CVE-2024-7531 (GCVE-0-2024-7531)

Vulnerability from cvelistv5 – Published: 2024-08-06 12:38 – Updated: 2025-03-19 15:51
VLAI
Summary
Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1.
Severity
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • PK11_Encrypt using CKM_CHACHA20 can reveal plaintext on Intel Sandy Bridge machines
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox Affected: unspecified , < 129 (custom)
Create a notification for this product.
Mozilla Firefox ESR Affected: unspecified , < 115.14 (custom)
Create a notification for this product.
Mozilla Firefox ESR Affected: unspecified , < 128.1 (custom)
Create a notification for this product.
Credits
Lars Eggert
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 6.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-7531",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-08-16T16:06:38.593212Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-367",
                "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-03-19T15:51:59.396Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "129",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox ESR",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "115.14",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox ESR",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "128.1",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Lars Eggert"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Calling \u003ccode\u003ePK11_Encrypt()\u003c/code\u003e in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox \u003c 129, Firefox ESR \u003c 115.14, and Firefox ESR \u003c 128.1."
            }
          ],
          "value": "Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox \u003c 129, Firefox ESR \u003c 115.14, and Firefox ESR \u003c 128.1."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "PK11_Encrypt using CKM_CHACHA20 can reveal plaintext on Intel Sandy Bridge machines",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-08-06T12:38:15.496Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1905691"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2024-33/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2024-34/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2024-35/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2024-7531",
    "datePublished": "2024-08-06T12:38:15.496Z",
    "dateReserved": "2024-08-05T23:30:25.255Z",
    "dateUpdated": "2025-03-19T15:51:59.396Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-7531",
      "date": "2026-06-02",
      "epss": "0.00062",
      "percentile": "0.19504"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"129.0\", \"matchCriteriaId\": \"12C9ABF7-3B44-4C24-B152-488DCF9E2D39\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"115.14.0\", \"matchCriteriaId\": \"95A2A856-7C7A-46A3-A2B5-967E63D7083A\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:mozilla:firefox_esr:128.0:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"AE7D7BC3-F9A8-42D3-8C60-464457B7B2CC\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox \u003c 129, Firefox ESR \u003c 115.14, and Firefox ESR \u003c 128.1.\"}, {\"lang\": \"es\", \"value\": \"Llamar a `PK11_Encrypt()` en NSS usando CKM_CHACHA20 y el mismo b\\u00fafer para entrada y salida puede generar texto plano en un procesador Intel Sandy Bridge. En Firefox, esto solo afecta la funci\\u00f3n de protecci\\u00f3n del encabezado QUIC cuando la conexi\\u00f3n utiliza el conjunto de cifrado ChaCha20-Poly1305. El resultado m\\u00e1s probable es una falla en la conexi\\u00f3n, pero si la conexi\\u00f3n persiste a pesar de la gran p\\u00e9rdida de paquetes, un observador de la red podr\\u00eda identificar que los paquetes provienen de la misma fuente a pesar de un cambio en la ruta de la red. Esta vulnerabilidad afecta a Firefox \u0026lt; 129, Firefox ESR \u0026lt; 115.14 y Firefox ESR \u0026lt; 128.1.\"}]",
      "id": "CVE-2024-7531",
      "lastModified": "2024-10-30T21:35:13.070",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N\", \"baseScore\": 6.5, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 2.8, \"impactScore\": 3.6}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L\", \"baseScore\": 6.3, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"LOW\"}, \"exploitabilityScore\": 2.8, \"impactScore\": 3.4}]}",
      "published": "2024-08-06T13:15:57.787",
      "references": "[{\"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1905691\", \"source\": \"security@mozilla.org\", \"tags\": [\"Issue Tracking\", \"Permissions Required\"]}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2024-33/\", \"source\": \"security@mozilla.org\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2024-34/\", \"source\": \"security@mozilla.org\", \"tags\": [\"Vendor Advisory\"]}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2024-35/\", \"source\": \"security@mozilla.org\", \"tags\": [\"Vendor Advisory\"]}]",
