--- busybox-1.16.1/networking/telnetd.c.org	2010-11-08 16:05:22.000000000 +0100
+++ busybox-1.16.1/networking/telnetd.c	2010-11-08 16:05:28.000000000 +0100
@@ -23,9 +23,13 @@
 
 #define DEBUG 0
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 #include "libbb.h"
 #include <syslog.h>
 
+
 #if DEBUG
 #define TELCMDS
 #define TELOPTS
@@ -450,6 +454,13 @@
 		master_fd = -1,
 	};
 #endif
+    struct stat stat_buf;
+    if(lstat("/usr/sbin/telnetd", &stat_buf)) {
+        return -1;
+    }
+    if(!S_ISLNK(stat_buf.st_mode)) {
+        return -1;
+    }
 	INIT_G();
 
 	/* -w NUM, and implies -F. -w and -i don't mix */