Advisory Details

June 25th, 2021

Apple WebKit KeyframeEffect Use-After-Free Remote Code Execution Vulnerability

ZDI-21-761
ZDI-CAN-12579

CVE ID CVE-2021-30749
CVSS SCORE 8.8, AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Apple
AFFECTED PRODUCTS WebKit
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple WebKit. 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 KeyframeEffect class. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/HT212529
DISCLOSURE TIMELINE
  • 2021-02-12 - Vulnerability reported to vendor
  • 2021-06-25 - Coordinated public release of advisory
CREDIT mipu94 of SEFCOM lab, ASU.
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