Buffer overflow in Hancom Office
CVE-2016-4295
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.
Vulnerability class: Buffer Overflow
EPSS: 0.022 (80.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Hancom Office — versions 2014 VP Trial HCell.exe Product version: 9.1.0.2176, HCellApp.dll Product version: 9.1.0.2176 HCellBook.dll Product version: 9.1.0.2176
- Hancom Hancom_office_2014
Weakness classification (CWE)
References
- cret@cert.org (Technical Description, Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
- cret@cert.org (vdb-entry, x_refsource_BID)
Frequently asked questions
- What is CVE-2016-4295?
- CVE-2016-4295 is a high-severity vulnerability in Hancom Office, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2017-01-06.
- How severe is CVE-2016-4295?
- High severity. CVSS v3 base score is 7.8 out of 10.