The remote host is missing an update to xulrunner-1.9 announced via advisory USN-821-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 8.04 LTS: firefox-3.0 3.0.14+build2+nobinonly-0ubuntu0.8.04.1 xulrunner-1.9 1.9.0.14+build2+nobinonly-0ubuntu0.8.04.1 Ubuntu 8.10: abrowser 3.0.14+build2+nobinonly-0ubuntu0.8.10.1 firefox-3.0 3.0.14+build2+nobinonly-0ubuntu0.8.10.1 xulrunner-1.9 1.9.0.14+build2+nobinonly-0ubuntu0.8.10.1 Ubuntu 9.04: abrowser 3.0.14+build2+nobinonly-0ubuntu0.9.04.1 firefox-3.0 3.0.14+build2+nobinonly-0ubuntu0.9.04.1 xulrunner-1.9 1.9.0.14+build2+nobinonly-0ubuntu0.9.04.1 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-821-1

Several flaws were discovered in the Firefox browser and JavaScript engines. 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-2009-3070, CVE-2009-3071, CVE-2009-3072, CVE-2009-3074, CVE-2009-3075) Jesse Ruderman and Dan Kaminsky discovered that Firefox did not adequately inform users when security modules were added or removed via PKCS11. If a user visited a malicious website, an attacker could exploit this to trick the user into installing a malicious PKCS11 module. (CVE-2009-3076) It was discovered that Firefox did not properly manage memory when using XUL tree elements. 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-2009-3077) Juan Pablo Lopez Yacubian discovered that Firefox did properly display certain Unicode characters in the location bar and other text fields when using a certain non-Ubuntu font. If a user configured Firefox to use this font, an attacker could exploit this to spoof the location bar, such as in a phishing attack. (CVE-2009-3078) It was discovered that the BrowserFeedWriter in Firefox could be subverted to run JavaScript code from web content with elevated chrome privileges. If a user were tricked into viewing a malicious website, an attacker could exploit this to execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-3079)