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commit d30e582446b027868cdabd0994681643682045a4
Author: Dr. Stephen Henson <steve@openssl.org>
Date: Fri May 16 13:00:45 2014 +0100
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.
Patch borrowed from Fedora
Upstream-Status: Backport
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
diff --git a/ssl/d1_both.c b/ssl/d1_both.c
index 07f67f8..4c2fd03 100644
--- a/ssl/d1_both.c
+++ b/ssl/d1_both.c
@@ -793,6 +793,7 @@ 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)
{
@@ -851,8 +852,7 @@ 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 */
{
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