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Security researcher J23 reported via TippingPoint's Zero Day Initiative that an array class used to store CSS values contained an integer overflow vulnerability. The 16 bit integer value used in allocating the size of the array could overflow, resulting in too small a memory buffer being created. When the array was later populated with CSS values data would be written past the end of the buffer potentially resulting in the execution of attacker-controlled memory.
This is now public: http://www.mozilla.org/security/announce/2010/mfsa2010-39.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2010:0547 https://rhn.redhat.com/errata/RHSA-2010-0547.html
seamonkey-2.0.6-1.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.
xulrunner-1.9.2.7-1.fc13, firefox-3.6.7-1.fc13, mozvoikko-1.0-12.fc13, gnome-web-photo-0.9-10.fc13, perl-Gtk2-MozEmbed-0.08-6.fc13.15, gnome-python2-extras-2.25.3-20.fc13, galeon-2.0.7-30.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.
thunderbird-3.0.6-1.fc12, sunbird-1.0-0.23.20090916hg.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
seamonkey-2.0.6-1.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
xulrunner-1.9.1.11-1.fc12, firefox-3.5.11-1.fc12, gnome-web-photo-0.9-8.fc12, mozvoikko-1.0-11.fc12, perl-Gtk2-MozEmbed-0.08-6.fc12.14, gnome-python2-extras-2.25.3-19.fc12, galeon-2.0.7-24.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
thunderbird-3.1.1-1.fc13, sunbird-1.0-0.26.b2pre.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.