Vulnerability identifier: #VU59178

Vulnerability risk: Low

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20875

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GroupSession Free edition
Client/Desktop applications / Other client software
GroupSession byCloud
Client/Desktop applications / Other client software
GroupSession ZION
Client/Desktop applications / Other client software

Vendor: Japan Total System

Description

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

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote administrator can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

GroupSession Free edition: 5.1.1

GroupSession byCloud: 5.1.1

GroupSession ZION: 5.1.1

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External links
http://groupsession.jp/info/info-news/security20211220
http://jvn.jp/en/jp/JVN79798166/index.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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