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CVE-2020-12402 (GCVE-0-2020-12402)

Vulnerability from cvelistv5 – Published: 2020-07-09 14:53 – Updated: 2024-08-04 11:56
VLAI
Summary
During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.
Severity
4.4 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
CWE
  • RSA Key Generation vulnerable to side-channel attack
Assigner
References
URL Tags
https://www.mozilla.org/security/advisories/mfsa2… x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1631597 x_refsource_MISC
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://usn.ubuntu.com/4417-1/ vendor-advisoryx_refsource_UBUNTU
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://www.debian.org/security/2020/dsa-4726 vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://security.gentoo.org/glsa/202007-10 vendor-advisoryx_refsource_GENTOO
https://usn.ubuntu.com/4417-2/ vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version CPE status
Mozilla Firefox Affected: unspecified , < 78 (custom)
guessed Create a notification for this product.
Show details on NVD website
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          "url": "https://www.mozilla.org/security/advisories/mfsa2020-24/"
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      "sourceIdentifier": "security@mozilla.org",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-203"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
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                    "matchCriteriaId": "09FA5356-4843-47D3-964C-86A6C3859F3C",
                    "versionEndExcluding": "78.0",
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            "value": "During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox \u003c 78."
          },
          {
            "lang": "es",
            "value": "Durante la generaci\u00f3n de claves RSA, las implementaciones de bignum usaron una variaci\u00f3n del Binary Extended Euclidean Algorithm que implicaba un flujo significativamente dependiente de la entrada. Esto permiti\u00f3 a un atacante poder llevar a cabo ataques de canal lateral basados ??en electromagnetismo para registrar trazas conllevando a la recuperaci\u00f3n de los principales secretos. *Nota:* Un navegador Firefox no modificado no genera claves RSA en funcionamiento normal y no est\u00e1 afectado, pero los productos creados sobre \u00e9l s\u00ed pueden. Esta vulnerabilidad afecta a Firefox versiones anteriores a 78"
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              "obtainAllPrivilege": false,
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              "obtainUserPrivilege": false,
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
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          {
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        "sourceIdentifier": "security@mozilla.org",
        "vulnStatus": "Modified",
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-26T22:35:24+00:00",
      "cve": "CVE-2020-12402",
      "id": "CVE-2020-12402",
      "initial_release_date": "2020-06-02T12:00:00+00:00",
      "product_status:fixed": "332",
      "product_status:known_affected": "7",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nss: Side channel vulnerabilities during RSA key generation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-12402.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:33:47Z",
      "cve": "CVE-2020-12402",
      "id": "CVE-2020-12402",
      "initial_release_date": "2023-02-15T03:59:07Z",
      "product_status:known_affected": "516",
      "product_status:known_not_affected": "5",
      "product_status:recommended": "1797",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-12402",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-12402.json",
      "version": "46"
    }
  }
}



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Tags
Taxonomy of the tags.





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.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.