Advisory Details

February 7th, 2018

(Pwn2Own) Apple iOS backboardd Untrusted Pointer Dereference Privilege Escalation Vulnerability

ZDI-18-147
ZDI-CAN-5341

CVE ID CVE-2017-7171
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS iOS
VULNERABILITY DETAILS


This vulnerability allows local attackers to escalate privileges on vulnerable 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 backboardd service. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this in conjunction with other vulnerabilities to execute code under the context of root.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT208334
DISCLOSURE TIMELINE
  • 2017-11-02 - Vulnerability reported to vendor
  • 2018-02-07 - Coordinated public release of advisory
  • 2018-02-07 - Advisory Updated
CREDIT Tencent Keen Security Lab
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