Adobe security bulletin APSB13-08 describes a permissions issue with the Adobe Flash Player Firefox sandbox: This update resolves a permissions issue with the Flash Player Firefox sandbox (CVE-2013-0643). External References: http://www.adobe.com/support/security/bulletins/apsb13-08.html
This issue has been addressed in following products: Supplementary for Red Hat Enterprise Linux 5 Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2013:0574 https://rhn.redhat.com/errata/RHSA-2013-0574.html