From: Florian Weimer <fw@deneb.enyo.de>
To: linux-kernel@vger.kernel.org
Subject: [SECURITY] CERT/CC VU#464113, SYN plus RST/FIN
Date: Fri, 25 Oct 2002 11:00:43 +0200 [thread overview]
Message-ID: <87vg3qq4ec.fsf@deneb.enyo.de> (raw)
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)
next reply other threads:[~2002-10-25 8:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-25 9:00 Florian Weimer [this message]
2002-10-25 10:13 ` [SECURITY] CERT/CC VU#464113, SYN plus RST/FIN Alex Riesen
2002-10-25 10:16 ` Florian Weimer
2002-10-25 10:33 ` Alex Riesen
2002-10-25 10:25 ` Alan Cox
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