Advisory Details

February 3rd, 2021

Apple iOS FairplayIOKit Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-21-251
ZDI-CAN-12053

CVE ID CVE-2021-1791
CVSS SCORE 5.6, (AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS iOS
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose sensitive information on affected installations of Apple iOS. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the FairplayIOKit kext. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the kernel.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT212146
DISCLOSURE TIMELINE
  • 2020-10-02 - Vulnerability reported to vendor
  • 2021-02-03 - Coordinated public release of advisory
  • 2021-02-24 - Advisory Updated
CREDIT Junzhi Lu(@pwn0rz), Qi Sun and Mickey Jin
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