OESA-2025-2128 (CVE-2025-4877)

Vulnerability from osv_openeuler – Published: 2025-09-05 11:09 – Updated: 2026-08-06 11:09 – Source website
VLAI
Summary
libssh security update
Details

The ssh library was designed to be used by programmers needing a working SSH implementation by the mean of a library. The complete control of the client is made by the programmer. With libssh, you can remotely execute programs, transfer files, use a secure and transparent tunnel for your remote programs. With its Secure FTP implementation, you can play with remote files easily, without third-party programs others than libcrypto (from openssl).

Security Fix(es):

A vulnerability classified as critical was found in libssh up to 0.11.1.The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.As an impact it is known to affect confidentiality, integrity, and availability.Upgrading to version 0.11.2 eliminates this vulnerability.(CVE-2025-4877)

A vulnerability, which was classified as problematic, has been found in libssh up to 0.11.1.Using CWE to declare the problem leads to CWE-824. The product accesses or uses a pointer that has not been initialized.Impacted is confidentiality, integrity, and availability.Upgrading to version 0.11.2 eliminates this vulnerability.(CVE-2025-4878)

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.(CVE-2025-5372)

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libssh-0.9.4-11.oe2003sp4.aarch64.rpm",
          "libssh-debuginfo-0.9.4-11.oe2003sp4.aarch64.rpm",
          "libssh-debugsource-0.9.4-11.oe2003sp4.aarch64.rpm",
          "libssh-devel-0.9.4-11.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "libssh-help-0.9.4-11.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "libssh-0.9.4-11.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libssh-0.9.4-11.oe2003sp4.x86_64.rpm",
          "libssh-debuginfo-0.9.4-11.oe2003sp4.x86_64.rpm",
          "libssh-debugsource-0.9.4-11.oe2003sp4.x86_64.rpm",
          "libssh-devel-0.9.4-11.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "libssh",
        "purl": "pkg:rpm/openEuler/libssh\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.4-11.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The ssh library was designed to be used by programmers needing a working SSH implementation by the mean of a library. The complete control of the client is made by the programmer. With libssh, you can remotely execute programs, transfer files, use a secure and transparent tunnel for your remote programs. With its Secure FTP implementation, you can play with remote files easily, without third-party programs others than libcrypto (from openssl).\r\n\r\nSecurity Fix(es):\n\nA vulnerability classified as critical was found in libssh up to 0.11.1.The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.As an impact it is known to affect confidentiality, integrity, and availability.Upgrading to version 0.11.2 eliminates this vulnerability.(CVE-2025-4877)\n\nA vulnerability, which was classified as problematic, has been found in libssh up to 0.11.1.Using CWE to declare the problem leads to CWE-824. The product accesses or uses a pointer that has not been initialized.Impacted is confidentiality, integrity, and availability.Upgrading to version 0.11.2 eliminates this vulnerability.(CVE-2025-4878)\n\nA flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success\u2014the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions\u0026apos; confidentiality, integrity, and availability.(CVE-2025-5372)",
  "id": "OESA-2025-2128",
  "modified": "2026-08-06T11:09:13Z",
  "published": "2025-09-05T11:09:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2128"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-4877"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-4878"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5372"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libssh security update",
  "upstream": [
    "CVE-2025-4877",
    "CVE-2025-4878",
    "CVE-2025-5372"
  ]
}



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