#VU27916 Improper Neutralization of Special Elements in Output Used by a Downstream Component in Six Apart Ltd products - CVE-2020-5574

Vulnerability identifier: #VU27916

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-5574

CWE-ID: CWE-74

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 perform cache poisoning attack.

The vulnerability exists due to improper input validation of HTML code. A remote attacker can send a specially crated request and inject arbitrary HTML attribute value.

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
https://jvn.jp/en/jp/JVN28806943/index.html
https://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 non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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