#VU57967 Input validation error in serve - CVE-2021-3807

Vulnerability identifier: #VU57967

Vulnerability 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-2021-3807

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
serve
Web applications / JS libraries

Vendor: Zeit

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when matching crafted invalid ANSI escape codes in ansi-regex. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

serve: 10.0.0 - 13.0.0

---

External links
https://github.com/chalk/ansi-regex/commit/8d1d7cdb586269882c4bdc1b7325d0c58c8f76f9
https://huntr.dev/bounties/5b3cf33b-ede0-4398-9974-800876dfd994
https://github.com/zeit/serve/releases/tag/13.0.1

---

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.