Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 1

Remote code execution in Hangul Word Processor
CVE-2015-6585

Type confusion

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

The vulnerability exists due to type confusion error. A remote attacker can create a specially crafted HWPX file containing a set of directories and XML files, trick the victim into opening it, cause memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of this vulnerability may result in arbitrary code execution on the vulnerable system.

Note: this vulnerability is being actively exploited.

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Trojan.Volgmer.B. Attackers from North Korea exploited the vulnerability HANGMAN in a word processor popular with the South Korea's government to steal the documents and upload them to a C&C server.
North Korea attack in June dubbed "Macktruck".

Software: Hancom Office

Trojan.Volgmer.B. Attackers from North Korea exploited the vulnerability HANGMAN in a word processor popular with the South Korea's government to steal the documents and upload them to a C&C server.
North Korea attack in June dubbed "Macktruck".

Links:

https://www.fireeye.com/content/dam/fireeye-www/global/en/blog/threat-research/FireEye_HWP_ZeroDay.p...
https://www.fireeye.com/blog/threat-research/2015/09/zero-day_hwp_exploit.html
http://www.pcworld.com/article/2982577/north-korea-is-likely-behind-attacks-exploiting-a-korean-word...
http://www.hancom.com/index.jsp
http://securityaffairs.co/wordpress/40029/hacking/north-kore-0-day-hangul.html
https://c0deman.wordpress.com/2015/11/02/hangul-word-processor-hwp-zero-day-possible-ties-to-north-k...
http://www.securityweek.com/north-korea-suspected-using-zero-day-attack-south
http://www.theregister.co.uk/2015/09/10/north_korea_exploits_zero_day_in_seouls_favourite_word_doc/
http://www.spamfighter.com/News-19851-North-Korea-Probably-Main-Architect-of-Cyberattacks-in-South-K...
http://www.ehackingnews.com/2015/09/researchers-say-north-korea-behind.html


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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.