CVE-2014-5030

CUPS anterior a 2.0 permite a usuarios locales leer ficheros arbitrarios a través de un ataque de enlace simbólico sobre (1) index.html, (2) index.class, (3) index.pl, (4) index.php, (5) index.pyc o (6) index.py.

It was discovered that CUPS allowed certain users to create symbolic links in certain directories under /var/cache/cups/. A local user with the 'lp' group privileges could use this flaw to read the contents of arbitrary files on the system or, potentially, escalate their privileges on the system.

Cross-site scripting vulnerability in scheduler/client.c in Common Unix Printing System before 1.7.2 allows remote attackers to inject arbitrary web script or HTML via the URL path, related to the is_path_absolute function. In CUPS before 1.7.4, a local user with privileges of group=lp can write symbolic links in the rss directory and use that to gain '@SYSTEM' group privilege with cupsd. It was discovered that the web interface in CUPS incorrectly validated permissions on rss files and directory index files. A local attacker could possibly use this issue to bypass file permissions and read arbitrary files, possibly leading to a privilege escalation. A malformed file with an invalid page header and compressed raster data can trigger a buffer overflow in cupsRasterReadPixels.