The KSES text cleaning filter in lib/weblib.php in Moodle before 1.8.13 and 1.9.x before 1.9.9 does not properly handle vbscript URIs, which allows remote authenticated users to conduct cross-site scripting (XSS) attacks via HTML input.

References

• https://nvd.nist.gov/vuln/detail/CVE-2010-2230
• https://bugzilla.redhat.com/show_bug.cgi?id=605809
• http://cvs.moodle.org/moodle/lib/weblib.php?r1=1.812.2.114&r2=1.812.2.115
• http://cvs.moodle.org/moodle/lib/weblib.php?r1=1.970.2.171&r2=1.970.2.172
• http://docs.moodle.org/en/Moodle_1.8.13_release_notes
• http://docs.moodle.org/en/Moodle_1.9.9_release_notes
• http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043285.html
• http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043291.html
• http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043340.html
• http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
• http://moodle.org/mod/forum/discuss.php?d=152368
• http://tracker.moodle.org/browse/MDL-22042
• http://www.openwall.com/lists/oss-security/2010/06/21/2
• http://www.vupen.com/english/advisories/2010/1530
• http://www.vupen.com/english/advisories/2010/1571
• moodle/moodle@704c5df
• https://web.archive.org/web/20100621005117/http://secunia.com/advisories/40248
• https://web.archive.org/web/20100711044720/http://secunia.com/advisories/40352