Vulnerability identifier: #VU25723

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5188

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
DotNetNuke
Web applications / CMS

Vendor: DNN

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insecure permissions issue. A remote authenticated attacker can bypass the client-side validation and upload files with extensions which are allowed only for superuser only.

Mitigation
Install update from vendor's website.

Vulnerable software versions

DotNetNuke: 9.0.0 - 9.4.4

---

External links
http://packetstormsecurity.com/files/156484/DotNetNuke-CMS-9.5.0-File-Extension-Check-Bypass.html
http://github.com/dnnsoftware/Dnn.Platform/releases
http://medium.com/@SajjadPourali/dnn-dotnetnuke-cms-not-as-secure-as-you-think-e8516f789175

---

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.