Vulnerability identifier: #VU27919

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5577

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Movable Type
Web applications / CMS
Movable Type Advanced
Web applications / CMS
Movable Type for AWS
Web applications / CMS
Movable Type Premium
Web applications / CMS
Movable Type Premium Advanced
Web applications / CMS

Vendor: Six Apart Ltd

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload. A remote authenticated attacker can upload a malicious file and execute it on the server.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Movable Type: 6.3 - 7.2.1

Movable Type Advanced: 6.3 - 7.2.1

Movable Type for AWS: 7.0.1 - 7.2.1

Movable Type Premium: 1.29

Movable Type Premium Advanced: 1.29

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External links
http://jvn.jp/en/jp/JVN28806943/index.html
http://movabletype.org/news/2020/05/mt-730-660-6312-released.html

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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.