Vulnerability-Lookup

FKIE_CVE-2020-12402

Vulnerability from fkie_nvd - Published: 2020-07-09 15:15 - Updated: 2026-06-17 02:51

Severity

4.4 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

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.

References

URL	Tags
security@mozilla.org	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html	Third Party Advisory
security@mozilla.org	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html	Third Party Advisory
security@mozilla.org	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html	Third Party Advisory
security@mozilla.org	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html	Third Party Advisory
security@mozilla.org	https://bugzilla.mozilla.org/show_bug.cgi?id=1631597	Issue Tracking, Permissions Required, Vendor Advisory
security@mozilla.org	https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html	Mailing List, Third Party Advisory
security@mozilla.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/
security@mozilla.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/
security@mozilla.org	https://security.gentoo.org/glsa/202007-10	Third Party Advisory
security@mozilla.org	https://usn.ubuntu.com/4417-1/	Third Party Advisory
security@mozilla.org	https://usn.ubuntu.com/4417-2/	Third Party Advisory
security@mozilla.org	https://www.debian.org/security/2020/dsa-4726	Third Party Advisory
security@mozilla.org	https://www.mozilla.org/security/advisories/mfsa2020-24/	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://bugzilla.mozilla.org/show_bug.cgi?id=1631597	Issue Tracking, Permissions Required, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/
af854a3a-2127-422b-91ae-364da2661108	https://security.gentoo.org/glsa/202007-10	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://usn.ubuntu.com/4417-1/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://usn.ubuntu.com/4417-2/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.debian.org/security/2020/dsa-4726	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.mozilla.org/security/advisories/mfsa2020-24/	Vendor Advisory

Impacted products

Vendor	Product	Version
mozilla	firefox	*
fedoraproject	fedora	32
opensuse	leap	15.1
opensuse	leap	15.2
debian	debian_linux	9.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "78",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@mozilla.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "09FA5356-4843-47D3-964C-86A6C3859F3C",
              "versionEndExcluding": "78.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
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              "vulnerable": true
            },
            {
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              "matchCriteriaId": "B620311B-34A3-48A6-82DF-6F078D7A4493",
              "vulnerable": true
            },
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    {
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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"
    }
  ],
  "id": "CVE-2020-12402",
  "lastModified": "2026-06-17T02:51:46.010",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "HIGH",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 1.2,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:L/AC:H/Au:N/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 1.9,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
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        "exploitabilityScore": 0.8,
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        "source": "nvd@nist.gov",
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  "published": "2020-07-09T15:15:10.820",
  "references": [
    {
      "source": "security@mozilla.org",
      "tags": [
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    {
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      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/"
    },
    {
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    {
      "source": "security@mozilla.org",
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      "url": "https://security.gentoo.org/glsa/202007-10"
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  ],
  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
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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

Summary

Severity

No CVSS data available.

CWE

RSA Key Generation vulnerable to side-channel attack

Assigner

mozilla mitre root

References

13 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

1 product

Vendor	Product	Version
Mozilla	Firefox	Affected: unspecified , < 78 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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          "dateUpdated": "2024-08-04T11:56:51.801Z",
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    ],
    "cna": {
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        {
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          "vendor": "Mozilla",
          "versions": [
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        }
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      "problemTypes": [
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        },
        {
          "name": "USN-4417-1",
          "tags": [
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            "x_refsource_UBUNTU"
          ],
          "url": "https://usn.ubuntu.com/4417-1/"
        },
        {
          "name": "openSUSE-SU-2020:0983",
          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html"
        },
        {
          "name": "DSA-4726",
          "tags": [
            "vendor-advisory",
            "x_refsource_DEBIAN"
          ],
          "url": "https://www.debian.org/security/2020/dsa-4726"
        },
        {
          "name": "FEDORA-2020-3ef1937475",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/"
        },
        {
          "name": "openSUSE-SU-2020:1017",
          "tags": [
            "vendor-advisory",
            "x_refsource_SUSE"
          ],
          "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html"
        },
        {
          "name": "GLSA-202007-10",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202007-10"
        },
        {
          "name": "USN-4417-2",
          "tags": [
            "vendor-advisory",
            "x_refsource_UBUNTU"
          ],
          "url": "https://usn.ubuntu.com/4417-2/"
        },
        {
          "name": "FEDORA-2020-16741ac7ff",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/"
        },
        {
          "name": "[debian-lts-announce] 20200929 [SECURITY] [DLA 2388-1] nss security update",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@mozilla.org",
          "ID": "CVE-2020-12402",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Firefox",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_value": "78"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Mozilla"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
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            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "RSA Key Generation vulnerable to side-channel attack"
                }
              ]
            }
          ]
        },
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          "reference_data": [
            {
              "name": "https://www.mozilla.org/security/advisories/mfsa2020-24/",
              "refsource": "MISC",
              "url": "https://www.mozilla.org/security/advisories/mfsa2020-24/"
            },
            {
              "name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1631597",
              "refsource": "MISC",
              "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1631597"
            },
            {
              "name": "openSUSE-SU-2020:0953",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html"
            },
            {
              "name": "openSUSE-SU-2020:0955",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html"
            },
            {
              "name": "USN-4417-1",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4417-1/"
            },
            {
              "name": "openSUSE-SU-2020:0983",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html"
            },
            {
              "name": "DSA-4726",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2020/dsa-4726"
            },
            {
              "name": "FEDORA-2020-3ef1937475",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/"
            },
            {
              "name": "openSUSE-SU-2020:1017",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html"
            },
            {
              "name": "GLSA-202007-10",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202007-10"
            },
            {
              "name": "USN-4417-2",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4417-2/"
            },
            {
              "name": "FEDORA-2020-16741ac7ff",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/"
            },
            {
              "name": "[debian-lts-announce] 20200929 [SECURITY] [DLA 2388-1] nss security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2020-12402",
    "datePublished": "2020-07-09T14:53:22.000Z",
    "dateReserved": "2020-04-28T00:00:00.000Z",
    "dateUpdated": "2024-08-04T11:56:51.801Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.