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[scarthgap] openssh: Fix CVE-2025-26466

Message ID 20250304040658.36572-1-vanusuri@mvista.com
State Accepted
Delegated to: Steve Sakoman
Headers show
Series [scarthgap] openssh: Fix CVE-2025-26466 | expand

Commit Message

Vijay Anusuri March 4, 2025, 4:06 a.m. UTC 
From: Vijay Anusuri <vanusuri@mvista.com>

sshd(8) in OpenSSH versions 9.5p1 to 9.9p1
  (inclusive) is vulnerable to a memory/CPU denial-of-service related
  to the handling of SSH2_MSG_PING packets. This condition may be
  mitigated using the existing PerSourcePenalties feature.

Upstream-Status: Backport [https://github.com/openssh/openssh-portable/commit/6ce00f0c2ecbb9f75023dbe627ee6460bcec78c2]

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
 .../openssh/openssh/CVE-2025-26466.patch      | 38 +++++++++++++++++++
 .../openssh/openssh_9.6p1.bb                  |  1 +
 2 files changed, 39 insertions(+)
 create mode 100644 meta/recipes-connectivity/openssh/openssh/CVE-2025-26466.patch
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Patch

diff --git a/meta/recipes-connectivity/openssh/openssh/CVE-2025-26466.patch b/meta/recipes-connectivity/openssh/openssh/CVE-2025-26466.patch
new file mode 100644
index 0000000000..27b2fa7143
--- /dev/null
+++ b/meta/recipes-connectivity/openssh/openssh/CVE-2025-26466.patch
@@ -0,0 +1,38 @@ 
+From 6ce00f0c2ecbb9f75023dbe627ee6460bcec78c2 Mon Sep 17 00:00:00 2001
+From: "djm@openbsd.org" <djm@openbsd.org>
+Date: Tue, 18 Feb 2025 08:02:12 +0000
+Subject: [PATCH] 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
+
+Upstream-Status: Backport [https://github.com/openssh/openssh-portable/commit/6ce00f0c2ecbb9f75023dbe627ee6460bcec78c2]
+CVE: CVE-2025-26466
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ packet.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/packet.c b/packet.c
+index beb214f..aeab98c 100644
+--- a/packet.c
++++ b/packet.c
+@@ -1773,6 +1773,14 @@ 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)
+-- 
+2.25.1
+
diff --git a/meta/recipes-connectivity/openssh/openssh_9.6p1.bb b/meta/recipes-connectivity/openssh/openssh_9.6p1.bb
index a8ba67e360..ea5face097 100644
--- a/meta/recipes-connectivity/openssh/openssh_9.6p1.bb
+++ b/meta/recipes-connectivity/openssh/openssh_9.6p1.bb
@@ -29,6 +29,7 @@  SRC_URI = "http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PV}.tar
            file://CVE-2024-6387.patch \
            file://CVE-2024-39894.patch \
            file://0001-Fix-missing-header-for-systemd-notification.patch \
+           file://CVE-2025-26466.patch \
            "
 SRC_URI[sha256sum] = "910211c07255a8c5ad654391b40ee59800710dd8119dd5362de09385aa7a777c"