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CVE-2020-5238— Denial of service in table parsing in cmark-gfm

Quick assessment

Affected
github cmark-gfm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.5 · Medium EPSS 1.57% · P75

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-5238

Vulnerability Information
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Vulnerability Title
Denial of service in table parsing in cmark-gfm
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Flavored Markdown 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability 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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
github cmark-gfm < 0.29.0.gfm.1 -

II. Public POCs for CVE-2020-5238

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III. Intelligence Information for CVE-2020-5238

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Patches & Fixes for CVE-2020-5238 (1)

Vendor Advisories for CVE-2020-5238 (1)

Mailing List Discussions for CVE-2020-5238 (3)

IV. Related Vulnerabilities

Same product: cmark-gfm
Same vendor: github
Same weakness: CWE-20

V. Comments for CVE-2020-5238

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