CVE-2019-20922

nodejs-handlebars: an endless loop while processing specially-crafted templates leads to DoS

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Handlebars before 4.4.5 allows Regular Expression Denial of Service (ReDoS) because of eager matching. The parser may be forced into an endless loop while processing crafted templates. This may allow attackers to exhaust system resources.

Handlebars versiones anteriores a 4.4.5, permiten una Denegación de Servicio de Expresión Regular (ReDoS) debido a una búsqueda de coincidencias. El analizador puede verse forzado en un bucle infinito mientras se procesan unas plantillas diseñadas. Esto puede permitir a atacantes agotar los recursos del sistema

A flaw was found in nodejs-handlebars, where affected versions of handlebars are vulnerable to a denial of service. The package's parser may be forced into an endless loop while processing specially-crafted templates. This flaw allows attackers to exhaust system resources, leading to a denial of service.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-09-30 CVE Reserved
2020-09-30 CVE Published
2023-06-16 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (5)

URL	Tag	Source
https://snyk.io/vuln/SNYK-JS-HANDLEBARS-480388	Third Party Advisory
https://www.npmjs.com/advisories/1300	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/handlebars-lang/handlebars.js/commit/8d5530ee2c3ea9f0aee3fde310b9f36887d00b8b	2021-07-21

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2019-20922	2023-03-20
https://bugzilla.redhat.com/show_bug.cgi?id=1882256	2023-03-20

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Handlebarsjs Search vendor "Handlebarsjs"		Handlebars Search vendor "Handlebarsjs" for product "Handlebars"				>= 4.0.0 < 4.4.5 Search vendor "Handlebarsjs" for product "Handlebars" and version " >= 4.0.0 < 4.4.5"		node.js		Affected