diff -Naur cyrus-sasl-2.1.18-orig/lib/common.c cyrus-sasl-2.1.18/lib/common.c
--- cyrus-sasl-2.1.18-orig/lib/common.c	2004-03-10 10:51:35.000000000 -0500
+++ cyrus-sasl-2.1.18/lib/common.c	2004-07-07 12:15:19.570798953 -0400
@@ -1794,9 +1794,11 @@
   if (! path)
     return SASL_BADPARAM;
 
-  *path = getenv(SASL_PATH_ENV_VAR);
-  if (! *path)
-    *path = PLUGINDIR;
+  if (getuid() == geteuid() && getgid() == getegid()) {
+    *path = getenv(SASL_PATH_ENV_VAR);
+    if (! *path)
+      *path = PLUGINDIR;
+  }
 
   return SASL_OK;
 }