#VU6904 Directory traversal in BigTree CMS - CVE-2017-9428

Vulnerability identifier: #VU6904

Vulnerability risk: Low

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2017-9428

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BigTree CMS
Web applications / CMS

Vendor: BigTree CMS

Description
The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via "directory" HTTP POST parameter to "/index.php/admin/ajax/developer/extensions/file-browser/" URL. A remote authenticated user with access to administrative area can use directory traversal sequences to view contents of arbitrary files on the system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

BigTree CMS: 4.2 - 4.2.18

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External links
https://github.com/bigtreecms/BigTree-CMS/issues/289

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user 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.