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.comhttps://access.redhat.com/errata/RHSA-2025:3837
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:6993
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:8385
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2025-26465Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2344780Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://seclists.org/oss-sec/2025/q1/144Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1237040Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sigPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/02/msg00020.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2025-26465Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20250228-0003/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/CVE-2025-26465Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openssh.com/releasenotes.html#9.9p2Release Notes
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2025/02/18/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2025/02/18/4Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/Press/Media Coverage
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-opensshThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-opensshMitigation, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://seclists.org/oss-sec/2025/q1/144Mailing 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
 Create a notification for this product.
   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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