CVE-2022-31052: Matrix synapse URL Previews Of Unusual Or Vulnerability

Q: What is CVE-2022-31052?

CVE-2022-31052 is a security vulnerability in Matrix synapse involving URL previews of unusual or maliciously-crafted pages can crash Synapse media repositories or Synapse monoliths under CWE-674: Uncontrolled Recursion.

Q: Which Matrix synapse versions are affected?

Affected versions include releases prior to 1.61.1 across affected packages: matrix-synapse.

Q: What version fixes CVE-2022-31052?

Upgrading to 1.61.1 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is matrix-synapse affected?

Yes, matrix-synapse is affected in releases prior to 1.61.1. Upgrade your dependency to 1.61.1 or later.

Q: What is the CVSS score of CVE-2022-31052?

CVE-2022-31052 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Q: What CWE is associated with CVE-2022-31052?

CVE-2022-31052 is classified under CWE-674: Uncontrolled Recursion (The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.).

Q: How can I check PyPI dependencies for CVE-2022-31052?

Run the dependency tree command: 'pip show matrix-synapse'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-22p3-qrh9-cx32

CVSS 6.5

CWE-674

Published 2022-06-29

Advisory Summary

CVE-2022-31052 is a HIGH (CVSS 6.5) url previews of unusual or vulnerability (CWE-674: Uncontrolled Recursion) affecting Matrix synapse libraries in the PyPI ecosystem. The issue involves url previews of unusual or maliciously-crafted pages can crash synapse media repositories or synapse monoliths. Remediation is available by upgrading affected packages to version 1.61.1.

CVE-2022-31052 at a Glance

CVE Identifier CVE-2022-31052

GHSA Identifier GHSA-22p3-qrh9-cx32

Severity HIGH

CVSS v3.1 Base Score 6.5

CWE Classification CWE-674: Uncontrolled Recursion

Affected Product Matrix synapse

Package Ecosystem PyPI

Published Date 2022-06-29

Last Updated 2024-09-30

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

How to Fix CVE-2022-31052

To remediate this vulnerability, upgrade all affected Matrix synapse dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

matrix-synapse fixed: 1.61.1

pip install matrix-synapse>=1.61.1

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

pip show matrix-synapse

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-31052, inspect your installed packages using pip:

pip show matrix-synapse

Analyze the terminal output to locate any version of Matrix synapse in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.61.1), your application is affected.

Note: The pip show matrix-synapse command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-674: Uncontrolled Recursion, where the product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. In Matrix synapse, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because [the URL preview endpoint is authenticated](https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url). ### Am I affected? * deployments with `url_preview_enabled: false` set in configuration are not affected. * deployments with `url_preview_enabled: true` set in configuration **are** affected. * deployments with no configuration value set for `url_preview_enabled` are not affected, because the default is `false`. ### Patches Administrators of homeservers with URL previews enabled are advised to upgrade to v1.61.1 or higher. ### Workarounds * URL previews can be disabled in the configuration file by setting `url_preview_enabled: false`. * Deployments using workers can choose to offload URL previews to one or more dedicated worker(s), ensuring that a process crash does not disrupt other functionality of Synapse. ### For more information If you have any questions or comments about this advisory, e-mail us at [security@matrix.org](mailto:security@matrix.org).

CVE-2022-31052 Affected Matrix synapse Versions

1 component(s)

Fixed Versions:

1.61.1

Product / Package	Ecosystem	Affected Versions	Fixed Version
matrix-synapse pypi/matrix-synapse	PyPI	< 1.61.1	1.61.1

References

GitHub Advisory / Wiki ADVISORY

https://github.com/matrix-org/synapse/security/advisories/GHSA-22p3-qrh9-cx32

NVD — CVE-2022-31052 NVD

https://nvd.nist.gov/vuln/detail/CVE-2022-31052

Security Fix Commit FIX COMMIT

https://github.com/matrix-org/synapse/commit/fa1308061802ac7b7d20e954ba7372c5ac292333

Matrix synapse Source Repository REPOSITORY

https://github.com/matrix-org/synapse

Matrix synapse Source Repository REPOSITORY

https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2022-224.yaml

lists.fedoraproject.org/archives/list/packa... WEB

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF

lists.fedoraproject.org/archives/list/packa... WEB

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD

spec.matrix.org/v1.2/client-server-... WEB

https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url

Frequently Asked Questions

What is CVE-2022-31052?

CVE-2022-31052 is a security vulnerability in Matrix synapse involving URL previews of unusual or maliciously-crafted pages can crash Synapse media repositories or Synapse monoliths under CWE-674: Uncontrolled Recursion.

Which Matrix synapse versions are affected?

Affected versions include releases prior to 1.61.1 across affected packages: matrix-synapse.

What version fixes CVE-2022-31052?

Upgrading to 1.61.1 (or the latest patched release for your respective branch) resolves the vulnerability.

Is matrix-synapse affected?

Yes, matrix-synapse is affected in releases prior to 1.61.1. Upgrade your dependency to 1.61.1 or later.

What is the CVSS score of CVE-2022-31052?

CVE-2022-31052 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

What CWE is associated with CVE-2022-31052?

CVE-2022-31052 is classified under CWE-674: Uncontrolled Recursion (The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.).

How can I check PyPI dependencies for CVE-2022-31052?

Run the dependency tree command: 'pip show matrix-synapse'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-22p3-qrh9-cx32",
  "modified" : "2024-09-30T20:29:11Z",
  "published" : "2022-06-29T21:51:23Z",
  "aliases" : [ "CVE-2022-31052" ],
  "summary" : "URL previews of unusual or maliciously-crafted pages can crash Synapse media repositories or Synapse monoliths",
  "details" : "### Impact\n\nURL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion.\nThis is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether.\n\nIt is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for.\nRemote users are not able to exploit this directly, because [the URL preview endpoint is authenticated](https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url).\n\n### Am I affected?\n\n* deployments with `url_preview_enabled: false` set in configuration are not affected.\n* deployments with `url_preview_enabled: true` set in configuration **are** affected.\n* deployments with no configuration value set for `url_preview_enabled` are not affected, because the default is `false`.\n\n### Patches\n\nAdministrators of homeservers with URL previews enabled are advised to upgrade to v1.61.1 or higher.\n\n### Workarounds\n\n* URL previews can be disabled in the configuration file by setting `url_preview_enabled: false`.\n* Deployments using workers can choose to offload URL previews to one or more dedicated worker(s), ensuring that a process crash does not disrupt other functionality of Synapse.\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).\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "matrix-synapse"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.61.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/synapse/security/advisories/GHSA-22p3-qrh9-cx32"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-31052"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/matrix-org/synapse/commit/fa1308061802ac7b7d20e954ba7372c5ac292333"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/matrix-org/synapse"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2022-224.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD"
  }, {
    "type" : "WEB",
    "url" : "https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-674" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-29T21:51:23Z",
    "nvd_published_at" : "2022-06-28T17:15:00Z"
  }
}

CVSS V3

6.5 HIGH