Several remote vulnerabilities have been discovered in Xulrunner, a runtime environment for XUL applications, such as the Iceweasel web browser. The Common Vulnerabilities and Exposures project identifies the following problems: Martijn Wargers, Jesse Ruderman and Josh Soref discovered crashes in the layout engine, which might allow the execution of arbitrary code. Jesse Ruderman discovered crashes in the layout engine, which might allow the execution of arbitrary code. Gary Kwong, and Timothee Groleau discovered crashes in the Javascript engine, which might allow the execution of arbitrary code. Gary Kwong discovered crashes in the Javascript engine, which might allow the execution of arbitrary code. It was discovered that incorrect memory management in the DOM element handling may lead to the execution of arbitrary code. Georgi Guninski discovered a violation of the same-origin policy through RDFXMLDataSource and cross-domain redirects. As indicated in the Etch release notes, security support for the Mozilla products in the oldstable distribution needed to be stopped before the end of the regular Etch security maintenance life cycle. You are strongly encouraged to upgrade to stable or switch to a still supported browser.