Security researcher regenrecht reported via TippingPoint's Zero Day Initiative an error in the way <option> elements are inserted into a XUL tree <optgroup>. In certain cases, the number of references to an <option> element is under-counted, so that when the element is deleted a live pointer to its old location is kept around and may later be used. An attacker could potentially use these conditions to run arbitrary code on a victim's computer.
This is now public: http://www.mozilla.org/security/announce/2010/mfsa2010-18.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 3 Via RHSA-2010:0333 https://rhn.redhat.com/errata/RHSA-2010-0333.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 4 Via RHSA-2010:0332 https://rhn.redhat.com/errata/RHSA-2010-0332.html
epiphany-extensions-2.26.1-11.fc11,yelp-2.26.0-12.fc11,google-gadgets-0.11.1-6.fc11,perl-Gtk2-MozEmbed-0.08-6.fc11.10,Miro-2.5.4-3.fc11,mozvoikko-0.9.7-0.12.rc1.fc11,kazehakase-0.5.8-5.fc11.1,gnome-python2-extras-2.25.3-12.fc11,galeon-2.0.7-22.fc11,hulahop-0.4.9-13.fc11,gnome-web-photo-0.7-11.fc11,evolution-rss-0.1.4-11.fc11,chmsee-1.0.1-16.fc11,blam-1.8.5-19.fc11,epiphany-2.26.3-9.fc11,pcmanx-gtk2-0.3.9-4.20100222svn.fc11,firefox-3.5.9-1.fc11,xulrunner-1.9.1.9-1.fc11 has been submitted as an update for Fedora 11. http://admin.fedoraproject.org/updates/epiphany-extensions-2.26.1-11.fc11,yelp-2.26.0-12.fc11,google-gadgets-0.11.1-6.fc11,perl-Gtk2-MozEmbed-0.08-6.fc11.10,Miro-2.5.4-3.fc11,mozvoikko-0.9.7-0.12.rc1.fc11,kazehakase-0.5.8-5.fc11.1,gnome-python2-extras-2.25.3-12.fc11,galeon-2.0.7-22.fc11,hulahop-0.4.9-13.fc11,gnome-web-photo-0.7-11.fc11,evolution-rss-0.1.4-11.fc11,chmsee-1.0.1-16.fc11,blam-1.8.5-19.fc11,epiphany-2.26.3-9.fc11,pcmanx-gtk2-0.3.9-4.20100222svn.fc11,firefox-3.5.9-1.fc11,xulrunner-1.9.1.9-1.fc11
Miro-2.5.4-3.fc12,galeon-2.0.7-22.fc12,gnome-python2-extras-2.25.3-17.fc12,perl-Gtk2-MozEmbed-0.08-6.fc12.12,gnome-web-photo-0.9-6.fc12,mozvoikko-1.0-9.fc12,firefox-3.5.9-1.fc12,xulrunner-1.9.1.9-1.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/Miro-2.5.4-3.fc12,galeon-2.0.7-22.fc12,gnome-python2-extras-2.25.3-17.fc12,perl-Gtk2-MozEmbed-0.08-6.fc12.12,gnome-web-photo-0.9-6.fc12,mozvoikko-1.0-9.fc12,firefox-3.5.9-1.fc12,xulrunner-1.9.1.9-1.fc12
thunderbird-3.0.4-1.fc11,sunbird-1.0-0.16.20090715hg.fc11 has been submitted as an update for Fedora 11. http://admin.fedoraproject.org/updates/thunderbird-3.0.4-1.fc11,sunbird-1.0-0.16.20090715hg.fc11
thunderbird-3.0.4-1.fc13,sunbird-1.0-0.21.20090916hg.fc13 has been submitted as an update for Fedora 13. http://admin.fedoraproject.org/updates/thunderbird-3.0.4-1.fc13,sunbird-1.0-0.21.20090916hg.fc13
thunderbird-3.0.4-1.fc12,sunbird-1.0-0.21.20090916hg.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/thunderbird-3.0.4-1.fc12,sunbird-1.0-0.21.20090916hg.fc12
Miro-2.5.4-3.fc12, galeon-2.0.7-22.fc12, gnome-python2-extras-2.25.3-17.fc12, perl-Gtk2-MozEmbed-0.08-6.fc12.12, gnome-web-photo-0.9-6.fc12, mozvoikko-1.0-9.fc12, firefox-3.5.9-1.fc12, xulrunner-1.9.1.9-1.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
epiphany-extensions-2.26.1-11.fc11, yelp-2.26.0-12.fc11, google-gadgets-0.11.1-6.fc11, perl-Gtk2-MozEmbed-0.08-6.fc11.10, Miro-2.5.4-3.fc11, mozvoikko-0.9.7-0.12.rc1.fc11, kazehakase-0.5.8-5.fc11.1, gnome-python2-extras-2.25.3-12.fc11, galeon-2.0.7-22.fc11, hulahop-0.4.9-13.fc11, gnome-web-photo-0.7-11.fc11, evolution-rss-0.1.4-11.fc11, chmsee-1.0.1-16.fc11, blam-1.8.5-19.fc11, epiphany-2.26.3-9.fc11, pcmanx-gtk2-0.3.9-4.20100222svn.fc11, firefox-3.5.9-1.fc11, xulrunner-1.9.1.9-1.fc11 has been pushed to the Fedora 11 stable repository. If problems still persist, please make note of it in this bug report.
thunderbird-3.0.4-1.fc11, sunbird-1.0-0.16.20090715hg.fc11 has been pushed to the Fedora 11 stable repository. If problems still persist, please make note of it in this bug report.
thunderbird-3.0.4-1.fc12, sunbird-1.0-0.21.20090916hg.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
thunderbird-3.0.4-1.fc13, sunbird-1.0-0.21.20090916hg.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.
seamonkey-2.0.4-1.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/seamonkey-2.0.4-1.fc12
seamonkey-2.0.4-1.fc13 has been submitted as an update for Fedora 13. http://admin.fedoraproject.org/updates/seamonkey-2.0.4-1.fc13
seamonkey-2.0.4-1.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
seamonkey-2.0.4-1.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2010:0545 https://rhn.redhat.com/errata/RHSA-2010-0545.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Via RHSA-2010:0544 https://rhn.redhat.com/errata/RHSA-2010-0544.html