Advisory Details

March 12th, 2020

Microsoft Word HTML Rendering Use-After-Free Remote Code Execution Vulnerability

ZDI-20-284
ZDI-CAN-9959

CVE ID CVE-2020-0851
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 processing of DOC files with HTML in wwlib. A crafted file can cause a pointer to be reused after it has been freed. 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-2020-0851
DISCLOSURE TIMELINE
  • 2020-01-10 - Vulnerability reported to vendor
  • 2020-03-12 - Coordinated public release of advisory
CREDIT asnine
BACK TO ADVISORIES