Zero-day vulnerability in Ichitaro

Stack-based buffer overflow
CVE-2007-6436

Known malware:

Trojan.Tarodrop.F

Vulnerability details

Advisory: SB2007121401 - Buffer overflow in JustSystems Ichitaro

Vulnerable component: Ichitaro

CVE-ID: CVE-2007-6436

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C

CWE-ID: CWE-119 - Memory corruption

Description:

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

The vulnerability exists due to boundary error in JSGCI.DLL library when processing malicious documents. A remote attacker can create a specially crafted document file, trick the victim into opening it, cause stack-based buffer overflow and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Note: this vulnerability is being actively exploited.

External links:

http://www.justsystems.com/jp/info/pd7005.html
http://www.symantec.com/security_response/writeup.jsp?docid=2007-121308-3953-99

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.