The Common UNIX Printing System provides a portable printing layer for UNIX operating systems. The CUPS "pdftops" filter converts Portable Document Format files to PostScript. An uninitialized pointer use flaw was discovered in the CUPS "pdftops" filter. An attacker could create a malicious PDF file that, when printed, would cause "pdftops" to crash or, potentially, execute arbitrary code as the "lp" user. Users of cups are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, the cupsd daemon will be restarted automatically.