Integer overflow in Hancom Office
CVE-2016-4290
When opening a Hangul HShow Document (.hpt) and processing a structure within the document, Hancom Office 2014 will attempt to allocate space for a block of data within the file. When calculating this length, the application will use a value from the file and add a constant to it without checking whether the addition of the constant will cause the integer to overflow which will cause the buffer to be undersized when the application tries to copy file data into it. This allows one to overwrite contiguous data in the heap which can lead to code-execution under the context of the application.
Vulnerability class: Integer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.021 (81.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
- Hancom Office — versions 2014 VP Trial HShow.exe Product version: 9.1.0.2176 HncBM90.dll Product version: 9.1.0.2291
- Hancom Office 2014
Weakness classification (CWE)
References
- www.talosintelligence.com/reports/TALOS-2016-0145/ (Technical Description, Exploit, VDB Entry, Third Party Advisory)
- www.securityfocus.com/bid/92325 (vdb-entry)
Frequently asked questions
- What is CVE-2016-4290?
- CVE-2016-4290 is a high-severity vulnerability in Hancom Office, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2017-01-06.
- How severe is CVE-2016-4290?
- High severity. CVSS v3 base score is 7.8 out of 10.