#VU30829 Input validation error in Backdrop CMS - CVE-2019-14771

Vulnerability identifier: #VU30829

Vulnerability 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-2019-14771

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 non-authenticated attacker to execute arbitrary code.

Backdrop CMS 1.12.x before 1.12.8 and 1.13.x before 1.13.3 allows the upload of entire-site configuration archives through the user interface or command line. It does not sufficiently check uploaded archives for invalid data, potentially allowing non-configuration scripts to be uploaded to the server. (This attack is mitigated by the attacker needing the "Synchronize, import, and export configuration" permission, a permission that only trusted administrators should be given. Other preventative measures in Backdrop CMS prevent the execution of PHP scripts, so another server-side scripting language must be accessible on the server to execute code.)

Mitigation
Install update from vendor's website.

Vulnerable software versions

Backdrop CMS: 1.13.0 - 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 non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.