Vulnerability-Lookup

CVE-2024-37302 (GCVE-0-2024-37302)

Vulnerability from cvelistv5 – Published: 2024-12-03 17:04 – Updated: 2024-12-03 18:56

Title

Synapse denial of service through media disk space consumption

Summary

Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new "leaky bucket" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

https://github.com/element-hq/synapse/security/ad…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	element-hq	synapse	Affected: < 1.106

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:element-hq:synapse:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "synapse",
            "vendor": "element-hq",
            "versions": [
              {
                "lessThan": "1.106",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-37302",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-12-03T18:55:21.581964Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-12-03T18:56:17.082Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "synapse",
          "vendor": "element-hq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.106"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new \"leaky bucket\" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user\u0027s ability to request large amounts of data to be cached."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-03T17:04:15.839Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x"
        }
      ],
      "source": {
        "advisory": "GHSA-4mhg-xv73-xq2x",
        "discovery": "UNKNOWN"
      },
      "title": "Synapse denial of service through media disk space consumption"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-37302",
    "datePublished": "2024-12-03T17:04:15.839Z",
    "dateReserved": "2024-06-05T20:10:46.497Z",
    "dateUpdated": "2024-12-03T18:56:17.082Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-37302\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-03T18:55:21.581964Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:element-hq:synapse:*:*:*:*:*:*:*:*\"], \"vendor\": \"element-hq\", \"product\": \"synapse\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.106\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-12-03T18:55:52.653Z\"}}], \"cna\": {\"title\": \"Synapse denial of service through media disk space consumption\", \"source\": {\"advisory\": \"GHSA-4mhg-xv73-xq2x\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"element-hq\", \"product\": \"synapse\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.106\"}]}], \"references\": [{\"url\": \"https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x\", \"name\": \"https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new \\\"leaky bucket\\\" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user\u0027s ability to request large amounts of data to be cached.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2024-12-03T17:04:15.839Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-37302\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-03T18:56:17.082Z\", \"dateReserved\": \"2024-06-05T20:10:46.497Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2024-12-03T17:04:15.839Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

GHSA-4MHG-XV73-XQ2X

Vulnerability from github – Published: 2024-12-03 18:39 – Updated: 2024-12-03 18:39

Summary

Synapse denial of service through media disk space consumption

Details

Impact

Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed.

Patches

Synapse 1.106 introduces a new "leaky bucket" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached.

Workarounds

Synapse deployments can currently decrease the maximum file size allowed, as well as increase request rate limits. However, this does not as effectively address the issue as a dedicated rate limit on remote media downloads.

Server operators may also wish to consider putting media on a dedicated disk or volume, reducing the impact of a disk fill condition.

References

https://en.wikipedia.org/wiki/Leaky_bucket#As_a_meter

For more information

If you have any questions or comments about this advisory, please email us at security at element.io.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.106"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-37302"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-12-03T18:39:12Z",
    "nvd_published_at": "2024-12-03T17:15:10Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nSynapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed.\n\n### Patches\n\nSynapse 1.106 introduces a new \"leaky bucket\" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user\u0027s ability to request large amounts of data to be cached.\n\n### Workarounds\n\nSynapse deployments can currently decrease the maximum file size allowed, as well as increase request rate limits. However, this does not as effectively address the issue as a dedicated rate limit on remote media downloads.\n\nServer operators may also wish to consider putting media on a dedicated disk or volume, reducing the impact of a disk fill condition.\n\n### References\n\n* https://en.wikipedia.org/wiki/Leaky_bucket#As_a_meter\n\n### For more information\n\nIf you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).",
  "id": "GHSA-4mhg-xv73-xq2x",
  "modified": "2024-12-03T18:39:13Z",
  "published": "2024-12-03T18:39:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-37302"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/element-hq/synapse"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Synapse denial of service through media disk space consumption"
}

FKIE_CVE-2024-37302

Vulnerability from fkie_nvd - Published: 2024-12-03 17:15 - Updated: 2025-08-26 15:12

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x	Vendor Advisory

Impacted products

	Vendor	Product	Version
	matrix	synapse	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F7574431-51E3-465D-A1B9-5D05FD28160B",
              "versionEndExcluding": "1.106.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new \"leaky bucket\" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user\u0027s ability to request large amounts of data to be cached."
    },
    {
      "lang": "es",
      "value": "Synapse es un servidor dom\u00e9stico Matrix de c\u00f3digo abierto. Las versiones de Synapse anteriores a la 1.106 son vulnerables a un ataque de llenado de disco, en el que un adversario no autenticado puede inducir a Synapse a descargar y almacenar en cach\u00e9 grandes cantidades de medios remotos. La estrategia de l\u00edmite de velocidad predeterminada no es suficiente para mitigar esto. Esto puede provocar una denegaci\u00f3n de servicio, que puede ir desde el fallo de las futuras cargas/descargas de medios hasta la indisponibilidad total del proceso Synapse, seg\u00fan c\u00f3mo se haya implementado Synapse. Synapse 1.106 introduce un nuevo l\u00edmite de velocidad de \"dep\u00f3sito con fugas\" en las descargas de medios remotos para reducir la cantidad de datos que un usuario puede solicitar a la vez. Esto no soluciona por completo el problema, pero s\u00ed limita la capacidad de un usuario no autenticado de solicitar que se almacenen en cach\u00e9 grandes cantidades de datos."
    }
  ],
  "id": "CVE-2024-37302",
  "lastModified": "2025-08-26T15:12:35.167",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2024-12-03T17:15:10.733",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-4mhg-xv73-xq2x"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

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

CVE-2024-37302 (GCVE-0-2024-37302)

GHSA-4MHG-XV73-XQ2X

Impact

Patches

Workarounds

References

For more information

FKIE_CVE-2024-37302

Tags

Sightings

Nomenclature