From de2422affbe24262496f477edeb1c04017907eb4 Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Fri, 16 May 2014 13:00:45 +0100 Subject: [PATCH] Fix CVE-2014-0221 Unnecessary recursion when receiving a DTLS hello request can be used to crash a DTLS client. Fixed by handling DTLS hello request without recursion. Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue. --- ssl/d1_both.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/ssl/d1_both.c b/ssl/d1_both.c index 3426a0a5f3..61867b3e33 100644 --- a/ssl/d1_both.c +++ b/ssl/d1_both.c @@ -787,6 +787,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) int i,al; struct hm_header_st msg_hdr; + redo: /* see if we have the required fragment already */ if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok) { @@ -845,8 +846,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok) s->msg_callback_arg); s->init_num = 0; - return dtls1_get_message_fragment(s, st1, stn, - max, ok); + goto redo; } else /* Incorrectly formated Hello request */ { -- 2.25.1