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ssh: Don't reply to PING in preauth phase or during KEX

Browse Source 
Obtained from:	OpenSSH 5e07dee272c3
Security:	CVE-2025-26466
Security:	FreeBSD-SA-25:05.openssh
Approved by:	so
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit 8a16d0831e70530b2fbd682e748bd051de35f192)
(cherry picked from commit 34798cb576bbd2064ab8da372112482bf8e2a7e6)
This commit is contained in:
Ed Maste 2025-02-18 22:00:45 -05:00 committed by Franco Fichtner
parent e33a9f9b08
commit b1697b649a
1 changed files with 9 additions and 1 deletions
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10
crypto/openssh/packet.c
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@ -1,4 +1,4 @@
/* $OpenBSD: packet.c,v 1.313 2023/12/18 14:45:17 djm Exp $ */
/* $OpenBSD: packet.c,v 1.318 2025/02/18 08:02:12 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1774,6 +1774,14 @@ 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)