Zero-day vulnerability in Ichitaro

Buffer overflow
CVE-2013-3644

Symantec has seen the exploitation being used in targeted attacks since May, but it has been limited to users in Japan and the volume of attacks has been minimal.

Known malware:

Trojan.Tarodrop.M.

Vulnerability details

Advisory: SB2013061802 - Remote code execution in JustSystems Ichitaro

Vulnerable component: Ichitaro

CVE-ID: CVE-2013-3644

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-120 - Buffer overflow

Description:

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

The weakness exists due to buffer overflow when processing office documents. A remote attacker can create a specially crafted document, trick the victim into opening it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code on the vulnerable system.

Note: the vulnerability was being actively exploited.

External links:

http://www.justsystems.com/jp/info/js13002.html
http://jvn.jp/en/jp/JVN98712361/index.html
http://jvndb.jvn.jp/en/contents/2013/JVNDB-2013-000058.html
https://www.symantec.com/security_response/writeup.jsp?docid=2013-061907-5714-99
https://www.symantec.com/connect/blogs/targeted-attack-exploits-ichitaro-vulnerability-0
https://www.symantec.com/connect/nl/blogs/targeted-attack-exploits-ichitaro-vulnerability?page=1

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.