Vulnerability-Lookup

CNVD-2021-08894

Vulnerability from cnvd - Published: 2021-02-03

Title

Hedgedoc跨站脚本漏洞

Description

Hedgedoc是Hedgedoc团队的一个基于Javascript的Markdown文档实时编辑分享平台。 HedgeDoc 1.7.1之前版本存在安全漏洞，攻击者可利用该漏洞可以在HedgeDoc notes中注入任意的“脚本”标签。我们的内容安全策略禁止从大多数位置加载脚本，但“www.google-analytics.com”是允许的。使用谷歌标签管理器可以注入任意JavaScript并在页面加载时执行它。

Severity

中

Patch Name

Hedgedoc跨站脚本漏洞的补丁

Patch Description

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/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-26287

Impacted products

Name
Hedgedoc HedgeDoc <1.7.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-26287",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-26287"
    }
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  "description": "Hedgedoc\u662fHedgedoc\u56e2\u961f\u7684\u4e00\u4e2a\u57fa\u4e8eJavascript\u7684Markdown\u6587\u6863\u5b9e\u65f6\u7f16\u8f91\u5206\u4eab\u5e73\u53f0\u3002\n\nHedgeDoc 1.7.1\u4e4b\u524d\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u4ee5\u5728HedgeDoc notes\u4e2d\u6ce8\u5165\u4efb\u610f\u7684\u201c\u811a\u672c\u201d\u6807\u7b7e\u3002\u6211\u4eec\u7684\u5185\u5bb9\u5b89\u5168\u7b56\u7565\u7981\u6b62\u4ece\u5927\u591a\u6570\u4f4d\u7f6e\u52a0\u8f7d\u811a\u672c\uff0c\u4f46\u201cwww.google-analytics.com\u201d\u662f\u5141\u8bb8\u7684\u3002\u4f7f\u7528\u8c37\u6b4c\u6807\u7b7e\u7ba1\u7406\u5668\u53ef\u4ee5\u6ce8\u5165\u4efb\u610fJavaScript\u5e76\u5728\u9875\u9762\u52a0\u8f7d\u65f6\u6267\u884c\u5b83\u3002",
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  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-08894",
  "openTime": "2021-02-03",
  "patchDescription": "Hedgedoc\u662fHedgedoc\u56e2\u961f\u7684\u4e00\u4e2a\u57fa\u4e8eJavascript\u7684Markdown\u6587\u6863\u5b9e\u65f6\u7f16\u8f91\u5206\u4eab\u5e73\u53f0\u3002\r\n\r\nHedgeDoc 1.7.1\u4e4b\u524d\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ef\u4ee5\u5728HedgeDoc notes\u4e2d\u6ce8\u5165\u4efb\u610f\u7684\u201c\u811a\u672c\u201d\u6807\u7b7e\u3002\u6211\u4eec\u7684\u5185\u5bb9\u5b89\u5168\u7b56\u7565\u7981\u6b62\u4ece\u5927\u591a\u6570\u4f4d\u7f6e\u52a0\u8f7d\u811a\u672c\uff0c\u4f46\u201cwww.google-analytics.com\u201d\u662f\u5141\u8bb8\u7684\u3002\u4f7f\u7528\u8c37\u6b4c\u6807\u7b7e\u7ba1\u7406\u5668\u53ef\u4ee5\u6ce8\u5165\u4efb\u610fJavaScript\u5e76\u5728\u9875\u9762\u52a0\u8f7d\u65f6\u6267\u884c\u5b83\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": "Hedgedoc\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Hedgedoc HedgeDoc \u003c1.7.1"
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  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-26287",
  "serverity": "\u4e2d",
  "submitTime": "2020-12-30",
  "title": "Hedgedoc\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e"
}

CVE-2020-26287 (GCVE-0-2020-26287)

Vulnerability from cvelistv5 – Published: 2020-12-28 23:30 – Updated: 2024-08-04 15:56

Title

Stored XSS in mermaid diagrams

Summary

HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist.

Severity

8.7 (High)


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

CWE

CWE-79 - Cross-site Scripting (XSS)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7836 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1	x_refsource_MISC
https://github.com/hedgedoc/hedgedoc/security/adv…	x_refsource_CONFIRM
https://github.com/hackmdio/codimd/issues/1630	x_refsource_MISC
https://github.com/Alemmi/ctf-writeups/blob/main/…	x_refsource_MISC
https://github.com/hedgedoc/hedgedoc/commit/58276…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
hedgedoc	hedgedoc	Affected: < 1.7.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T15:56:03.991Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p"
          },
          {
            "tags": [
              "x_refsource_MISC",
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            "url": "https://github.com/hackmdio/codimd/issues/1630"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "hedgedoc",
          "vendor": "hedgedoc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.7.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
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            "version": "3.1"
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        {
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              "description": "CWE-79 Cross-site Scripting (XSS)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-12-28T23:30:17.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"
        },
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          "tags": [
            "x_refsource_CONFIRM"
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        },
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          "url": "https://github.com/hackmdio/codimd/issues/1630"
        },
        {
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          ],
          "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"
        }
      ],
      "source": {
        "advisory": "GHSA-g6w6-7xf9-m95p",
        "discovery": "UNKNOWN"
      },
      "title": "Stored XSS in mermaid diagrams",
      "x_legacyV4Record": {
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          "STATE": "PUBLIC",
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        },
        "affects": {
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              {
                "product": {
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                    {
                      "product_name": "hedgedoc",
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                            "version_value": "\u003c 1.7.1"
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            }
          ]
        },
        "impact": {
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            "attackVector": "NETWORK",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        },
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                  "lang": "eng",
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            },
            {
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            },
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              "refsource": "MISC",
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            },
            {
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            },
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            }
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          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-26287",
    "datePublished": "2020-12-28T23:30:17.000Z",
    "dateReserved": "2020-10-01T00:00:00.000Z",
    "dateUpdated": "2024-08-04T15:56:03.991Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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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