Vulnerability-Lookup

CNVD-2020-58044

Vulnerability from cnvd - Published: 2020-10-22

Title

md4c拒绝服务漏洞（CNVD-2020-58044）

Description

md4c（Markdown for C）是个人开发者的C语言中的Markdown解析器实现。 md4c 0.4.5中的md4c.c中的md_push_block_bytes存在拒绝服务漏洞。攻击者可通过畸形Markdown文档触发使用未初始化的内存，从而可导致拒绝服务。

Severity

中

Patch Name

md4c拒绝服务漏洞（CNVD-2020-58044）的补丁

Patch Description

md4c（Markdown for C）是个人开发者的C语言中的Markdown解析器实现。 md4c 0.4.5中的md4c.c中的md_push_block_bytes存在拒绝服务漏洞。攻击者可通过畸形Markdown文档触发使用未初始化的内存，从而可导致拒绝服务。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/mity/md4c/issues/130

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-26148

Impacted products

Name
md4c md4c 0.4.5

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-26148",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-26148"
    }
  },
  "description": "md4c\uff08Markdown for C\uff09\u662f\u4e2a\u4eba\u5f00\u53d1\u8005\u7684C\u8bed\u8a00\u4e2d\u7684Markdown\u89e3\u6790\u5668\u5b9e\u73b0\u3002\n\nmd4c 0.4.5\u4e2d\u7684md4c.c\u4e2d\u7684md_push_block_bytes\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7578\u5f62Markdown\u6587\u6863\u89e6\u53d1\u4f7f\u7528\u672a\u521d\u59cb\u5316\u7684\u5185\u5b58\uff0c\u4ece\u800c\u53ef\u5bfc\u81f4\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/mity/md4c/issues/130",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-58044",
  "openTime": "2020-10-22",
  "patchDescription": "md4c\uff08Markdown for C\uff09\u662f\u4e2a\u4eba\u5f00\u53d1\u8005\u7684C\u8bed\u8a00\u4e2d\u7684Markdown\u89e3\u6790\u5668\u5b9e\u73b0\u3002\r\n\r\nmd4c 0.4.5\u4e2d\u7684md4c.c\u4e2d\u7684md_push_block_bytes\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7578\u5f62Markdown\u6587\u6863\u89e6\u53d1\u4f7f\u7528\u672a\u521d\u59cb\u5316\u7684\u5185\u5b58\uff0c\u4ece\u800c\u53ef\u5bfc\u81f4\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": "md4c\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2020-58044\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "md4c md4c 0.4.5"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-26148",
  "serverity": "\u4e2d",
  "submitTime": "2020-09-30",
  "title": "md4c\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2020-58044\uff09"
}

CVE-2020-26148 (GCVE-0-2020-26148)

Vulnerability from cvelistv5 – Published: 2020-09-29 18:48 – Updated: 2024-08-04 15:49

Summary

md_push_block_bytes in md4c.c in md4c 0.4.5 allows attackers to trigger use of uninitialized memory, and cause a denial of service (e.g., assertion failure) via a malformed Markdown document.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/mity/md4c/issues/130	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

{
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      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T15:49:07.155Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/mity/md4c/issues/130"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
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          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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          ]
        }
      ],
      "descriptions": [
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          "lang": "en",
          "value": "md_push_block_bytes in md4c.c in md4c 0.4.5 allows attackers to trigger use of uninitialized memory, and cause a denial of service (e.g., assertion failure) via a malformed Markdown document."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-09-29T18:48:41.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/mity/md4c/issues/130"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2020-26148",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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        },
        "problemtype": {
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              "description": [
                {
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                  "value": "n/a"
                }
              ]
            }
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        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/mity/md4c/issues/130",
              "refsource": "MISC",
              "url": "https://github.com/mity/md4c/issues/130"
            }
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        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
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    "datePublished": "2020-09-29T18:48:41.000Z",
    "dateReserved": "2020-09-29T00:00:00.000Z",
    "dateUpdated": "2024-08-04T15:49:07.155Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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.
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CNVD-2020-58044

CVE-2020-26148 (GCVE-0-2020-26148)

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