GHSA-3HFW-X7GX-437C

Vulnerability from github – Published: 2021-11-23 21:58 – Updated: 2024-09-24 15:47
VLAI?
Summary
Path traversal in Matrix Synapse
Details

Impact

Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory, potentially outside the media store directory.

The last two directories and file name of the path are chosen randomly by Synapse and cannot be controlled by an attacker, which limits the impact.

Homeservers with the media repository disabled are unaffected. Homeservers configured with a federation whitelist are also unaffected.

Patches

Server administrators should upgrade to 1.47.1 or later.

Workarounds

Server administrators using a reverse proxy could, at the expense of losing media functionality, block the following endpoints:

  • /_matrix/media/r0/download/{serverName}/{mediaId}
  • /_matrix/media/r0/download/{serverName}/{mediaId}/{fileName}
  • /_matrix/media/r0/thumbnail/{serverName}/{mediaId}

Alternatively, non-containerized deployments can be adapted to use the hardened systemd config, located at contrib/systemd/override-hardened.conf.

References

n/a

For more information

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

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.47.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-41281"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-11-23T18:44:39Z",
    "nvd_published_at": "2021-11-23T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nSynapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory, potentially outside the media store directory.\n\nThe last two directories and file name of the path are chosen randomly by Synapse and cannot be controlled by an attacker, which limits the impact.\n\nHomeservers with the media repository disabled are unaffected. Homeservers configured with a federation whitelist are also unaffected.\n\n### Patches\nServer administrators should upgrade to 1.47.1 or later.\n\n### Workarounds\nServer administrators using a reverse proxy could, at the expense of losing media functionality, block the following endpoints:\n\n* `/_matrix/media/r0/download/{serverName}/{mediaId}`\n* `/_matrix/media/r0/download/{serverName}/{mediaId}/{fileName}`\n* `/_matrix/media/r0/thumbnail/{serverName}/{mediaId}`\n\nAlternatively, non-containerized deployments can be adapted to use the hardened systemd config, located at `contrib/systemd/override-hardened.conf`.\n\n### References\nn/a\n\n### For more information\n\nIf you have any questions or comments about this advisory, e-mail us at security@matrix.org.\n",
  "id": "GHSA-3hfw-x7gx-437c",
  "modified": "2024-09-24T15:47:18Z",
  "published": "2021-11-23T21:58:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41281"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/91f2bd090"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/synapse"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/releases/tag/v1.47.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-436.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EU7QRE55U4IUEDLKT5IYPWL3UXMELFAS"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N3WY56LCEZ4ZECLWV5KMAXF2PSMUB4F2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Path traversal in Matrix Synapse"
}


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  • 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.