#VU27337 Improper Authorization in Cybozu Garoon - CVE-2020-5566

Vulnerability identifier: #VU27337

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-5566

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cybozu Garoon
Web applications / Other software

Vendor: Cybozu

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to missing authorization checks in the applications "E-mail" and "Messages". A remote authenticated attacker can alter applications' data.

Note: This vulnerability affects the applications "E-mail" and "Messages" in versions 4.0.0 to 4.0.2, and "Messages" in versions 4.0.3 to 4.10.3.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cybozu Garoon: 4.0.0 - 4.10.3

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External links
https://jvn.jp/en/jp/JVN35649781/index.html
https://kb.cybozu.support/article/36113/

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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.