#VU63700 Incorrect Regular Expression in color-string - CVE-2021-29060

Vulnerability identifier: #VU63700

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-29060

CWE-ID: CWE-185

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
color-string
Web applications / JS libraries

Vendor: Qix

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when the application is provided and checks a crafted invalid HWB string. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

color-string: 0.3.0 - 1.5.5

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External links
https://github.com/yetingli/SaveResults/blob/main/js/color-string.js
https://github.com/yetingli/PoCs/blob/main/CVE-2021-29060/Color-String.md
https://github.com/Qix-/color-string/commit/0789e21284c33d89ebc4ab4ca6f759b9375ac9d3
https://www.npmjs.com/package/color-string

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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.