From b139635512b1af75e82252c0c71ac66e08b78774 Mon Sep 17 00:00:00 2001 From: "markus@openbsd.org" Date: Mon, 10 Oct 2016 19:28:48 +0000 Subject: upstream commit Unregister the KEXINIT handler after message has been received. Otherwise an unauthenticated peer can repeat the KEXINIT and cause allocation of up to 128MB -- until the connection is closed. Reported by shilei-c at 360.cn Upstream-ID: 43649ae12a27ef94290db16d1a98294588b75c05 Origin: https://anongit.mindrot.org/openssh.git/commit/?id=ec165c392ca54317dbe3064a8c200de6531e89ad Bug-Debian: https://bugs.debian.org/841884 Bug-Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Last-Update: 2016-10-24 Patch-Name: unregister-kexinit.patch --- kex.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kex.c b/kex.c index c17d652c9..7ab72ba19 100644 --- a/kex.c +++ b/kex.c @@ -488,6 +488,7 @@ kex_input_kexinit(int type, u_int32_t seq, void *ctxt) if (kex == NULL) return SSH_ERR_INVALID_ARGUMENT; + ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, NULL); ptr = sshpkt_ptr(ssh, &dlen); if ((r = sshbuf_put(kex->peer, ptr, dlen)) != 0) return r; -- cgit v1.2.3