Messages in this thread Patch in this message | | | Subject | [SECURITY] CERT/CC VU#464113, SYN plus RST/FIN | From | Florian Weimer <> | Date | Fri, 25 Oct 2002 11:00:43 +0200 |
| |
This patch prevents SYN+RST and SYN+FIN segments which arrive in the LISTEN state from initiating a three-way handshake.
I'm not sure if it is correct, but it's better than nothing (so far, I haven't seen any patch for this issue).
--- tcp_input.c 2002/10/25 08:45:20 1.1 +++ tcp_input.c 2002/10/25 08:49:21 @@ -3668,6 +3668,8 @@ case TCP_LISTEN: if(th->ack) return 1; + if(th->rst || th->fin) + goto discard; if(th->syn) { if(tp->af_specific->conn_request(sk, skb) < 0) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |