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Application: WPS Office

Platforms: Windows

Versions: Version 2016

Author: Francis Provencher of COSIG

Twitter: @COSIG_

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1) Introduction
2) Report Timeline
3) Technical details
4) POC

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1) Introduction
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WPS Office (an acronym for Writer, Presentation and Spreadsheets,[2] previously known as Kingsoft Office) is an office

suite for Microsoft Windows, Linux,[1] iOS[3] and Android OS,[4] developed by Zhuhai-basedChinese software developer Kingsoft.

WPS Office is a suite of software which is made up of three primary components: WPS Writer, WPS Presentation, and WPS Spreadsheet.

The personal basic version is free to use, but a watermark is printed on all printed output after the 30 day trial ends.

(https://en.wikipedia.org/wiki/WPS_Office)

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2) Report Timeline
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2015-12-31: Francis Provencher from COSIG report the issue to WPS;
2016-01-04: WPS security confirm this issue;
2016-01-14: COSIG ask an update status;
2016-01-21: COSIG ask an update status;
2016-02-01: COSIG release this advisory;

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3) Technical details
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This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of WPS.
User interaction is required to exploit this vulnerability in that the target must open a malicious file.
By providing a malformed .xls file, an attacker can cause an heap memory corruption.
An attacker could leverage this to execute arbitrary code under the context of the WPS Spreadsheet process.

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4) POC

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http://protekresearchlab.com/exploits/COSIG-2016-07.xlsx
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/39398.zip

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