CVE-2025-26465 (GCVE-0-2025-26465)
Vulnerability from cvelistv5
Published
2025-02-18 18:27
Modified
2025-08-14 13:06
Severity ?
6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-390 - Detection of Error Condition Without Action
Summary
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.
References
secalert@redhat.com https://access.redhat.com/errata/RHSA-2025:3837
secalert@redhat.com https://access.redhat.com/errata/RHSA-2025:6993
secalert@redhat.com https://access.redhat.com/errata/RHSA-2025:8385
secalert@redhat.com https://access.redhat.com/security/cve/CVE-2025-26465 Third Party Advisory
secalert@redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2344780 Issue Tracking, Third Party Advisory
secalert@redhat.com https://seclists.org/oss-sec/2025/q1/144 Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://bugzilla.suse.com/show_bug.cgi?id=1237040 Issue Tracking
af854a3a-2127-422b-91ae-364da2661108 https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig Patch
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security-tracker.debian.org/tracker/CVE-2025-26465 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security.netapp.com/advisory/ntap-20250228-0003/ Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://ubuntu.com/security/CVE-2025-26465 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.openssh.com/releasenotes.html#9.9p2 Release Notes
af854a3a-2127-422b-91ae-364da2661108 https://www.openwall.com/lists/oss-security/2025/02/18/1 Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.openwall.com/lists/oss-security/2025/02/18/4 Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/ Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108 https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh Mitigation, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 https://seclists.org/oss-sec/2025/q1/144 Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
Version: 6.8p1   <
Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9   < *
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
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   Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9   < *
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:8.7p1-38.el9_4.5   < *
    cpe:/o:redhat:rhel_eus:9.4::baseos
    cpe:/a:redhat:rhel_eus:9.4::appstream
 Create a notification for this product.
   Red Hat Red Hat Discovery 1.14 Unaffected: sha256:f33991d766b618a128fb99fbe4f9b61c5004f7c6aa73b2b38e28d59e56c64d63   < *
    cpe:/a:redhat:discovery:1.14::el9
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
   Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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   Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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   Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
 Create a notification for this product.
   Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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