csaf_certbund - wid-sec-w-2023-2787

WID-SEC-W-2023-2787

Vulnerability from csaf_certbund - Published: 2023-10-31 23:00 - Updated: 2025-05-01 22:00

Summary

Mozilla NSS: Schwachstelle ermöglicht Offenlegung von Informationen

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

Network Security Services (NSS) ist eine Sammlung von Bibliotheken um bei plattform übergreifenden Entwicklungen Securityfunktionalitäten für Clients und Server bereitzustellen.

Angriff

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Mozilla NSS ausnutzen, um Informationen offenzulegen.

Betroffene Betriebssysteme

- Linux - Sonstiges - UNIX - Windows

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Network Security Services (NSS) ist eine Sammlung von Bibliotheken um bei plattform \u00fcbergreifenden Entwicklungen Securityfunktionalit\u00e4ten f\u00fcr Clients und Server bereitzustellen.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Mozilla NSS ausnutzen, um Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- Sonstiges\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2023-2787 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-2787.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2023-2787 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-2787"
      },
      {
        "category": "external",
        "summary": "RedHat Bugzilla vom 2023-10-31",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2238677"
      },
      {
        "category": "external",
        "summary": "RedHat Customer Portal vom 2023-10-31",
        "url": "https://access.redhat.com/security/cve/cve-2023-4421"
      },
      {
        "category": "external",
        "summary": "Mozilla Security Advisory MFSA2023-53 vom 2023-12-12",
        "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2023-53/"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-6727-1 vom 2024-04-10",
        "url": "https://ubuntu.com/security/notices/USN-6727-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-6727-2 vom 2024-04-11",
        "url": "https://ubuntu.com/security/notices/USN-6727-2"
      },
      {
        "category": "external",
        "summary": "Amazon Linux Security Advisory ALAS-2025-2835 vom 2025-04-30",
        "url": "https://alas.aws.amazon.com/AL2/ALAS-2025-2835.html"
      }
    ],
    "source_lang": "en-US",
    "title": "Mozilla NSS: Schwachstelle erm\u00f6glicht Offenlegung von Informationen",
    "tracking": {
      "current_release_date": "2025-05-01T22:00:00.000+00:00",
      "generator": {
        "date": "2025-05-02T08:13:11.254+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.12"
        }
      },
      "id": "WID-SEC-W-2023-2787",
      "initial_release_date": "2023-10-31T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2023-10-31T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2023-12-12T23:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Mozilla aufgenommen"
        },
        {
          "date": "2024-04-10T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2024-04-11T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-05-01T22:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Amazon aufgenommen"
        }
      ],
      "status": "final",
      "version": "5"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Amazon Linux 2",
            "product": {
              "name": "Amazon Linux 2",
              "product_id": "398363",
              "product_identification_helper": {
                "cpe": "cpe:/o:amazon:linux_2:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Amazon"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c3.61",
                "product": {
                  "name": "Mozilla NSS \u003c3.61",
                  "product_id": "T030868"
                }
              },
              {
                "category": "product_version",
                "name": "3.61",
                "product": {
                  "name": "Mozilla NSS 3.61",
                  "product_id": "T030868-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:mozilla:network_security_services:3.61"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "NSS"
          }
        ],
        "category": "vendor",
        "name": "Mozilla"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T000126",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-4421",
      "product_status": {
        "known_affected": [
          "T000126",
          "T030868",
          "398363"
        ]
      },
      "release_date": "2023-10-31T23:00:00.000+00:00",
      "title": "CVE-2023-4421"
    }
  ]
}

CVE-2023-4421 (GCVE-0-2023-4421)

Vulnerability from cvelistv5 – Published: 2023-12-12 17:02 – Updated: 2025-11-04 19:25

Summary

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 ?

No CVSS data available.

CWE

Timing side-channel in PKCS#1 v1.5 decryption depadding code

Assigner

mozilla

References

URL

Tags

	https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
	https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

	Vendor	Product	Version
	Mozilla	NSS	Affected: unspecified , < 3.61 (custom)

Credits

Hubert Kario

Show details on NVD website

JSON

To clipboard

{
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    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T19:25:18.220Z",
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        "references": [
          {
            "tags": [
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            ],
            "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1651411"
          },
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            "tags": [
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            ],
            "url": "https://www.mozilla.org/security/advisories/mfsa2023-53/"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00039.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "product": "NSS",
          "vendor": "Mozilla",
          "versions": [
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              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Hubert Kario"
        }
      ],
      "descriptions": [
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              "base64": false,
              "type": "text/html",
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            }
          ],
          "value": "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."
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      "problemTypes": [
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    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
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    "datePublished": "2023-12-12T17:02:08.801Z",
    "dateReserved": "2023-08-18T13:25:38.056Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

WID-SEC-W-2023-2787

CVE-2023-4421 (GCVE-0-2023-4421)

Tags

Sightings

Nomenclature