Multiple vulnerabilities in JustSystems products



| Updated: 2023-10-19
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2023-34366
CVE-2023-38127
CVE-2023-38128
CVE-2023-35126
CWE-ID CWE-416
CWE-190
CWE-843
CWE-129
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Rakuraku Hagaki
Client/Desktop applications / Office applications

Ichitaro
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

Vendor JustSystems Corporation

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU82233

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-34366

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. A remote attacker can trick a victim to open a specially crafted file and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Rakuraku Hagaki: All versions

Ichitaro: Viewer - 2023

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

CPE2.3 External links

https://jvn.jp/en/jp/JVN28846531/index.html
https://www.justsystems.com/jp/corporate/info/js23002.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1758


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) Integer overflow

EUVDB-ID: #VU82234

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-38127

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow. A remote attacker can trick a victim to open a specially crafted file, trigger integer overflow and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Rakuraku Hagaki: All versions

Ichitaro: Viewer - 2023

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

CPE2.3 External links

https://jvn.jp/en/jp/JVN28846531/index.html
https://www.justsystems.com/jp/corporate/info/js23002.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1808


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) Type Confusion

EUVDB-ID: #VU82235

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-38128

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a type confusion error. A remote attacker can trick a victim to open a specially crafted file, trigger a type confusion error and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Rakuraku Hagaki: All versions

Ichitaro: Viewer - 2023

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

CPE2.3 External links

https://jvn.jp/en/jp/JVN28846531/index.html
https://www.justsystems.com/jp/corporate/info/js23002.html


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) Improper Validation of Array Index

EUVDB-ID: #VU82236

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-35126

CWE-ID: CWE-129 - Improper Validation of Array Index

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of array index. A remote attacker can trick a victim to open a specially crafted file and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Rakuraku Hagaki: All versions

Ichitaro: Viewer - 2023

JUST Office: 3 - 5

JUST Government: 3 - 5

JUST Police: 3 - 5

CPE2.3 External links

https://jvn.jp/en/jp/JVN28846531/index.html
https://www.justsystems.com/jp/corporate/info/js23002.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1825


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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