Vulnerability identifier: #VU5589

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Hancom Office
Client/Desktop applications / Office applications

Vendor: Hancom, Inc.

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

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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...

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.