A Cisco Talos researcher discovered these vulnerabilities.

Cisco Talos recently discovered four vulnerabilities in Ichitaro, a popular word processing software in Japan produced by JustSystems that could lead to arbitrary code execution.

Ichitaro uses the ATOK input method (IME) and uses the proprietary .jtd file extension. It’s the second most-popular word processing system in Japan behind only Microsoft word.

Talos discovered four vulnerabilities that could allow an attacker to gain the ability to execute arbitrary code on the targeted machine. TALOS-2022-1673 (CVE-2022-43664) can trigger the reuse of freed memory by the attacker, which can lead to further memory corruption and potentially result in arbitrary code execution after the target opens an attacker-created malicious file. TALOS-2023-1722 (CVE-2023-22660) has a similar effect, though in this case, it’s caused by a buffer overflow condition.

There are two other memory corruption vulnerabilities that can also be triggered if the target opens a specially crafted, malicious document — TALOS-2022-1687 (CVE-2023-22291) and TALOS-2022-1684 (CVE-2022-45115) — which could also lead to code execution.

Cisco Talos worked with JustSystems to ensure these vulnerabilities are resolved and an update is available for affected customers, all in adherence to Cisco’s vulnerability disclosure policy.

Users are encouraged to update these affected products as soon as possible: Ichitaro 2022, version Talos tested and confirmed this version of the word processor could be exploited by these vulnerabilities.

The following Snort rules will detect exploitation attempts against this vulnerability:
61011, 61012, 61091, 61092, 61163, 61164, 61393 and 61394. Additional rules may be released in the future and current rules are subject to change, pending additional vulnerability information. For the most current rule information, please refer to your Cisco Secure Firewall Management Center or Snort.org.