Vulnerability identifier: #VU56941

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20796

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cybozu Remote Service
Client/Desktop applications / Other client software

Vendor: Cybozu

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the management screen. A remote authenticated attacker can send a specially crafted HTTP request and upload an arbitrary file on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cybozu Remote Service: 3.1.8

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External links
http://jvn.jp/en/jp/JVN52694228/index.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.