Heap Overflow Vulnerability in Hancom Office 2014 when Processing Hangul Hcell Document

CVE-2016-4295 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

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.

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