CVEs-PoC/2016/CVE-2016-4295.md

### [CVE-2016-4295](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4295)
![](https://img.shields.io/static/v1?label=Product&message=Hancom%20Office&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=2014%20VP%20Trial%20HCell.exe%20Product%20version%3A%209.1.0.2176%2C%20HCellApp.dll%20Product%20version%3A%209.1.0.2176%20HCellBook.dll%20Product%20version%3A%209.1.0.2176%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=index%20miscalculation&color=brightgreen)

### Description

When opening a Hangul Hcell Document (.cell) and processing a particular record within the Workbook stream, an index miscalculation leading to a heap overlow can be made to occur in Hancom Office 2014. The vulnerability occurs when processing data for a formula used to render a chart via the HncChartPlugin.hplg library. Due to a lack of bounds-checking when incrementing an index that is used for writing into a buffer for formulae, the application can be made to write pointer data outside its bounds which can lead to code execution under the context of the application.

### POC

#### Reference
- http://www.talosintelligence.com/reports/TALOS-2016-0150/

#### Github
No PoCs found on GitHub currently.