The remote host is missing an update to xulrunner announced via advisory DSA 1704-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201704-1

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-2008-5500 Jesse Ruderman discovered that the layout engine is vulnerable to DoS attacks that might trigger memory corruption and an integer overflow. (MFSA 2008-60) CVE-2008-5503 Boris Zbarsky discovered that an information disclosure attack could be performed via XBL bindings. (MFSA 2008-61) CVE-2008-5506 Marius Schilder discovered that it is possible to obtain sensible data via a XMLHttpRequest. (MFSA 2008-64) CVE-2008-5507 Chris Evans discovered that it is possible to obtain sensible data via a JavaScript URL. (MFSA 2008-65) CVE-2008-5508 Chip Salzenberg discovered possible phishing attacks via URLs with leading whitespaces or control characters. (MFSA 2008-66) CVE-2008-5511 It was discovered that it is possible to perform cross-site scripting attacks via an XBL binding to an unloaded document. (MFSA 2008-68) CVE-2008-5512 It was discovered that it is possible to run arbitrary JavaScript with chrome privileges via unknown vectors. (MFSA 2008-68) For the stable distribution (etch) these problems have been fixed in version 1.8.0.15~pre080614i-0etch1. For the testing distribution (lenny) and the unstable distribution (sid) these problems have been fixed in version 1.9.0.5-1. We recommend that you upgrade your xulrunner packages.