#VU55264 Prototype pollution in handlebars.js - CVE-2019-19919

Vulnerability identifier: #VU55264

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-19919

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
handlebars.js
Web applications / JS libraries

Vendor: The Handlebars Templating Language

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.

Mitigation
Install update from vendor's website.

Vulnerable software versions

handlebars.js: 1.0.0 - 4.2.2

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External links
https://www.npmjs.com/advisories/1164

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.