UBUNTU-CVE-2025-13470 (CVE-2025-13470)

Vulnerability from osv_ubuntu – Published: 2025-11-21 17:15 – Updated: 2026-05-20 15:16 – Source website
VLAI
Details

In RNP version 0.18.0 a refactoring regression causes the symmetric session key used for Public-Key Encrypted Session Key (PKESK) packets to be left uninitialized except for zeroing, resulting in it always being an all-zero byte array. Any data encrypted using public-key encryption in this release can be decrypted trivially by supplying an all-zero session key, fully compromising confidentiality. The vulnerability affects only public key encryption (PKESK packets). Passphrase-based encryption (SKESK packets) is not affected. Root cause: Vulnerable session key buffer used in PKESK packet generation. The defect was introduced in commit 7bd9a8dc356aae756b40755be76d36205b6b161a where initialization logic inside encrypted_build_skesk() only randomized the key for the SKESK path and omitted it for the PKESK path.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:Y/RE:H/U:Red
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librnp0",
            "binary_version": "0.15.2-6build1"
          },
          {
            "binary_name": "rnp",
            "binary_version": "0.15.2-6build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "rnp",
        "purl": "pkg:deb/ubuntu/rnp@0.15.2-6build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.14.0-6",
        "0.15.2-6build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librnp0",
            "binary_version": "0.17.0-3"
          },
          {
            "binary_name": "rnp",
            "binary_version": "0.17.0-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rnp",
        "purl": "pkg:deb/ubuntu/rnp@0.17.0-3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17.0-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librnp0",
            "binary_version": "0.17.1-1"
          },
          {
            "binary_name": "rnp",
            "binary_version": "0.17.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rnp",
        "purl": "pkg:deb/ubuntu/rnp@0.17.1-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librnp0",
            "binary_version": "0.18.1-1build1"
          },
          {
            "binary_name": "rnp",
            "binary_version": "0.18.1-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rnp",
        "purl": "pkg:deb/ubuntu/rnp@0.18.1-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17.1-1",
        "0.18.0-4",
        "0.18.1-1",
        "0.18.1-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "In RNP version 0.18.0 a refactoring regression causes the symmetric session key used for Public-Key Encrypted Session Key (PKESK) packets to  be left uninitialized except for zeroing, resulting in it always being an all-zero byte array. Any data encrypted using public-key encryption in this release can be decrypted trivially by supplying an all-zero session key, fully compromising confidentiality. The vulnerability affects only public key encryption (PKESK packets). Passphrase-based encryption (SKESK packets) is not affected. Root cause: Vulnerable session key buffer used in PKESK packet generation. The defect was introduced in commit `7bd9a8dc356aae756b40755be76d36205b6b161a` where initialization logic inside `encrypted_build_skesk()` only randomized the key for the SKESK path and omitted it for the PKESK path.",
  "id": "UBUNTU-CVE-2025-13470",
  "modified": "2026-05-20T15:16:03Z",
  "published": "2025-11-21T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-13470"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-13470"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2415863"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/cve-2025-13402"
    },
    {
      "type": "REPORT",
      "url": "https://aur.archlinux.org/packages/rnp"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rnpgp/rnp/commit/7bd9a8dc356aae756b40755be76d36205b6b161a"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rnpgp/rnp/releases/tag/v0.18.1"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/ubuntu/+source/rnp"
    },
    {
      "type": "REPORT",
      "url": "https://open.ribose.com/advisories/ra-2025-11-20/"
    },
    {
      "type": "REPORT",
      "url": "https://packages.gentoo.org/packages/dev-util/librnp"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:Y/RE:H/U:Red",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-13470"
  ]
}



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