Path traversal in CivetWeb

1) Path traversal

EUVDB-ID: #VU61251

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-27304

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

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 within the mg_handle_form_request API. A remote attacker can send a specially crafted HTTP request and upload arbitrary files on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

CivetWeb: 1.8 - 1.14

CPE2.3

• cpe:2.3:a:civetweb:civetweb:1.8:*:*:*:*:*:*:*
• cpe:2.3:a:civetweb:civetweb:1.9:*:*:*:*:*:*:*
• cpe:2.3:a:civetweb:civetweb:1.9.1:*:*:*:*:*:*:*

External links

https://jfrog.com/blog/cve-2020-27304-rce-via-directory-traversal-in-civetweb-http-server/
https://groups.google.com/g/civetweb/c/yPBxNXdGgJQ

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.