Several remote vulnerabilities have been discovered in Xulrunner, a runtime environment for XUL applications. The Common Vulnerabilities and Exposures project identifies the following problems: Wladimir Palant discovered that security checks in XML processing were insufficiently enforced. Chris Evans discovered that insecure CSS handling could lead to reading data across domain boundaries. Aki Helin discovered a buffer overflow in the internal copy of libpng, which could lead to the execution of arbitrary code. "regenrecht" discovered that incorrect memory handling in DOM parsing could lead to the execution of arbitrary code. Jesse Ruderman, Ehsan Akhgari, Mats Palmgren, Igor Bukanov, Gary Kwong, Tobias Markus and Daniel Holbert discovered crashes in the layout engine, which might allow the execution of arbitrary code. "JS3" discovered an integer overflow in the plugin code, which could lead to the execution of arbitrary code. Jordi Chancel discovered that the location could be spoofed to appear like a secured page. "regenrecht" discovered that incorrect memory handling in XUL parsing could lead to the execution of arbitrary code. Soroush Dalili discovered an information leak in script processing.