A security flaw was found in the way Google spellchecker of TinyMCE spellchecker plugin sanitized content of $lang and $str arguments from presence of control characters when checking for matches. A remote attacker could provide a specially-crafted string, to be checked by the TinyMCE spellchecker plugin that, when processed, could lead to arbitrary code execution with the privileges of the user running the TinyMCE spellchecker plugin.
Relevant upstream patch:
This issue affects the versions of the tinymce-spellchecker package, as shipped with Fedora release of 16, 17, 18, and Fedora EPEL 6. Please schedule an update.
This issue did NOT affect the versions of the moodle package, as shipped with Fedora release of 16, 17, 18, Fedora EPEL 6 (TinyMCE spellchecker plugin in them was already updated) or as shipped with Fedora EPEL 5 (TinyMCE spellchecker plugin does not contain Google SpellChecker part yet).
Created tinymce-spellchecker tracking bugs for this issue
Affects: fedora-all [bug 902727]
Affects: epel-6 [bug 902728]
tinymce-spellchecker-2.0.5-8.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.
tinymce-spellchecker-2.0.5-6.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.