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: Jesse Ruderman discovered crashes in the layout engine, which might allow the execution of arbitrary code. Daniel Holbert, Jesse Ruderman, Olli Pettay and "toshi" discovered crashes in the layout engine, which might allow the execution of arbitrary code. Josh Soref, Jesse Ruderman and Martin Wargers discovered crashes in the layout engine, which might allow the execution of arbitrary code. Jesse Ruderman discovered a crash in the Javascript engine, which might allow the execution of arbitrary code. Carsten Book and "Taral" discovered crashes in the layout engine, which might allow the execution of arbitrary code. Jesse Ruderman discovered that the user interface for installing/ removing PCKS #11 securiy modules wasn't informative enough, which might allow social engineering attacks. It was discovered that incorrect pointer handling in the XUL parser could lead to the execution of arbitrary code. Juan Pablo Lopez Yacubian discovered that incorrent rendering of some Unicode font characters could lead to spoofing attacks on the location bar.