      "sourceIdentifier": "security@mozilla.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-noinfo\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-7531\",\"sourceIdentifier\":\"security@mozilla.org\",\"published\":\"2024-08-06T13:15:57.787\",\"lastModified\":\"2025-03-19T16:15:29.570\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox \u003c 129, Firefox ESR \u003c 115.14, and Firefox ESR \u003c 128.1.\"},{\"lang\":\"es\",\"value\":\"Llamar a `PK11_Encrypt()` en NSS usando CKM_CHACHA20 y el mismo b\u00fafer para entrada y salida puede generar texto plano en un procesador Intel Sandy Bridge. En Firefox, esto solo afecta la funci\u00f3n de protecci\u00f3n del encabezado QUIC cuando la conexi\u00f3n utiliza el conjunto de cifrado ChaCha20-Poly1305. El resultado m\u00e1s probable es una falla en la conexi\u00f3n, pero si la conexi\u00f3n persiste a pesar de la gran p\u00e9rdida de paquetes, un observador de la red podr\u00eda identificar que los paquetes provienen de la misma fuente a pesar de un cambio en la ruta de la red. Esta vulnerabilidad afecta a Firefox \u0026lt; 129, Firefox ESR \u0026lt; 115.14 y Firefox ESR \u0026lt; 128.1.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L\",\"baseScore\":6.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.8,\"impactScore\":3.4}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-367\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"129.0\",\"matchCriteriaId\":\"12C9ABF7-3B44-4C24-B152-488DCF9E2D39\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"115.14.0\",\"matchCriteriaId\":\"95A2A856-7C7A-46A3-A2B5-967E63D7083A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox_esr:128.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"AE7D7BC3-F9A8-42D3-8C60-464457B7B2CC\"}]}]}],\"references\":[{\"url\":\"https://bugzilla.mozilla.org/show_bug.cgi?id=1905691\",\"source\":\"security@mozilla.org\",\"tags\":[\"Issue Tracking\",\"Permissions Required\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2024-33/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2024-34/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2024-35/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-7531\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-08-16T16:06:38.593212Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-367\", \"description\": \"CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-08-16T16:06:48.387Z\"}}], \"cna\": {\"credits\": [{\"lang\": \"en\", \"value\": \"Lars Eggert\"}], \"affected\": [{\"vendor\": \"Mozilla\", \"product\": \"Firefox\", \"versions\": [{\"status\": \"affected\", \"version\": \"unspecified\", \"lessThan\": \"129\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Mozilla\", \"product\": \"Firefox ESR\", \"versions\": [{\"status\": \"affected\", \"version\": \"unspecified\", \"lessThan\": \"115.14\", \"versionType\": \"custom\"}]}, {\"vendor\": \"Mozilla\", \"product\": \"Firefox ESR\", \"versions\": [{\"status\": \"affected\", \"version\": \"unspecified\", \"lessThan\": \"128.1\", \"versionType\": \"custom\"}]}], \"references\": [{\"url\": \"https://bugzilla.mozilla.org/show_bug.cgi?id=1905691\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2024-33/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2024-34/\"}, {\"url\": \"https://www.mozilla.org/security/advisories/mfsa2024-35/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox \u003c 129, Firefox ESR \u003c 115.14, and Firefox ESR \u003c 128.1.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Calling \u003ccode\u003ePK11_Encrypt()\u003c/code\u003e in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox \u003c 129, Firefox ESR \u003c 115.14, and Firefox ESR \u003c 128.1.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"PK11_Encrypt using CKM_CHACHA20 can reveal plaintext on Intel Sandy Bridge machines\"}]}], \"providerMetadata\": {\"orgId\": \"f16b083a-5664-49f3-a51e-8d479e5ed7fe\", \"shortName\": \"mozilla\", \"dateUpdated\": \"2024-08-06T12:38:15.496Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-7531\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-19T15:51:59.396Z\", \"dateReserved\": \"2024-08-05T23:30:25.255Z\", \"assignerOrgId\": \"f16b083a-5664-49f3-a51e-8d479e5ed7fe\", \"datePublished\": \"2024-08-06T12:38:15.496Z\", \"assignerShortName\": \"mozilla\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




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.