#VU28195 Insufficient verification of data authenticity in Cybozu Desktop for Windows - CVE-2020-5537

Vulnerability identifier: #VU28195

Vulnerability risk: High

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-5537

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cybozu Desktop for Windows
Client/Desktop applications / Other client software

Vendor: Cybozu

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the improper data processing when applying the software update. A remote attacker can perform an attack, such as a man-in-the-middle (MITM), subdomain takeover, and etc. to execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cybozu Desktop for Windows: 2.0.23 - 2.2.40

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External links
https://jvn.jp/en/jp/JVN59552136/index.html
https://kb.cybozu.support/article/36329/
https://cs.cybozu.co.jp/2020/007043.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.