Vulnerability-Lookup

CNVD-2021-91275

Vulnerability from cnvd - Published: 2021-11-25

Title

Synapse路径遍历漏洞

Description

Synapse是一个应用程序。用于开放式联合即时消息和VoIPSynapse。 Synapse 1.47.1之前版本存在路径遍历漏洞，攻击者可利用该漏洞绕过身份验证过程，从远程服务器下载文件到任意目录中。

Severity

高

Patch Name

Synapse路径遍历漏洞的补丁

Patch Description

Synapse是一个应用程序。用于开放式联合即时消息和VoIPSynapse。 Synapse 1.47.1之前版本存在路径遍历漏洞，攻击者可利用该漏洞绕过身份验证过程，从远程服务器下载文件到任意目录中。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-41281

Impacted products

Name
Synapse synapse <1.47.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-41281",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-41281"
    }
  },
  "description": "Synapse\u662f\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u3002\u7528\u4e8e\u5f00\u653e\u5f0f\u8054\u5408\u5373\u65f6\u6d88\u606f\u548cVoIPSynapse\u3002\n\nSynapse 1.47.1\u4e4b\u524d\u7248\u672c\u5b58\u5728\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u8fc7\u7a0b\uff0c\u4ece\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0b\u8f7d\u6587\u4ef6\u5230\u4efb\u610f\u76ee\u5f55\u4e2d\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-91275",
  "openTime": "2021-11-25",
  "patchDescription": "Synapse\u662f\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u3002\u7528\u4e8e\u5f00\u653e\u5f0f\u8054\u5408\u5373\u65f6\u6d88\u606f\u548cVoIPSynapse\u3002\r\n\r\nSynapse 1.47.1\u4e4b\u524d\u7248\u672c\u5b58\u5728\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u8fc7\u7a0b\uff0c\u4ece\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0b\u8f7d\u6587\u4ef6\u5230\u4efb\u610f\u76ee\u5f55\u4e2d\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Synapse\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Synapse synapse \u003c1.47.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-41281",
  "serverity": "\u9ad8",
  "submitTime": "2021-11-25",
  "title": "Synapse\u8def\u5f84\u904d\u5386\u6f0f\u6d1e"
}

CVE-2021-41281 (GCVE-0-2021-41281)

Vulnerability from cvelistv5 – Published: 2021-11-23 19:15 – Updated: 2024-08-04 03:08

Title

Path traversal in Matrix Synapse

Summary

Synapse is a package for Matrix homeservers written in Python 3/Twisted. Prior to version 1.47.1, Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory. No authentication is required for the affected endpoint. The last 2 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 with a federation whitelist are also unaffected, since Synapse will check the remote hostname, including the trailing `../`s, against the whitelist. Server administrators should upgrade to 1.47.1 or later. Server administrators using a reverse proxy could, at the expense of losing media functionality, may block the certain endpoints as a workaround. Alternatively, non-containerized deployments can be adapted to use the hardened systemd config.

Severity

7.5 (High)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/matrix-org/synapse/security/ad…	x_refsource_CONFIRM
https://github.com/matrix-org/synapse/commit/91f2bd090	x_refsource_MISC
https://github.com/matrix-org/synapse/releases/ta…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
matrix-org	synapse	Affected: < 1.47.1

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T03:08:31.942Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/commit/91f2bd090"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/releases/tag/v1.47.1"
          },
          {
            "name": "FEDORA-2021-2f9dcdbace",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N3WY56LCEZ4ZECLWV5KMAXF2PSMUB4F2/"
          },
          {
            "name": "FEDORA-2021-9758549fce",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EU7QRE55U4IUEDLKT5IYPWL3UXMELFAS/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "synapse",
          "vendor": "matrix-org",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.47.1"
            }
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        }
      ],
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        {
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-22",
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            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2021-12-09T02:06:11.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/matrix-org/synapse/commit/91f2bd090"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/matrix-org/synapse/releases/tag/v1.47.1"
        },
        {
          "name": "FEDORA-2021-2f9dcdbace",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N3WY56LCEZ4ZECLWV5KMAXF2PSMUB4F2/"
        },
        {
          "name": "FEDORA-2021-9758549fce",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EU7QRE55U4IUEDLKT5IYPWL3UXMELFAS/"
        }
      ],
      "source": {
        "advisory": "GHSA-3hfw-x7gx-437c",
        "discovery": "UNKNOWN"
      },
      "title": "Path traversal in Matrix Synapse",
      "x_legacyV4Record": {
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          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-41281",
          "STATE": "PUBLIC",
          "TITLE": "Path traversal in Matrix Synapse"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "synapse",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 1.47.1"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "matrix-org"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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              "value": "Synapse is a package for Matrix homeservers written in Python 3/Twisted. Prior to version 1.47.1, Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory. No authentication is required for the affected endpoint. The last 2 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 with a federation whitelist are also unaffected, since Synapse will check the remote hostname, including the trailing `../`s, against the whitelist. Server administrators should upgrade to 1.47.1 or later. Server administrators using a reverse proxy could, at the expense of losing media functionality, may block the certain endpoints as a workaround. Alternatively, non-containerized deployments can be adapted to use the hardened systemd config."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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                  "lang": "eng",
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            {
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            },
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              "refsource": "MISC",
              "url": "https://github.com/matrix-org/synapse/commit/91f2bd090"
            },
            {
              "name": "https://github.com/matrix-org/synapse/releases/tag/v1.47.1",
              "refsource": "MISC",
              "url": "https://github.com/matrix-org/synapse/releases/tag/v1.47.1"
            },
            {
              "name": "FEDORA-2021-2f9dcdbace",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N3WY56LCEZ4ZECLWV5KMAXF2PSMUB4F2/"
            },
            {
              "name": "FEDORA-2021-9758549fce",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EU7QRE55U4IUEDLKT5IYPWL3UXMELFAS/"
            }
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  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-41281",
    "datePublished": "2021-11-23T19:15:18.000Z",
    "dateReserved": "2021-09-15T00:00:00.000Z",
    "dateUpdated": "2024-08-04T03:08:31.942Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

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.

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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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CNVD-2021-91275

CVE-2021-41281 (GCVE-0-2021-41281)

Tags

Sightings

Nomenclature

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