(Pwn2Own) Apple Safari Pointer Authentication Code Bypass Vulnerability

February 24th, 2025
ZDI-25-093 ZDI-CAN-26551

CVE ID

CVE-2024-27834

CVSS Score

5.0 AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Affected Vendors

Apple

Affected Products

Safari

Vulnerability Details

This vulnerability allows remote attackers to bypass the Pointer Authentication Code protection mechanism on affected installations of Apple Safari. 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 libpas allocator. The protection mechanism does not properly protect the data pointers. An attacker can leverage this vulnerability to execute arbitrary code in the context of the current user.

Additional Details

Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-la/120896

Disclosure Timeline

  • 2025-02-12 - Vulnerability reported to vendor
  • 2025-02-24 - Coordinated public release of advisory
  • 2025-02-24 - Advisory Updated

Credit

Manfred Paul (@_manfp)

Back to Advisories