The remote host is missing an update to xulrunner-1.9 announced via advisory USN-728-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.04 LTS: firefox-3.0 3.0.7+nobinonly-0ubuntu0.8.04.1 xulrunner-1.9 1.9.0.7+nobinonly-0ubuntu0.8.04.1 Ubuntu 8.10: abrowser 3.0.7+nobinonly-0ubuntu0.8.10.1 firefox-3.0 3.0.7+nobinonly-0ubuntu0.8.10.1 xulrunner-1.9 1.9.0.7+nobinonly-0ubuntu0.8.10.1 After a standard system upgrade you need to restart Firefox and any applications that use xulrunner, such as Epiphany, to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-728-1

Glenn Randers-Pehrson discovered that the embedded libpng in Firefox did not properly initialize pointers. If a user were tricked into viewing a malicious website with a crafted PNG file, a remote attacker could cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0040) Martijn Wargers, Jesse Ruderman, Josh Soref, Gary Kwong, and Timothee Groleau discovered flaws in the browser engine. If a user were tricked into viewing a malicious website, a remote attacker could cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0771, CVE-2009-0772, CVE-2009-0773, CVE-2009-0774) A flaw was discovered in Firefox's garbage collection process. Under certain circumstances a remote attacker could exploit this to cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0775) Georgi Guninski discovered a flaw when Firefox performed a cross-domain redirect. An attacker could bypass the same-origin policy in Firefox by utilizing nsIRDFService and steal private data from users authenticated to the redirected website. (CVE-2009-0776) Masahiro Yamada discovered that Firefox did not display control characters in the location bar. An attacker could exploit this to spoof the location bar, such as in a phishing attack. (CVE-2009-0777)