Vulnerability-Lookup

FKIE_CVE-2022-39254

Vulnerability from fkie_nvd - Published: 2022-09-29 15:15 - Updated: 2026-06-17 04:58

Severity

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

Summary

matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.

References

URL	Tags
security-advisories@github.com	https://github.com/poljar/matrix-nio/commit/b1cbf234a831daa160673defd596e6450e9c29f0	Patch, Third Party Advisory
security-advisories@github.com	https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/poljar/matrix-nio/commit/b1cbf234a831daa160673defd596e6450e9c29f0	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh	Third Party Advisory

Impacted products

	Vendor	Product	Version
	matrix-nio_project	matrix-nio	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "matrix-nio",
          "vendor": "poljar",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.20"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:matrix-nio_project:matrix-nio:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "506DDAC5-7A26-4D1C-A74A-A49F6CD49F31",
              "versionEndExcluding": "0.20",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue."
    },
    {
      "lang": "es",
      "value": "matrix-nio es una librer\u00eda cliente de Matrix en Python, dise\u00f1ada seg\u00fan los principios de sans I/O. En versiones anteriores a 0.20, cuando los usuarios solicitaban una llave de habitaci\u00f3n desde sus dispositivos, el software recordaba correctamente la petici\u00f3n. Una vez que reciben una llave de habitaci\u00f3n reenviada, la aceptan sin comprobar de qui\u00e9n procede la llave de habitaci\u00f3n. Esto permite que los servidores dom\u00e9sticos intenten introducir llaves de habitaci\u00f3n de dudosa validez, montando potencialmente un ataque de suplantaci\u00f3n de identidad. La versi\u00f3n 0.20 corrige el problema"
    }
  ],
  "id": "CVE-2022-39254",
  "lastModified": "2026-06-17T04:58:00.400",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-39254",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-04-23T15:50:24.477414Z",
          "version": "2.0.3"
        }
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  },
  "published": "2022-09-29T15:15:10.513",
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      "source": "security-advisories@github.com",
      "tags": [
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      ],
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    },
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      "source": "security-advisories@github.com",
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      "url": "https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh"
    },
    {
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        "Third Party Advisory"
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/poljar/matrix-nio/security/advisories/GHSA-w4pr-4vjg-hffh"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        },
        {
          "lang": "en",
          "value": "CWE-322"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2022-39254 (GCVE-0-2022-39254)

Vulnerability from cvelistv5 – Published: 2022-09-29 14:35 – Updated: 2025-04-23 16:53

Title

When matrix-nio receives forwarded room keys, the receiver doesn't check if it requested the key from the forwarder

Summary

Severity

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-23 15:50 UTC

CWE

CWE-322 - Key Exchange without Entity Authentication
CWE-287 - Improper Authentication

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7712 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/poljar/matrix-nio/security/adv…	x_refsource_CONFIRM
https://github.com/poljar/matrix-nio/commit/b1cbf…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
poljar	matrix-nio	Affected: < 0.20

Show details on NVD website

JSON

To clipboard

{
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          "dateUpdated": "2024-08-03T12:00:43.472Z",
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        ],
        "title": "CVE Program Container"
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        "metrics": [
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        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
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      ],
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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