6.8Orta

CVE-2025-26465Openssh: machine-in-the-middle attack if verifyhostkeydns is enabled

OpenSSH; Red Hat Red Hat Enterprise Linux 8; Red Hat Red Hat Enterprise Linux 9; Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Yayım: 2025-02-18 21:27 (1 yıl önce)

Açıklama

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.

Zayıflık türü (CWE): CWE-390

Veri: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Bilgiler kaynaktaki haliyle, İngilizce yayımlanır.

Etkilenen ürünler ve sürümler

Üretici	Ürün	Sürümler
debian	debian linux	11.0
discovery	1.14	—
enterprise linux	8	—
enterprise linux	9	—
netapp	active iq unified manager	—
netapp	ontap	9
openbsd	openssh	6.9 – ≤ 9.8
redhat	enterprise linux	9.0
redhat	openshift container platform	4.0
Red Hat	Red Hat Discovery 1.14	all versions
Red Hat	Red Hat Enterprise Linux 10	—
Red Hat	Red Hat Enterprise Linux 6	—
Red Hat	Red Hat Enterprise Linux 7	—
Red Hat	Red Hat Enterprise Linux 8	all versions
Red Hat	Red Hat Enterprise Linux 9	all versions
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	all versions
Red Hat	Red Hat OpenShift Container Platform 4	all versions
rhel eus	9.4	—
Siemens	SIDIS Secured SmartPlug	< V7.26.0310
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	V3.1.5
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	V3.1.5
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	V3.1.5
—	OpenSSH	6.8p1 – ≤ 9.9p1

Kaynaklar ve yamalar

RHSA-2025:16823 vendor-advisory
RHSA-2025:3837 vendor-advisory
RHSA-2025:6993 vendor-advisory
RHSA-2025:8385 vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-26465 vdb-entryThird Party Advisory
https://access.redhat.com/solutions/7109879
RHBZ#2344780 issue-trackingIssue TrackingThird Party Advisory
https://seclists.org/oss-sec/2025/q1/144 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2025/Feb/18
http://seclists.org/fulldisclosure/2025/May/7
http://seclists.org/fulldisclosure/2025/May/8
https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-i… Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1237040 Issue Tracking
https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig Patch
https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html Third Party Advisory
https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2025-26465 Third Party Advisory
https://security.netapp.com/advisory/ntap-20250228-0003/ Third Party Advisory
https://ubuntu.com/security/CVE-2025-26465 Third Party Advisory
https://www.openssh.com/releasenotes.html#9.9p2 Release Notes
https://www.openwall.com/lists/oss-security/2025/02/18/1 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2025/02/18/4 Mailing ListThird Party Advisory
https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/ Press/Media Coverage
https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh MitigationThird Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-585531.html

CPE eşleşmeleri (NVD) (10)

cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* ≥ 6.9 ≤ 9.8
cpe:2.3:a:openbsd:openssh:6.8:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

CVSS puanı

6.8Orta

Kaynak: redhat · CVSS 3.1

Saldırı yolu: Ağ
Karmaşıklık: Yüksek
Gereken yetki: Yok
Kullanıcı etkileşimi: Gerekir
Kapsam: Değişmez
Gizlilik: Yüksek
Bütünlük: Yüksek
Erişilebilirlik: Yok

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Tüm puanlar (3)

cna	CVSS 3.1	6.8Orta
secalert@redhat.com	CVSS 3.1	6.8Orta
nvd	CVSS 3.1	6.8Orta

EPSS (30 günde istismar olasılığı)

7.72%

tüm CVE'lerin %95'inden yüksek

CISA değerlendirmesi (SSVC)

İstismar: poc
Otomatikleştirilebilir: no
Teknik etki: total

Zaman çizelgesi

Numara ayrıldı2025-02-10
Yayımlandı2025-02-18 21:27
IP-DB'ye ulaştı2026-10-25 00:00
Son güncelleme2026-11-05 19:17

Numarayı veren (CNA): redhat
NVD durumu: Modified

Kaynakta görüntüle: CVE.org · NVD

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