GSD-2021-43827

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
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.
Aliases
Aliases
CVE-2021-43827
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{
  "GSD": {
    "alias": "CVE-2021-43827",
    "description": "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.",
    "id": "GSD-2021-43827"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-43827"
      ],
      "details": "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.",
      "id": "GSD-2021-43827",
      "modified": "2023-12-13T01:23:26.695093Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "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"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "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."
          }
        ]
      },
      "impact": {
        "cvss": {
          "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"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-755: Improper Handling of Exceptional Conditions"
              }
            ]
          }
        ]
      },
      "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",
            "url": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-58vr-c56v-qr57",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:discourse:discourse_footnote:*:*:*:*:*:discourse:*:*",
                "cpe_name": [],
                "versionEndExcluding": "0.2",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-43827"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "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."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-755"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab"
            },
            {
              "name": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "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"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2021-12-29T20:31Z",
      "publishedDate": "2021-12-14T23:15Z"
    }
  }
}


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