Commit 410e444b authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
Browse files

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)
parent a91be108

ssl/d1_both.c

+9 −0
Original line number Diff line number Diff line
@@ -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.