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GoogleOSV:RSEC-2023-7

HistoryOct 06, 2023 - 5:00 a.m.

Denial of Service (DoS) and Arbitrary Code Execution (ACE) vulnerabilities

2023-10-0605:00:00

Google

osv.dev

cmark-gfm

denial of service

arbitrary code execution

autolink extension

integer overflow

heap corruption

software vulnerabilities

patches

mitigations

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

8.2

Confidence

High

EPSS

0.065

Percentile

93.7%

JSON

cmark-gfm, GitHub’s extended CommonMark library, has multiple vulnerabilities. Versions prior to 0.29.0.gfm.6 suffer from a polynomial time complexity issue in the autolink extension, causing denial of service. Also, versions before 0.29.0.gfm.3 and 0.28.3.gfm.21 contain an integer overflow in table row parsing, leading to heap corruption and potential Arbitrary Code Execution. Patches are available in versions 0.29.0.gfm.6, 0.29.0.gfm.3, and 0.28.3.gfm.21. Mitigations include upgrading or disabling affected extensions.