Vulnerability identifier: #VU28219

Vulnerability risk: High

CVSSv3.1: 9.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2020-13166

CWE-ID: CWE-798

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
MyLittleAdmin
Server applications / Remote management servers, RDP, SSH

Vendor: myLittleTools

Description

The vulnerability allows a remote attacker to gain full access to vulnerable system.

The vulnerability exists due to presence of hard-coded "machineKey" in web.config. A remote unauthenticated attacker can serialize objects that will be parsed by the ASP code used by the server as if it were MyLittleAdmin’s serialized object and execute arbitrary code on the remote server.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

MyLittleAdmin: 3.8 r0071

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External links
http://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html
http://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/
http://portswigger.net/daily-swig/mylittleadmin-has-a-big-unpatched-security-flaw

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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. However, proof of concept for this vulnerability is available.