Vulnerability identifier: #VU18922

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
serve-here.js
Web applications / Modules and components for CMS

Vendor: npm Inc.

Description

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

The vulnerability exists due to the package accepts pathname of URLs and adds it to the web root without sanitization. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

PoC:

http://[host]/../../../../etc/passswd

Mitigation
Install updates from vendor's website.

Vulnerable software versions

serve-here.js: 0.0.1 - 1.1.3

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External links
http://github.com/ChristoPy/serve-here.js/commit/cefb51d03290b6a88dd13143ab2de31b8cf57c39
http://hackerone.com/reports/569966

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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. However, proof of concept for this vulnerability is available.