pysec - pysec-2023-67

pysec-2023-67

Vulnerability from pysec

Published

2023-05-26 14:15

Modified

2023-06-05 01:12

Details

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of invite_room_state, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized invite_room_state fields. Server operators should upgrade to Synapse 1.74 or newer urgently.

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse",
        "purl": "pkg:pypi/matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.74.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.33.5",
        "0.33.5.1",
        "0.33.6",
        "0.33.6rc1",
        "0.33.7",
        "0.33.7rc1",
        "0.33.7rc2",
        "0.33.8",
        "0.33.8rc2",
        "0.33.9",
        "0.34.0",
        "0.34.0.1",
        "0.34.0rc1",
        "0.34.0rc2",
        "0.34.1.1",
        "0.99.0",
        "0.99.0rc1",
        "0.99.0rc2",
        "0.99.0rc3",
        "0.99.0rc4",
        "0.99.1",
        "0.99.1.1",
        "0.99.1rc1",
        "0.99.1rc2",
        "0.99.2",
        "0.99.2rc1",
        "0.99.3",
        "0.99.3.1",
        "0.99.3.2",
        "0.99.3rc1",
        "0.99.4",
        "0.99.4rc1",
        "0.99.5",
        "0.99.5.1",
        "0.99.5.2",
        "0.99.5rc1",
        "1.0.0",
        "1.0.0rc1",
        "1.0.0rc2",
        "1.0.0rc3",
        "1.1.0",
        "1.1.0rc1",
        "1.1.0rc2",
        "1.10.0",
        "1.10.0rc1",
        "1.10.0rc2",
        "1.10.0rc3",
        "1.10.0rc5",
        "1.10.1",
        "1.11.0",
        "1.11.0rc1",
        "1.11.1",
        "1.12.0",
        "1.12.0rc1",
        "1.12.1",
        "1.12.1rc1",
        "1.12.2",
        "1.12.3",
        "1.12.4",
        "1.12.4rc1",
        "1.13.0",
        "1.13.0rc1",
        "1.13.0rc2",
        "1.13.0rc3",
        "1.14.0",
        "1.14.0rc1",
        "1.14.0rc2",
        "1.15.0",
        "1.15.0rc1",
        "1.15.1",
        "1.15.2",
        "1.16.0",
        "1.16.0rc1",
        "1.16.0rc2",
        "1.16.1",
        "1.17.0",
        "1.17.0rc1",
        "1.18.0",
        "1.18.0rc1",
        "1.18.0rc2",
        "1.19.0",
        "1.19.0rc1",
        "1.19.1",
        "1.19.1rc1",
        "1.19.2",
        "1.19.3",
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        "1.2.1",
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        "1.20.0rc1",
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        "1.20.0rc4",
        "1.20.0rc5",
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        "1.22.1",
        "1.23.0",
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        "1.23.1",
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        "1.24.0rc2",
        "1.25.0",
        "1.25.0rc1",
        "1.26.0",
        "1.26.0rc1",
        "1.26.0rc2",
        "1.27.0",
        "1.27.0rc1",
        "1.27.0rc2",
        "1.28.0",
        "1.28.0rc1",
        "1.29.0",
        "1.29.0rc1",
        "1.3.0",
        "1.3.0rc1",
        "1.3.1",
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        "1.30.0rc1",
        "1.30.1",
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        "1.31.0rc1",
        "1.32.0",
        "1.32.0rc1",
        "1.32.1",
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        "1.33.0",
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        "1.33.0rc2",
        "1.33.1",
        "1.33.2",
        "1.34.0",
        "1.34.0rc1",
        "1.35.0",
