#VU19980 Input validation error in Backdrop CMS

Vulnerability identifier: #VU19980

Vulnerability risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Backdrop CMS
Web applications / CMS

Vendor: Backdrop CMS

Description

The vulnerability allows a remote attacker to compromise vulnerable website.

The vulnerability exists due to insufficient validation of the uploaded files. A remote privileged attacker can upload and execute arbitrary PHP code on the server.

Successful exploitation of the vulnerability requires "Synchronize, import, and export configuration" permissions. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Backdrop CMS: 1.12.0 - 1.13.2

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External links
https://backdropcms.org/security/backdrop-sa-core-2019-012

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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.