CVE-2022-39209

Uncontrolled Resource Consumption in cmark-gfm

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print("![l"* 100000 + "
")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.

cmark-gfm es la bifurcación de GitHub de cmark, una biblioteca de análisis y renderización de CommonMark y un programa en C. En versiones anteriores a 0.29.0.gfm.6, un problema de complejidad de tiempo polinómico en la extensión de autolink de cmark-gfm puede conllevar a un agotamiento de recursos sin límites y la consiguiente denegación de servicio. Los usuarios pueden verificar el parche al ejecutar "python3 -c "print("![l "* 100000 + "
")' | ./cmark-gfm -e autolink", que agotará los recursos en cmark-gfm sin parchear, pero será mostrado correctamente en cmark-gfm parcheado. Esta vulnerabilidad ha sido parcheada en versión 0.29.0.gfm.6. Es recomendado a usuarios actualizar. Los usuarios que no puedan actualizares deberán deshabilitar el uso de la extensión autolink

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-09-02 CVE Reserved
2022-09-15 CVE Published
2024-05-06 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-407: Inefficient Algorithmic Complexity

CAPEC

References (6)

URL	Tag	Source
https://en.wikipedia.org/wiki/Time_complexity	Third Party Advisory
https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIUCZN3PEKUCT2JQYQTYOVIJG2KSD6G7	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMGP65NANDVKPDMXMKYO2ZV2H2HZJY4P	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEAAAI4OULDYQ2TA3HOXH54PC3DCBFZS	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Github Search vendor "Github"		Cmark-gfm Search vendor "Github" for product "Cmark-gfm"				< 0.29.0.gfm.6 Search vendor "Github" for product "Cmark-gfm" and version " < 0.29.0.gfm.6"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				36 Search vendor "Fedoraproject" for product "Fedora" and version "36"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				37 Search vendor "Fedoraproject" for product "Fedora" and version "37"		-		Affected