Date: Wed, 19 Feb 2025 14:54:34 GMT From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 34798cb576bb - stable/14 - ssh: Don't reply to PING in preauth phase or during KEX Message-ID: <202502191454.51JEsYDT013127@gitrepo.freebsd.org>
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The branch stable/14 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=34798cb576bbd2064ab8da372112482bf8e2a7e6 commit 34798cb576bbd2064ab8da372112482bf8e2a7e6 Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2025-02-19 03:00:45 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2025-02-19 14:42:35 +0000 ssh: Don't reply to PING in preauth phase or during KEX Obtained from: OpenSSH 5e07dee272c3 Security: CVE-2025-26466 Approved by: so Sponsored by: The FreeBSD Foundation (cherry picked from commit 8a16d0831e70530b2fbd682e748bd051de35f192) --- crypto/openssh/packet.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/crypto/openssh/packet.c b/crypto/openssh/packet.c index 2d1401e7c9f5..d8fbfa28b800 100644 --- a/crypto/openssh/packet.c +++ b/crypto/openssh/packet.c @@ -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)
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