        "1.35.0rc1",
        "1.35.0rc2",
        "1.35.0rc3",
        "1.35.1",
        "1.36.0",
        "1.36.0rc1",
        "1.36.0rc2",
        "1.37.0",
        "1.37.0rc1",
        "1.37.1",
        "1.37.1rc1",
        "1.38.0",
        "1.38.0rc1",
        "1.38.0rc2",
        "1.38.0rc3",
        "1.38.1",
        "1.39.0",
        "1.39.0rc1",
        "1.39.0rc2",
        "1.39.0rc3",
        "1.4.0",
        "1.4.0rc1",
        "1.4.0rc2",
        "1.4.1",
        "1.4.1rc1",
        "1.40.0",
        "1.40.0rc1",
        "1.40.0rc2",
        "1.40.0rc3",
        "1.41.0",
        "1.41.0rc1",
        "1.41.1",
        "1.42.0",
        "1.42.0rc1",
        "1.42.0rc2",
        "1.43.0",
        "1.43.0rc1",
        "1.43.0rc2",
        "1.44.0",
        "1.44.0rc1",
        "1.44.0rc2",
        "1.44.0rc3",
        "1.45.0",
        "1.45.0rc1",
        "1.45.0rc2",
        "1.45.1",
        "1.46.0",
        "1.46.0rc1",
        "1.47.0",
        "1.47.0rc1",
        "1.47.0rc2",
        "1.47.0rc3",
        "1.47.1",
        "1.48.0",
        "1.48.0rc1",
        "1.49.0",
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        "1.50.1",
        "1.50.2",
        "1.51.0",
        "1.51.0rc1",
        "1.51.0rc2",
        "1.52.0",
        "1.52.0rc1",
        "1.53.0",
        "1.53.0rc1",
        "1.54.0",
        "1.54.0rc1",
        "1.55.0",
        "1.55.0rc1",
        "1.55.1",
        "1.55.2",
        "1.56.0",
        "1.56.0rc1",
        "1.57.0",
        "1.57.0rc1",
        "1.57.1",
        "1.58.0",
        "1.58.0rc2",
        "1.58.1",
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        "1.59.0rc2",
        "1.59.1",
        "1.6.0",
        "1.6.0rc1",
        "1.6.0rc2",
        "1.6.1",
        "1.60.0",
        "1.60.0rc1",
        "1.60.0rc2",
        "1.61.0",
        "1.61.0rc1",
        "1.61.1",
        "1.62.0",
        "1.62.0rc1",
        "1.62.0rc2",
        "1.62.0rc3",
        "1.63.0",
        "1.63.0rc1",
        "1.63.1",
        "1.64.0",
        "1.64.0rc1",
        "1.64.0rc2",
        "1.65.0",
        "1.65.0rc1",
        "1.65.0rc2",
        "1.66.0",
        "1.66.0rc1",
        "1.66.0rc2",
        "1.67.0",
        "1.67.0rc1",
        "1.68.0",
        "1.68.0rc1",
        "1.68.0rc2",
        "1.69.0",
        "1.69.0rc1",
        "1.69.0rc2",
        "1.69.0rc4",
        "1.7.0",
        "1.7.0rc1",
        "1.7.0rc2",
        "1.7.1",
        "1.7.2",
        "1.7.3",
        "1.70.0",
        "1.70.0rc1",
        "1.70.0rc2",
        "1.70.1",
        "1.71.0",
        "1.71.0rc1",
        "1.71.0rc2",
        "1.72.0",
        "1.72.0rc1",
        "1.73.0",
        "1.73.0rc2",
        "1.74.0rc1",
        "1.8.0",
        "1.8.0rc1",
        "1.9.0",
        "1.9.0.dev1",
        "1.9.0.dev2",
        "1.9.0rc1",
        "1.9.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-32323",
    "GHSA-f3wc-3vxv-xmvr"
  ],
  "details": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.\n\n",
  "id": "PYSEC-2023-67",
  "modified": "2023-06-05T01:12:54.808327Z",
  "published": "2023-05-26T14:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr"
    },
    {
      "type": "FIX",
      "url": "https://github.com/matrix-org/synapse/pull/14642"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/matrix-org/synapse/issues/14492"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/matrix-org/synapse/issues/14492"
    }
  ]
}

