Cross-site scripting in PortlandLabs concrete5

1) Cross-site scripting

EUVDB-ID: #VU35826

Risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-19146

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The vulnerability allows a remote privileged user to read and manipulate data.

Concrete5 8.4.3 has XSS because config/concrete.php allows uploads (by administrators) of SVG files that may contain HTML data with a SCRIPT element.

Mitigation

Install update from vendor's website.

Vulnerable software versions

concrete5: 8.4.3

External links

http://hackerone.com/concrete5?view_policy=true
http://hackerone.com/reports/437863
http://www.concrete5.org/
http://www.w3.org/TR/SVG2/intro.html#W3CCompatibility

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.