Add linpeas privilege escalation checks from: SupaPwn: Hacking Our Way into Lovable’s Office and Helping Secure Supabase

linPEAS/README.md

@@ -98,6 +98,10 @@ The goal of this script is to search for possible **Privilege Escalation Paths**
 
 This script doesn't have any dependency.
 
+### Recent privilege-escalation additions
+
+- Added detection for unsafe PostgreSQL event triggers and custom `postgres_fdw` hooks that temporarily grant SUPERUSER privileges, surfacing SupaPwn-style escalation paths earlier.
+
 It uses **/bin/sh** syntax, so can run in anything supporting `sh` (and the binaries and parameters used).
 
 By default, **linpeas won't write anything to disk and won't try to login as any other user using `su`**.

linPEAS/builder/linpeas_parts/7_software_information/Postgresql_Event_Triggers.sh

@@ -0,0 +1,72 @@
+# Title: Software Information - PostgreSQL Event Triggers
+# ID: SI_Postgresql_Event_Triggers
+# Author: HT Bot
+# Last Update: 19-11-2025
+# Description: Detect unsafe PostgreSQL event triggers and postgres_fdw custom scripts that grant temporary SUPERUSER
+# License: GNU GPL
+# Version: 1.0
+# Functions Used: echo_not_found, print_2title, print_info
+# Global Variables: $DEBUG, $E, $SED_GREEN, $SED_RED, $SED_YELLOW, $TIMEOUT
+# Initial Functions:
+# Generated Global Variables: $psql_bin, $psql_evt_output, $psql_evt_status, $psql_evt_err_line, $postgres_fdw_dirs, $postgres_fdw_hits, $old_ifs, $evtname, $enabled, $owner, $owner_is_super, $func, $func_owner, $func_owner_is_super, $IFS
+# Fat linpeas: 0
+# Small linpeas: 1
+
+
+if [ "$DEBUG" ] || { [ "$TIMEOUT" ] && [ "$(command -v psql 2>/dev/null || echo -n '')" ]; }; then
+  print_2title "PostgreSQL event trigger ownership & postgres_fdw hooks"
+  print_info "https://book.hacktricks.wiki/en/linux-hardening/privilege-escalation/index.html#postgresql-event-triggers"
+
+  psql_bin="$(command -v psql 2>/dev/null || echo -n '')"
+  if [ "$TIMEOUT" ] && [ "$psql_bin" ]; then
+    psql_evt_output="$($TIMEOUT 5 "$psql_bin" -w -X -q -A -t -d postgres -c "WITH evt AS ( SELECT e.evtname, e.evtenabled, pg_get_userbyid(e.evtowner) AS trig_owner, tr.rolsuper AS trig_owner_super, n.nspname || '.' || p.proname AS function_name, pg_get_userbyid(p.proowner) AS func_owner, fr.rolsuper AS func_owner_super FROM pg_event_trigger e JOIN pg_proc p ON e.evtfoid = p.oid JOIN pg_namespace n ON p.pronamespace = n.oid LEFT JOIN pg_roles tr ON tr.oid = e.evtowner LEFT JOIN pg_roles fr ON fr.oid = p.proowner ) SELECT evtname || '|' || evtenabled || '|' || COALESCE(trig_owner,'?') || '|' || COALESCE(CASE WHEN trig_owner_super THEN 'yes' ELSE 'no' END,'unknown') || '|' || function_name || '|' || COALESCE(func_owner,'?') || '|' || COALESCE(CASE WHEN func_owner_super THEN 'yes' ELSE 'no' END,'unknown') FROM evt WHERE COALESCE(trig_owner_super,false) = false OR COALESCE(func_owner_super,false) = false;" 2>&1)"
+    psql_evt_status=$?
+    if [ $psql_evt_status -eq 0 ]; then
+      if [ "$psql_evt_output" ]; then
+        echo "Non-superuser-owned event triggers were found (trigger|enabled?|owner|owner_is_super|function|function_owner|fn_owner_is_super):" | sed -${E} "s,.*,${SED_RED},"
+        printf "%s\n" "$psql_evt_output" | while IFS='|' read evtname enabled owner owner_is_super func func_owner func_owner_is_super; do
+          case "$enabled" in
+            O) enabled="enabled" ;;
+            D) enabled="disabled" ;;
+            *) enabled="status_$enabled" ;;
+          esac
+          echo "  - $evtname ($enabled) uses $func owned by $func_owner (superuser:$func_owner_is_super); trigger owner: $owner (superuser:$owner_is_super)" | sed -${E} "s,superuser:no,${SED_RED},g"
+        done
+      else
+        echo "No event triggers owned by non-superusers were returned." | sed -${E} "s,.*,${SED_GREEN},"
+      fi
+    else
+      psql_evt_err_line=$(printf '%s\n' "$psql_evt_output" | head -n1)
+      echo "Could not query pg_event_trigger (psql exit $psql_evt_status): $psql_evt_err_line" | sed -${E} "s,.*,${SED_YELLOW},"
+    fi
+  else
+    if ! [ "$TIMEOUT" ]; then
+      echo_not_found "timeout"
+    fi
+    if ! [ "$psql_bin" ]; then
+      echo_not_found "psql"
+    fi
+  fi
+
+  postgres_fdw_dirs="/etc/postgresql /var/lib/postgresql /var/lib/postgres /usr/lib/postgresql /usr/local/lib/postgresql /opt/supabase /opt/postgres /srv/postgres"
+  postgres_fdw_hits=""
+  for d in $postgres_fdw_dirs; do
+    if [ -d "$d" ]; then
+      old_ifs="$IFS"
+      IFS="\n"
+      for f in $(find "$d" -maxdepth 5 -type f \( -name '*postgres_fdw*.sql' -o -name '*postgres_fdw*.psql' -o -name 'after-create.sql' \) 2>/dev/null); do
+        if [ -f "$f" ] && grep -qiE "alter[[:space:]]+role[[:space:]]+postgres[[:space:]]+superuser" "$f" 2>/dev/null; then
+          postgres_fdw_hits="$postgres_fdw_hits\n$f"
+        fi
+      done
+      IFS="$old_ifs"
+    fi
+  done
+
+  if [ "$postgres_fdw_hits" ]; then
+    echo "Detected postgres_fdw custom scripts granting postgres SUPERUSER (check for SupaPwn-style window):" | sed -${E} "s,.*,${SED_RED},"
+    printf "%s\n" "$postgres_fdw_hits" | sed "s,^,  - ,"
+  fi
+fi
+
+echo ""