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GitHub_MCVE-2020-5238

HistoryJul 01, 2020 - 11:15 p.m.

CVE-2020-5238

2020-07-0123:15:10

CWE-20

GitHub_M

web.nvd.nist.gov

github

flavored markdown

table

extension

denial of service

vulnerability

cve-2020-5238

nvd

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

6.1

Confidence

High

EPSS

0.009

Percentile

83.1%

JSON

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.

Affected configurations

Nvd

Vulners

Node

github_flavored_markdown_projectgithub_flavored_markdownRange<0.29.0.gfm.1

Node

fedoraprojectfedoraMatch31

fedoraprojectfedoraMatch32

fedoraprojectfedoraMatch33

VendorProductVersionCPE
github_flavored_markdown_projectgithub_flavored_markdown*cpe:2.3:a:github_flavored_markdown_project:github_flavored_markdown:*:*:*:*:*:*:*:*
fedoraprojectfedora31cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
fedoraprojectfedora32cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
fedoraprojectfedora33cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
github_flavored_markdown_project	github_flavored_markdown	*	cpe:2.3:a:github_flavored_markdown_project:github_flavored_markdown::::::::
fedoraproject	fedora	31	cpe:2.3:o:fedoraproject:fedora:31:::::::*
fedoraproject	fedora	32	cpe:2.3:o:fedoraproject:fedora:32:::::::*
fedoraproject	fedora	33	cpe:2.3:o:fedoraproject:fedora:33:::::::*

CNA Affected

[
  {
    "product": "cmark-gfm",
    "vendor": "github",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.29.0.gfm.1"
      }
    ]
  }
]