Vulnerability-Lookup

CNVD-2021-20205

Vulnerability from cnvd - Published: 2021-03-22

Title

GitHub Flavored Markdown输入验证错误漏洞

Description

GitHub Flavored Markdown是美国GitHub公司的一款使用在C语言中的CommonMark解析和渲染库。 GitHub Flavored Markdown 0.29.0.gfm.1之前版本中存在输入验证错误漏洞。该漏洞源于网络系统或产品未对输入的数据进行正确的验证。攻击者可利用该漏洞造成拒绝服务。

Severity

中

Patch Name

GitHub Flavored Markdown输入验证错误漏洞的补丁

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/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-5238

Impacted products

Name
github Flavored Markdown <0.29.0.gfm.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-5238"
    }
  },
  "description": "GitHub Flavored Markdown\u662f\u7f8e\u56fdGitHub\u516c\u53f8\u7684\u4e00\u6b3e\u4f7f\u7528\u5728C\u8bed\u8a00\u4e2d\u7684CommonMark\u89e3\u6790\u548c\u6e32\u67d3\u5e93\u3002\n\nGitHub Flavored Markdown 0.29.0.gfm.1\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7f51\u7edc\u7cfb\u7edf\u6216\u4ea7\u54c1\u672a\u5bf9\u8f93\u5165\u7684\u6570\u636e\u8fdb\u884c\u6b63\u786e\u7684\u9a8c\u8bc1\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\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/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-20205",
  "openTime": "2021-03-22",
  "patchDescription": "GitHub Flavored Markdown\u662f\u7f8e\u56fdGitHub\u516c\u53f8\u7684\u4e00\u6b3e\u4f7f\u7528\u5728C\u8bed\u8a00\u4e2d\u7684CommonMark\u89e3\u6790\u548c\u6e32\u67d3\u5e93\u3002\r\n\r\nGitHub Flavored Markdown 0.29.0.gfm.1\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7f51\u7edc\u7cfb\u7edf\u6216\u4ea7\u54c1\u672a\u5bf9\u8f93\u5165\u7684\u6570\u636e\u8fdb\u884c\u6b63\u786e\u7684\u9a8c\u8bc1\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\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": "GitHub Flavored Markdown\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "github Flavored Markdown \u003c0.29.0.gfm.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-5238",
  "serverity": "\u4e2d",
  "submitTime": "2020-07-02",
  "title": "GitHub Flavored Markdown\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2020-5238 (GCVE-0-2020-5238)

Vulnerability from cvelistv5 – Published: 2020-07-01 23:05 – Updated: 2024-08-04 08:22

Title

Denial of service in table parsing in cmark-gfm

Summary

The table extension in GitHub Flavored Markdown before version 0.29.0.gfm.1 takes O(n * n) time to parse certain inputs. An attacker could craft a markdown table which would take an unreasonably long time to process, causing a denial of service. This issue does not affect the upstream cmark project. The issue has been fixed in version 0.29.0.gfm.1.

Severity

6.5 (Medium)


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

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/github/cmark-gfm/security/advi…	x_refsource_CONFIRM
https://github.com/github/cmark-gfm/commit/85d895…	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
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
github	cmark-gfm	Affected: < 0.29.0.gfm.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T08:22:09.078Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4"
          },
          {
            "name": "FEDORA-2020-c39d7a562c",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TCDHBTUFIOYRIS5HAS6PZNBNMB7IOAX3/"
          },
          {
            "name": "FEDORA-2020-1eaffe0013",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGJH2A4VAV54X6NSCNNGSEIGIIY5N2VR/"
          },
          {
            "name": "FEDORA-2020-fe299b3fa3",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMQFOQQCWOAMQ4I2XIVCVOXXIJ75HDCW/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "cmark-gfm",
          "vendor": "github",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.29.0.gfm.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The table extension in GitHub Flavored Markdown before version 0.29.0.gfm.1 takes O(n * n) time to parse certain inputs. An attacker could craft a markdown table which would take an unreasonably long time to process, causing a denial of service. This issue does not affect the upstream cmark project. The issue has been fixed in version 0.29.0.gfm.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "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:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-10-06T16:06:16.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4"
        },
        {
          "name": "FEDORA-2020-c39d7a562c",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TCDHBTUFIOYRIS5HAS6PZNBNMB7IOAX3/"
        },
        {
          "name": "FEDORA-2020-1eaffe0013",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGJH2A4VAV54X6NSCNNGSEIGIIY5N2VR/"
        },
        {
          "name": "FEDORA-2020-fe299b3fa3",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMQFOQQCWOAMQ4I2XIVCVOXXIJ75HDCW/"
        }
      ],
      "source": {
        "advisory": "GHSA-7gc6-9qr5-hc85",
        "discovery": "UNKNOWN"
      },
      "title": "Denial of service in table parsing in cmark-gfm",
      "x_legacyV4Record": {
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          "ID": "CVE-2020-5238",
          "STATE": "PUBLIC",
          "TITLE": "Denial of service in table parsing in cmark-gfm"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "cmark-gfm",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 0.29.0.gfm.1"
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            }
          ]
        },
        "impact": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
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              "url": "https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4"
            },
            {
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              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TCDHBTUFIOYRIS5HAS6PZNBNMB7IOAX3/"
            },
            {
              "name": "FEDORA-2020-1eaffe0013",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZGJH2A4VAV54X6NSCNNGSEIGIIY5N2VR/"
            },
            {
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  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-5238",
    "datePublished": "2020-07-01T23:05:15.000Z",
    "dateReserved": "2020-01-02T00:00:00.000Z",
    "dateUpdated": "2024-08-04T08:22:09.078Z",
    "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.

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.

Action not permitted

CNVD-2021-20205

CVE-2020-5238 (GCVE-0-2020-5238)

Tags

Sightings

Nomenclature

Related by attack behaviour