The remote host is missing an update to xulrunner announced via advisory DSA 1392-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201392-1

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-2007-1095 Michal Zalewski discovered that the unload event handler had access to the address of the next page to be loaded, which could allow information disclosure or spoofing. CVE-2007-2292 Stefano Di Paola discovered that insufficient validation of user names used in Digest authentication on a web site allows HTTP response splitting attacks. CVE-2007-3511 It was discovered that insecure focus handling of the file upload control can lead to information disclosure. This is a variant of CVE-2006-2894. CVE-2007-5334 Eli Friedman discovered that web pages written in Xul markup can hide the titlebar of windows, which can lead to spoofing attacks. CVE-2007-5337 Georgi Guninski discovered the insecure handling of smb:// and sftp:// URI schemes may lead to information disclosure. This vulnerability is only exploitable if Gnome-VFS support is present on the system. CVE-2007-5338 moz_bug_r_a4 discovered that the protection scheme offered by XPCNativeWrappers could be bypassed, which might allow privilege escalation. CVE-2007-5339 L. David Baron, Boris Zbarsky, Georgi Guninski, Paul Nickerson, Olli Pettay, Jesse Ruderman, Vladimir Sukhoy, Daniel Veditz, and Martijn Wargers discovered crashes in the layout engine, which might allow the execution of arbitrary code. CVE-2007-5340 Igor Bukanov, Eli Friedman, and Jesse Ruderman discovered crashes in the Javascript engine, which might allow the execution of arbitrary code. The oldstable distribution (sarge) doesn't contain xulrunner. For the stable distribution (etch) these problems have been fixed in version 1.8.0.14~pre071019b-0etch1. Builds for hppa and mipsel will be provided later. The unstable distribution (sid) will be fixed soon. We recommend that you upgrade your xulrunner packages.