Advisory Details

September 16th, 2021

Microsoft PowerPoint PPT File Parsing Double Free Remote Code Execution Vulnerability

ZDI-21-1084
ZDI-CAN-14451

CVE ID CVE-2021-38659
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 PowerPoint
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft PowerPoint. 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 PPT files. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. 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://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38659
DISCLOSURE TIMELINE
  • 2021-07-28 - Vulnerability reported to vendor
  • 2021-09-16 - Coordinated public release of advisory
CREDIT Tran Van Khang - khangkito (VinCSS)
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