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Application: WPS Office
Platforms: Windows
Versions: Version before 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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2015-11-24: Francis Provencher from COSIG report the issue to WPS;
2015-12-06: WPS security confirm this issue;
2016-01-01: COSIG ask an update status;
2016-01-07: COSIG ask an update status;
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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The specific flaw exists within the handling of a crafted PPT files with an invalid value into “texttype” in the “clientTextBox”
into a “DrawingContainer”. An heap memory corruption occured and could allow remote attackers to execute arbitrary code
on vulnerable installations of WPS. User interaction is required to exploit this vulnerability, the target must open a malicious file.
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4) POC
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http://protekresearchlab.com/exploits/COSIG-2016-04.ppt
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39395.zip
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