ghsa-f3wc-3vxv-xmvr

Vulnerability from github

Published

2023-05-24 17:28

Modified

2024-09-24 15:31

Severity ?

5.0 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L

Summary

Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites

Details

Impact

A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y.

Synapse instances with federation disabled are not affected.

Details

The Matrix protocol allows homeservers to provide an invite_room_state field on a room invite containing a summary of room state. In versions of Synapse up to and including v1.73.0, Synapse did not limit the size of invite_room_state, meaning that it was possible to create an arbitrarily large invite event.

An attacker with an account on a vulnerable Synapse homeserver X could exploit this by having X create an over-sized invite event in a room with a user from another homeserver Y. Once acknowledged by the invitee's homeserver, the invite event would be sent in a batch of events to Y. If the malicious invite is so large that the entire batch is rejected as too large, X's outgoing traffic to Y would become "stuck", meaning that messages and state events created by X would remain unseen by Y.

Patches

Synapse 1.74 refuses to create oversized invite_room_state fields. Server operators should upgrade to Synapse 1.74 or newer urgently.

Workarounds

There are no robust workarounds.

This attack needs an account on Synapse homeserver X to deny federation from X to another homeserver Y. As a partial mitigation, Synapse operators can disable open registration to limit the ability of attackers to create new accounts on homeserver X.

If homeserver X has been attacked in this way, restarting it will resume outgoing federation by entering "catchup mode". For catchup mode to ignore the oversized invites, every attacked room must have a correctly-sized event sent by X which is newer than any oversized invite. This is difficult to arrange, and does not prevent the attacker from repeating their attack.

References

https://github.com/matrix-org/synapse/issues/14492 was caused by this issue.
https://github.com/matrix-org/synapse/issues/14642 includes the patch described above.

For more information

If you have any questions or comments about this advisory, e-mail us at security@matrix.org.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.74.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-32323"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-05-24T17:28:26Z",
    "nvd_published_at": "2023-05-26T14:15:10Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nA malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y.\n\nSynapse instances with federation disabled are not affected.\n\n#### Details\n\nThe Matrix protocol allows homeservers to provide an `invite_room_state` field on a [room invite](https://spec.matrix.org/v1.5/client-server-api/#mroommember) containing a [summary of room state](https://spec.matrix.org/v1.5/client-server-api/#stripped-state).  In versions of Synapse up to and including v1.73.0, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event.\n\nAn attacker with an account on a vulnerable Synapse homeserver X could exploit this by having X create an over-sized invite event in a room with a user from another homeserver Y. Once acknowledged by the invitee\u0027s homeserver, the invite event would be sent in a batch of events to Y. If the malicious invite is so large that the entire batch is rejected as too large, X\u0027s outgoing traffic to Y would become \"stuck\", meaning that messages and state events created by X would remain unseen by Y.\n\n### Patches\n\nSynapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.\n\n### Workarounds\n\nThere are no robust workarounds.\n\nThis attack needs an account on Synapse homeserver X to deny federation from X to another homeserver Y. As a partial mitigation, Synapse operators can disable open registration to limit the ability of attackers to create new accounts on homeserver X.\n\nIf homeserver X has been attacked in this way, restarting it will resume outgoing federation by entering \"catchup mode\". For catchup mode to ignore the oversized invites, every attacked room must have a correctly-sized event sent by X which is newer than any oversized invite. This is difficult to arrange, and does not prevent the attacker from repeating their attack.\n\n### References\n\n- https://github.com/matrix-org/synapse/issues/14492 was caused by this issue.\n- https://github.com/matrix-org/synapse/issues/14642  includes the patch described above.\n\n### For more information\n\nIf you have any questions or comments about this advisory, e-mail us at [security@matrix.org](mailto:security@matrix.org).",
  "id": "GHSA-f3wc-3vxv-xmvr",
  "modified": "2024-09-24T15:31:50Z",
  "published": "2023-05-24T17:28:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-32323"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/issues/14492"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/pull/14642"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/synapse"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-67.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites"
}

cve-2023-32323

Vulnerability from cvelistv5

Published

2023-05-26 13:32

Modified

2024-08-02 15:10

Severity ?

5.0 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

Summary

Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites

References

▼	URL	Tags
	https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr	x_refsource_CONFIRM
	https://github.com/matrix-org/synapse/issues/14492	x_refsource_MISC
	https://github.com/matrix-org/synapse/pull/14642	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/

Impacted products

Vendor

Product

Version

▼

matrix-org

synapse

Version: < 1.74.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T15:10:24.899Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr"
          },
          {
            "name": "https://github.com/matrix-org/synapse/issues/14492",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/issues/14492"
          },
          {
            "name": "https://github.com/matrix-org/synapse/pull/14642",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/pull/14642"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "synapse",
          "vendor": "matrix-org",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.74.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.\n\n"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-05-26T13:32:01.632Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr"
        },
        {
          "name": "https://github.com/matrix-org/synapse/issues/14492",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/matrix-org/synapse/issues/14492"
        },
        {
          "name": "https://github.com/matrix-org/synapse/pull/14642",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/matrix-org/synapse/pull/14642"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/"
        }
      ],
      "source": {
        "advisory": "GHSA-f3wc-3vxv-xmvr",
        "discovery": "UNKNOWN"
      },
      "title": "Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-32323",
    "datePublished": "2023-05-26T13:32:01.632Z",
    "dateReserved": "2023-05-08T13:26:03.880Z",
    "dateUpdated": "2024-08-02T15:10:24.899Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

pysec-2023-67

Vulnerability from pysec

ghsa-f3wc-3vxv-xmvr

Vulnerability from github

Impact

Details

Patches

Workarounds

References

For more information

cve-2023-32323

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature