Advisory Details

September 10th, 2020

Microsoft Word DOCX File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-1131
ZDI-CAN-11242

CVE ID CVE-2020-1338
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Word
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Word. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of DOCX files. Crafted data in a DOCX file can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1338
DISCLOSURE TIMELINE
  • 2020-07-01 - Vulnerability reported to vendor
  • 2020-09-10 - Coordinated public release of advisory
CREDIT Anonymous
BACK TO ADVISORIES