ubuntu-cve-2023-4421
Vulnerability from osv_ubuntu
Published
2023-12-12 17:15
Modified
2026-04-22 07:45
Summary
Details

The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim's key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS < 3.61.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.28.4-0ubuntu0.14.04.5+esm13"
          },
          {
            "binary_name": "libnss3-1d",
            "binary_version": "2:3.28.4-0ubuntu0.14.04.5+esm13"
          },
          {
            "binary_name": "libnss3-nssdb",
            "binary_version": "2:3.28.4-0ubuntu0.14.04.5+esm13"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.28.4-0ubuntu0.14.04.5+esm13"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.28.4-0ubuntu0.14.04.5+esm13?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.15.1-1ubuntu1",
        "2:3.15.2-1",
        "2:3.15.3-1",
        "2:3.15.3.1-1",
        "2:3.15.3.1-1.1",
        "2:3.15.3.1-1.1ubuntu1",
        "2:3.15.4-1ubuntu3",
        "2:3.15.4-1ubuntu4",
        "2:3.15.4-1ubuntu5",
        "2:3.15.4-1ubuntu6",
        "2:3.15.4-1ubuntu7",
        "2:3.15.4-1ubuntu7.1",
        "2:3.17-0ubuntu0.14.04.1",
        "2:3.17.1-0ubuntu0.14.04.1",
        "2:3.17.1-0ubuntu0.14.04.2",
        "2:3.17.4-0ubuntu0.14.04.1",
        "2:3.19.2-0ubuntu0.14.04.1",
        "2:3.19.2.1-0ubuntu0.14.04.1",
        "2:3.19.2.1-0ubuntu0.14.04.2",
        "2:3.21-0ubuntu0.14.04.1",
        "2:3.21-0ubuntu0.14.04.2",
        "2:3.23-0ubuntu0.14.04.1",
        "2:3.26.2-0ubuntu0.14.04.3",
        "2:3.28.4-0ubuntu0.14.04.1",
        "2:3.28.4-0ubuntu0.14.04.2",
        "2:3.28.4-0ubuntu0.14.04.3",
        "2:3.28.4-0ubuntu0.14.04.4",
        "2:3.28.4-0ubuntu0.14.04.5",
        "2:3.28.4-0ubuntu0.14.04.5+esm1",
        "2:3.28.4-0ubuntu0.14.04.5+esm2",
        "2:3.28.4-0ubuntu0.14.04.5+esm3",
        "2:3.28.4-0ubuntu0.14.04.5+esm4",
        "2:3.28.4-0ubuntu0.14.04.5+esm5",
        "2:3.28.4-0ubuntu0.14.04.5+esm6",
        "2:3.28.4-0ubuntu0.14.04.5+esm7",
        "2:3.28.4-0ubuntu0.14.04.5+esm8",
        "2:3.28.4-0ubuntu0.14.04.5+esm9",
        "2:3.28.4-0ubuntu0.14.04.5+esm10",
        "2:3.28.4-0ubuntu0.14.04.5+esm11",
        "2:3.28.4-0ubuntu0.14.04.5+esm12",
        "2:3.28.4-0ubuntu0.14.04.5+esm13"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.28.4-0ubuntu0.16.04.14+esm5"
          },
          {
            "binary_name": "libnss3-1d",
            "binary_version": "2:3.28.4-0ubuntu0.16.04.14+esm5"
          },
          {
            "binary_name": "libnss3-nssdb",
            "binary_version": "2:3.28.4-0ubuntu0.16.04.14+esm5"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.28.4-0ubuntu0.16.04.14+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.28.4-0ubuntu0.16.04.14+esm5?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.19.2-1ubuntu1",
        "2:3.19.2.1-0ubuntu1",
        "2:3.21-1ubuntu2",
        "2:3.21-1ubuntu3",
        "2:3.21-1ubuntu4",
        "2:3.23-0ubuntu0.16.04.1",
        "2:3.26.2-0ubuntu0.16.04.2",
        "2:3.28.4-0ubuntu0.16.04.1",
        "2:3.28.4-0ubuntu0.16.04.2",
        "2:3.28.4-0ubuntu0.16.04.3",
        "2:3.28.4-0ubuntu0.16.04.4",
        "2:3.28.4-0ubuntu0.16.04.5",
        "2:3.28.4-0ubuntu0.16.04.6",
        "2:3.28.4-0ubuntu0.16.04.8",
        "2:3.28.4-0ubuntu0.16.04.9",
        "2:3.28.4-0ubuntu0.16.04.10",
        "2:3.28.4-0ubuntu0.16.04.11",
        "2:3.28.4-0ubuntu0.16.04.12",
        "2:3.28.4-0ubuntu0.16.04.13",
        "2:3.28.4-0ubuntu0.16.04.14",
        "2:3.28.4-0ubuntu0.16.04.14+esm1",
        "2:3.28.4-0ubuntu0.16.04.14+esm2",
        "2:3.28.4-0ubuntu0.16.04.14+esm3",
        "2:3.28.4-0ubuntu0.16.04.14+esm4",
        "2:3.28.4-0ubuntu0.16.04.14+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.35-2ubuntu2.16+esm1"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.35-2ubuntu2.16+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.35-2ubuntu2.16+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.32-1ubuntu3",
        "2:3.34-1ubuntu1",
        "2:3.35-2ubuntu2",
        "2:3.35-2ubuntu2.1",
        "2:3.35-2ubuntu2.2",
        "2:3.35-2ubuntu2.3",
        "2:3.35-2ubuntu2.5",
        "2:3.35-2ubuntu2.6",
        "2:3.35-2ubuntu2.7",
        "2:3.35-2ubuntu2.8",
        "2:3.35-2ubuntu2.9",
        "2:3.35-2ubuntu2.11",
        "2:3.35-2ubuntu2.12",
        "2:3.35-2ubuntu2.13",
        "2:3.35-2ubuntu2.14",
        "2:3.35-2ubuntu2.15",
        "2:3.35-2ubuntu2.16",
        "2:3.35-2ubuntu2.16+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.98-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.98-0ubuntu0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.98-0ubuntu0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:3.98-0ubuntu0.20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.45-1ubuntu2",
        "2:3.47-1ubuntu1",
        "2:3.47-1ubuntu2",
        "2:3.48-1ubuntu1",
        "2:3.49.1-1ubuntu1",
        "2:3.49.1-1ubuntu1.1",
        "2:3.49.1-1ubuntu1.2",
        "2:3.49.1-1ubuntu1.4",
        "2:3.49.1-1ubuntu1.5",
        "2:3.49.1-1ubuntu1.6",
        "2:3.49.1-1ubuntu1.7",
        "2:3.49.1-1ubuntu1.8",
        "2:3.49.1-1ubuntu1.9"
      ]
    }
  ],
  "aliases": [],
  "details": "The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim\u0027s key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS \u003c 3.61.",
  "id": "UBUNTU-CVE-2023-4421",
  "modified": "2026-04-22T07:45:06Z",
  "published": "2023-12-12T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-4421"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2023-4421"
    },
    {
      "type": "REPORT",
      "url": "https://people.redhat.com/~hkario/marvin/"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2023-53/"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6727-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-4421"
    }
  ],
  "related": [
    "USN-6727-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-4421"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.


Detection rules are retrieved from Rulezet.