Vulnerability-Lookup

CNVD-2022-05508

Vulnerability from cnvd - Published: 2022-01-20

Title

Discourse存在未明漏洞（CNVD-2022-05508）

Description

Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 discourse-footnote存在安全漏洞，攻击者可利用该漏洞触发空引用javascript错误。

Severity

中

Patch Name

Discourse存在未明漏洞（CNVD-2022-05508）的补丁

Patch Description

Discourse是一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 discourse-footnote存在安全漏洞，攻击者可利用该漏洞触发空引用javascript错误。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

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-43827

Impacted products

Name
Discourse discourse-footnote <0.2

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-43827"
    }
  },
  "description": "Discourse\u662f\u4e00\u5957\u5f00\u6e90\u7684\u793e\u533a\u8ba8\u8bba\u5e73\u53f0\u3002\u8be5\u5e73\u53f0\u5305\u62ec\u793e\u533a\u3001\u7535\u5b50\u90ae\u4ef6\u548c\u804a\u5929\u5ba4\u7b49\u529f\u80fd\u3002\n\ndiscourse-footnote\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u89e6\u53d1\u7a7a\u5f15\u7528javascript\u9519\u8bef\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2022-05508",
  "openTime": "2022-01-20",
  "patchDescription": "Discourse\u662f\u4e00\u5957\u5f00\u6e90\u7684\u793e\u533a\u8ba8\u8bba\u5e73\u53f0\u3002\u8be5\u5e73\u53f0\u5305\u62ec\u793e\u533a\u3001\u7535\u5b50\u90ae\u4ef6\u548c\u804a\u5929\u5ba4\u7b49\u529f\u80fd\u3002\r\n\r\ndiscourse-footnote\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u89e6\u53d1\u7a7a\u5f15\u7528javascript\u9519\u8bef\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": "Discourse\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2022-05508\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Discourse discourse-footnote \u003c0.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-43827",
  "serverity": "\u4e2d",
  "submitTime": "2021-12-16",
  "title": "Discourse\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2022-05508\uff09"
}

CVE-2021-43827 (GCVE-0-2021-43827)

Vulnerability from cvelistv5 – Published: 2021-12-14 22:20 – Updated: 2024-08-04 04:03

Title

Inline footnotes wrapped in <a> tags can cause errors in discourse-footnotes

Summary

discourse-footnote is a library providing footnotes for posts in Discourse. ### Impact When posting an inline footnote wrapped in `<a>` tags (e.g. `<a>^[footnote]</a>`, the resulting rendered HTML would include a nested `<a>`, which is stripped by Nokogiri because it is not valid. This then caused a javascript error on topic pages because we were looking for an `<a>` element inside the footnote reference span and getting its ID, and because it did not exist we got a null reference error in javascript. Users are advised to update to version 0.2. As a workaround editing offending posts from the rails console or the database console for self-hosters, or disabling the plugin in the admin panel can mitigate this issue.

Severity

4.3 (Medium)


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

CWE

CWE-755 - Improper Handling of Exceptional Conditions

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/discourse/discourse-footnote/s…	x_refsource_CONFIRM
https://github.com/discourse/discourse-footnote/c…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
discourse	discourse-footnote	Affected: < 0.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T04:03:08.963Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "discourse-footnote",
          "vendor": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "discourse-footnote is a library providing footnotes for posts in Discourse. ### Impact When posting an inline footnote wrapped in `\u003ca\u003e` tags (e.g. `\u003ca\u003e^[footnote]\u003c/a\u003e`, the resulting rendered HTML would include a nested `\u003ca\u003e`, which is stripped by Nokogiri because it is not valid. This then caused a javascript error on topic pages because we were looking for an `\u003ca\u003e` element inside the footnote reference span and getting its ID, and because it did not exist we got a null reference error in javascript. Users are advised to update to version 0.2. As a workaround editing offending posts from the rails console or the database console for self-hosters, or disabling the plugin in the admin panel can mitigate this issue."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-755",
              "description": "CWE-755: Improper Handling of Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2021-12-14T22:20:09.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab"
        }
      ],
      "source": {
        "advisory": "GHSA-58vr-c56v-qr57",
        "discovery": "UNKNOWN"
      },
      "title": "Inline footnotes wrapped in \u003ca\u003e tags can cause errors in discourse-footnotes",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-43827",
          "STATE": "PUBLIC",
          "TITLE": "Inline footnotes wrapped in \u003ca\u003e tags can cause errors in discourse-footnotes"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "discourse-footnote",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 0.2"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "discourse"
              }
            ]
          }
        },
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        "data_version": "4.0",
        "description": {
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        },
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            "privilegesRequired": "LOW",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
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                  "value": "CWE-755: Improper Handling of Exceptional Conditions"
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              ]
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          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57",
              "refsource": "CONFIRM",
              "url": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57"
            },
            {
              "name": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab",
              "refsource": "MISC",
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    "assignerShortName": "GitHub_M",
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    "datePublished": "2021-12-14T22:20:09.000Z",
    "dateReserved": "2021-11-16T00:00:00.000Z",
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    "state": "PUBLISHED"
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  "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.

Detection rules are retrieved from Rulezet.

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.