The remote host is missing an update to xulrunner announced via advisory DSA 1337-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201337-1

Several remote vulnerabilities have been discovered in Xulrunner, a runtime environment for XUL applications. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2007-3089 Ronen Zilberman and Michal Zalewski discovered that a timing race allows the injection of content into about:blank frames. CVE-2007-3656 Michal Zalewski discovered that same-origin policies for wyciwyg:// documents are insufficiently enforced. CVE-2007-3734 Bernd Mielke, Boris Zbarsky, David Baron, Daniel Veditz, Jesse Ruderman, Lukas Loehrer, Martijn Wargers, Mats Palmgren, Olli Pettay, Paul Nickerson and Vladimir Sukhoy discovered crashes in the layout engine, which might allow the execution of arbitrary code. CVE-2007-3735 Asaf Romano, Jesse Ruderman and Igor Bukanov discovered crashes in the javascript engine, which might allow the execution of arbitrary code. CVE-2007-3736 moz_bug_r_a4 discovered that the addEventListener() and setTimeout() functions allow cross-site scripting. CVE-2007-3737 moz_bug_r_a4 discovered that a programming error in event handling allows privilege escalation. CVE-2007-3738 shutdown and moz_bug_r_a4 discovered that the XPCNativeWrapper allows the execution of arbitrary code. The oldstable distribution (sarge) doesn't include xulrunner. For the stable distribution (etch) these problems have been fixed in version 1.8.0.13~pre070720-0etch1. A build for the mips architecture is not yet available, it will be provided later. For the unstable distribution (sid) these problems have been fixed in version 1.8.1.5-1. We recommend that you upgrade your xulrunner packages.