Advisory Details

September 10th, 2020

Microsoft Internet Explorer CTSF3CandidateMessage Use-After-Free Remote Code Execution Vulnerability

ZDI-20-1123
ZDI-CAN-10834

CVE ID CVE-2020-0908
CVSS SCORE 6.3, AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Internet Explorer. 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 handling of CTSF3CandidateMessage objects in the MSCTF module. By manipulating a document's elements, an attacker 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 at low integrity.

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-2020-0908
DISCLOSURE TIMELINE
  • 2020-06-11 - Vulnerability reported to vendor
  • 2020-09-10 - Coordinated public release of advisory
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