Remote code execution in Hangul Word Processor

1) Type confusion

EUVDB-ID: #VU5589

Risk: Critical

CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2015-6585

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Hancom Office: 2014 VP

External links

http://www.boho.or.kr/data/secNoticeView.do?bulletin_writing_sequence=23907
http://www.fireeye.com/content/dam/fireeye-www/global/en/blog/threat-research/FireEye_HWP_ZeroDay.p...

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?

Yes. This vulnerability is being exploited in the wild.