#VU26476 Path traversal in Next.js - CVE-2020-5284

Vulnerability identifier: #VU26476

Vulnerability risk: Medium

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

CVE-ID: CVE-2020-5284

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Next.js
Server applications / Frameworks for developing and running applications

Vendor: Zeit

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Next.js: 1.0.0 - 1.0.2, 1.1.0 - 1.1.2, 1.2.0 - 1.2.3, 2.0.0 - 2.0.1, 2.1.0 - 2.1.1, 2.2.0, 2.3.0 - 2.3.2, 2.4.0 - 2.4.9, 3.0.1 - 3.0.6, 3.1.0, 3.2.0 - 3.2.3, 4.0.0 - 4.0.5, 4.1.0 - 4.1.4, 4.2.0 - 4.2.3, 5.0.0, 5.1.0, 6.0.0 - 6.0.3, 6.1.0 - 6.1.2, 7.0.0 - 7.0.3, 8.0.0 - 8.0.4, 8.1.0, 9.0.0 - 9.0.8, 9.1.0 - 9.1.7, 9.2.0 - 9.2.2, 9.3.0 - 9.3.1

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External links
https://github.com/zeit/next.js/releases/tag/v9.3.2
https://github.com/zeit/next.js/security/advisories/GHSA-fq77-7p7r-83rj
https://github.com/vercel/next.js/security/advisories/GHSA-fq77-7p7r-83rj

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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.