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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.
The specific flaw exists within the handling of a crafted Presentation files with an invalid “Length” header in a drawingContainer.
By providing a malformed .ppt file, an attacker can cause an memory corruption by dereferencing an uninitialized pointer.
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4) POC
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http://protekresearchlab.com/exploits/COSIG-2016-06.ppt
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39397.zip
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