitrary code execution with root privileges.

It was discovered that CUPS incorrectly handled certain print jobs with invalid usernames. A remote attacker could possibly use this issue to cause CUPS to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 17.10 and Ubuntu 18.04 LTS. Dan Bastone discovered that the CUPS dnssd backend incorrectly handled certain environment variables. A local attacker could possibly use this issue to escalate privileges. Various other issues were also addressed.