[openssh-commits] [openssh] 01/03: upstream: Don't reply to PING in preauth phase or during KEX

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djm pushed a commit to branch master
in repository openssh.

commit 6ce00f0c2ecbb9f75023dbe627ee6460bcec78c2
Author: djm at openbsd.org <djm at openbsd.org>
AuthorDate: Tue Feb 18 08:02:12 2025 +0000

    upstream: Don't reply to PING in preauth phase or during KEX
    
    Reported by the Qualys Security Advisory team. ok markus@
    
    OpenBSD-Commit-ID: c656ac4abd1504389d1733d85152044b15830217
---
 packet.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/packet.c b/packet.c
index 486f8515..9dea2cfc 100644
--- a/packet.c
+++ b/packet.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.c,v 1.317 2024/08/23 04:51:00 deraadt Exp $ */
+/* $OpenBSD: packet.c,v 1.318 2025/02/18 08:02:12 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo at cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo at cs.hut.fi>, Espoo, Finland
@@ -1864,6 +1864,14 @@ ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
 			if ((r = sshpkt_get_string_direct(ssh, &d, &len)) != 0)
 				return r;
 			DBG(debug("Received SSH2_MSG_PING len %zu", len));
+			if (!ssh->state->after_authentication) {
+				DBG(debug("Won't reply to PING in preauth"));
+				break;
+			}
+			if (ssh_packet_is_rekeying(ssh)) {
+				DBG(debug("Won't reply to PING during KEX"));
+				break;
+			}
 			if ((r = sshpkt_start(ssh, SSH2_MSG_PONG)) != 0 ||
 			    (r = sshpkt_put_string(ssh, d, len)) != 0 ||
 			    (r = sshpkt_send(ssh)) != 0)

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