GHSA-JRWV-MV4H-7RRQ

Vulnerability from github – Published: 2025-02-18 21:32 – Updated: 2025-02-19 15:32
VLAI?
Details

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.

Severity ?
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2025-26465"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-390"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-18T19:15:29Z",
    "severity": "MODERATE"
  },
  "details": "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\u0027s memory resource first, turning the attack complexity high.",
  "id": "GHSA-jrwv-mv4h-7rrq",
  "modified": "2025-02-19T15:32:12Z",
  "published": "2025-02-18T21:32:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26465"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2025-26465"
    },
    {
      "type": "WEB",
      "url": "https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2344780"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1237040"
    },
    {
      "type": "WEB",
      "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/oss-sec/2025/q1/144"
    },
    {
      "type": "WEB",
      "url": "https://security-tracker.debian.org/tracker/CVE-2025-26465"
    },
    {
      "type": "WEB",
      "url": "https://ubuntu.com/security/CVE-2025-26465"
    },
    {
      "type": "WEB",
      "url": "https://www.openssh.com/releasenotes.html#9.9p2"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2025/02/18/1"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2025/02/18/4"
    },
    {
      "type": "WEB",
      "url": "https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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