Dangerous file upload in Backdrop CMS



Published: 2019-03-20 | Updated: 2019-05-29
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-6341
CWE ID CWE-434
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Backdrop CMS
Web applications / CMS

Vendor Backdrop CMS

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Dangerous file upload

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-6341

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the File module/subsystem in file.inc component. A remote authenticated attacker can upload a file with JavaScript code inside and execute it in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Update Backdrop Core to version 1.12.5 or 1.11.8.

Vulnerable software versions

Backdrop CMS: 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.11.5, 1.11.6, 1.11.7, 1.12.0, 1.12.1, 1.12.2, 1.12.3, 1.12.4

CPE External links

https://backdropcms.org/security/backdrop-sa-core-2019-008

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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



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