Insufficient escaping of the LaTeX preamble made it possible for site administrators to read files available to the HTTP server system account.
| Severity/Risk: | Serious |
| Versions affected: | 3.11 to 3.11.2, 3.10 to 3.10.6, 3.9 to 3.9.9 and earlier unsupported versions |
| Versions fixed: | 3.11.3, 3.10.7 and 3.9.10 |
| Reported by: | raisin_bugbounty |
| Workaround: | Hard-code the value of the LaTeX preamble into $CFG->forced_plugin_settings['filter_tex']['latexpreamble'] within the site's config.php file. |
| CVE identifier: | CVE-2021-40694 |
| Changes (master): | http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-71240 |
| Tracker issue: | MDL-71240 Arbitrary file read by site administrators via LaTeX preamble |
Read more https://moodle.org/mod/forum/discuss.php?d=427106&parent=1719328