Regular expression denial of service in validator.js

1) Incorrect Regular Expression

EUVDB-ID: #VU68281

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3765

CWE-ID: CWE-185 - Incorrect Regular Expression

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a regular expression denial of service (ReDoS) attack.

The vulnerability exists due to improper input validation when handling user-supplied input. A remote attacker can pass specially crafted data to the application and perform a regular expression denial of service (ReDoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

validator.js: 0.5.0 - 13.6.1

CPE2.3

• cpe:2.3:a:validatorjs:validator.js:0.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:validatorjs:validator.js:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:validatorjs:validator.js:1.1.0:*:*:*:*:*:*:*

External links

https://huntr.dev/bounties/c37e975c-21a3-4c5f-9b57-04d63b28cfc9
https://github.com/validatorjs/validator.js/commit/496fc8b2a7f5997acaaec33cc44d0b8dba5fb5e1

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.