Fix for CVE-2014-0195

A buffer overrun attack can be triggered by sending invalid DTLS fragments
to an OpenSSL DTLS client or server. This is potentially exploitable to
run arbitrary code on a vulnerable client or server.

Fixed by adding consistency check for DTLS fragments.

Thanks to Jüri Aedla for reporting this issue.
(cherry picked from commit 1632ef744872edc2aa2a53d487d3e79c965a4ad3)

diff --git a/ssl/d1_both.c b/ssl/d1_both.c
index 820c8f08fa90365faf89e29964c1846ce2cbbee1..228af21462c1812cbe84ed023a5caa181e3dd46a 100644 (file)
--- a/ssl/d1_both.c
+++ b/ssl/d1_both.c
@@ -632,7 +632,16 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
                frag->msg_header.frag_off = 0;
                }
        else
+               {
                frag = (hm_fragment*) item->data;
+               if (frag->msg_header.msg_len != msg_hdr->msg_len)
+                       {
+                       item = NULL;
+                       frag = NULL;
+                       goto err;
+                       }
+               }
+
 
        /* If message is already reassembled, this must be a
         * retransmit and can be dropped.