Multiple vulnerabilities in JustSystems products



| Updated: 2023-04-05
Risk High
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2022-43664
CVE-2022-45115
CVE-2023-22291
CVE-2023-22660
CWE-ID CWE-416
CWE-122
Exploitation vector Network
Public exploit N/A
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

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU74339

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2022-43664

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing protected attribute identifier in Word processor. A remote attacker can trick the victim to open a specially crafted file, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ichitaro: Viewer - 2023

Hanako: Pro 3 - Personal 2022

Label Mighty: POP in Shop12 - 17

Raku Hagaki: Max

Easy postcard: 2021

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

homepage builder: 21

CPE2.3 External links

https://jvn.jp/en/jp/JVN79149117/index.html
https://www.justsystems.com/jp/corporate/info/js23001.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1673


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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

2) Heap-based buffer overflow

EUVDB-ID: #VU74340

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2022-45115

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the Attribute Arena functionality. 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: Viewer - 2023

Hanako: Pro 3 - Personal 2022

Label Mighty: POP in Shop12 - 17

Raku Hagaki: Max

Easy postcard: 2021

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

homepage builder: 21

CPE2.3 External links

https://jvn.jp/en/jp/JVN79149117/index.html
https://www.justsystems.com/jp/corporate/info/js23001.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1684


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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

3) Heap-based buffer overflow

EUVDB-ID: #VU74341

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-22291

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in Frame stream parser. 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: Viewer - 2023

Hanako: Pro 3 - Personal 2022

Label Mighty: POP in Shop12 - 17

Raku Hagaki: Max

Easy postcard: 2021

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

homepage builder: 21

CPE2.3 External links

https://jvn.jp/en/jp/JVN79149117/index.html
https://www.justsystems.com/jp/corporate/info/js23001.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1687


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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

4) Heap-based buffer overflow

EUVDB-ID: #VU74342

Risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-22660

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

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: Viewer - 2023

Hanako: Pro 3 - Personal 2022

Label Mighty: POP in Shop12 - 17

Raku Hagaki: Max

Easy postcard: 2021

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

homepage builder: 21

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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



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