The remote host is missing an update to xulrunner-1.9 announced via advisory USN-745-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: firefox 1.5.dfsg+1.5.0.15~prepatch080614l-0ubuntu1 Ubuntu 7.10: firefox 2.0.0.21~tb.21.308+nobinonly-0ubuntu0.7.10.1 Ubuntu 8.04 LTS: firefox-3.0 3.0.8+nobinonly-0ubuntu0.8.04.2 xulrunner-1.9 1.9.0.8+nobinonly-0ubuntu0.8.04.1 Ubuntu 8.10: abrowser 3.0.8+nobinonly-0ubuntu0.8.10.2 firefox-3.0 3.0.8+nobinonly-0ubuntu0.8.10.2 xulrunner-1.9 1.9.0.8+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-745-1

It was discovered that Firefox did not properly perform XUL garbage collection. If a user were tricked into viewing a malicious website, a remote attacker could cause a denial of service or execute arbitrary code with the privileges of the user invoking the program. This issue only affected Ubuntu 8.04 LTS and 8.10. (CVE-2009-1044) A flaw was discovered in the way Firefox performed XSLT transformations. If a user were tricked into opening a crafted XSL stylesheet, an attacker could cause a denial of service or execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-1169)