Vulnerability identifier: #VU74342

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-22660

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ichitaro
Client/Desktop applications / Office applications
Hanako
Client/Desktop applications / Office applications
Label Mighty
Client/Desktop applications / Office applications
Raku Hagaki
Client/Desktop applications / Office applications
Easy postcard
Client/Desktop applications / Office applications
JUST Office
Client/Desktop applications / Office applications
JUST Government
Client/Desktop applications / Office applications
JUST Police
Client/Desktop applications / Office applications
homepage builder
Client/Desktop applications / Office applications

Vendor: JustSystems Corporation

Description

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

The vulnerability exists due to a boundary error when processing "LayoutBox" stream. A remote attacker can trick the victim to open a specially crafted file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Ichitaro: 2021 - Viewer

Hanako: Personal 2021 - Pro 5

Label Mighty: 17 - POP in Shop12

Raku Hagaki: Max

Easy postcard: 2021

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

homepage builder: 21

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External links
http://jvn.jp/en/jp/JVN79149117/index.html
http://www.justsystems.com/jp/corporate/info/js23001.html
http://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1722

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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.