diff -Nru ppp-2.4.4.orig/pppd/chap_ms.c ppp-2.4.4/pppd/chap_ms.c
--- ppp-2.4.4.orig/pppd/chap_ms.c	2006-05-21 13:56:40.000000000 +0200
+++ ppp-2.4.4/pppd/chap_ms.c	2006-11-23 19:50:47.709231200 +0100
@@ -852,7 +852,7 @@
     u_char *p = &response[MS_CHAP2_PEER_CHALLENGE];
     int i;
 
-    BZERO(response, sizeof(*response));
+    BZERO(response, MS_CHAP2_RESPONSE_LEN);
 
     /* Generate the Peer-Challenge if requested, or copy it if supplied. */
     if (!PeerChallenge)