Remote code execution in Cybozu Desktop for Windows

1) Insufficient verification of data authenticity

EUVDB-ID: #VU28195

Risk: High

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5537

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

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

External links

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

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.