The remote host is missing an update to xulrunner announced via advisory DSA 1840-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201840-1

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: CVE-2009-2462 Martijn Wargers, Arno Renevier, Jesse Ruderman, Olli Pettay and Blake Kaplan disocvered several issues in the browser engine that could potentially lead to the execution of arbitrary code. (MFSA 2009-34) CVE-2009-2463 monarch2020 reported an integer overflow in a base64 decoding function. (MFSA 2009-34) CVE-2009-2464 Christophe Charron reported a possibly exploitable crash occuring when multiple RDF files were loaded in a XUL tree element. (MFSA 2009-34) CVE-2009-2465 Yongqian Li reported that an unsafe memory condition could be created by specially crafted document. (MFSA 2009-34) CVE-2009-2466 Peter Van der Beken, Mike Shaver, Jesse Ruderman, and Carsten Book discovered several issues in the JavaScript engine that could possibly lead to the execution of arbitrary JavaScript. (MFSA 2009-34) CVE-2009-2467 Attila Suszter discovered an issue related to a specially crafted Flash object, which could be used to run arbitrary code. (MFSA 2009-35) CVE-2009-2469 PenPal discovered that it is possible to execute arbitrary code via a specially crafted SVG element. (MFSA 2009-37) CVE-2009-2471 Blake Kaplan discovered a flaw in the JavaScript engine that might allow an attacker to execute arbitrary JavaScript with chrome privileges. (MFSA 2009-39) CVE-2009-2472 moz_bug_r_a4 discovered an issue in the JavaScript engine that could be used to perform cross-site scripting attacks. (MFSA 2009-40) For the stable distribution (lenny), these problems have been fixed in version 1.9.0.12-0lenny1. 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. For the testing distribution (squeeze), these problems will be fixed soon. For the unstable distribution (sid), these problems have been fixed in version 1.9.0.12-1. We recommend that you upgrade your xulrunner packages.