RHSA-2008:0134: Moderate: tcltk security update

Tcl is a scripting language designed for embedding into other applicationsand for use with Tk, a widget set.An input validation flaw was discovered in Tk's GIF image handling. Acode-size value read from a GIF image was not properly validated beforebeing used, leading to a buffer overflow. A specially crafted GIF filecould use this to cause a crash or, potentially, execute code with theprivileges of the application using the Tk graphical toolkit.(CVE-2008-0553)A buffer overflow flaw was discovered in Tk's animated GIF image handling.An animated GIF containing an initial image smaller than subsequent imagescould cause a crash or, potentially, execute code with the privileges ofthe application using the Tk library. (CVE-2007-5378)A flaw in the Tcl regular expression handling engine was discovered by WillDrewry. This flaw, first discovered in the Tcl regular expression engineused in the PostgreSQL database server, resulted in an infinite loop whenprocessing certain regular expressions. (CVE-2007-4772)All users are advised to upgrade to these updated packages which containbackported patches which resolve these issues.