Integer overflow in Hancom Office
CVE-2016-4291
When opening a Hangul HShow Document (.hpt) and processing a structure within the document, Hancom Office 2014 will use a field from the structure in an operation that can cause the integer to overflow. This result is then used to allocate memory to copy file data in. Due to the lack of bounds checking on the integer, the allocated memory buffer can be made to be undersized at which point the reading of file data will write outside the bounds of the buffer. This 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.securityfocus.com/bid/92325 (vdb-entry)
- www.talosintelligence.com/reports/TALOS-2016-0146/ (Technical Description, Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-4291?
- CVE-2016-4291 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-2016-4291?
- High severity. CVSS v3 base score is 7.8 out of 10.