Advisory Details

November 20th, 2017

Apple macOS nsurlstoraged Heap-based Buffer Overflow Privilege Escalation Vulnerability

CVE ID	CVE-2017-13829
CVSS SCORE	4.4, AV:L/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	macOS
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on vulnerable installations of Apple macOS. 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 nsurlstoraged service. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to escalate privileges under the context of the current service.
ADDITIONAL DETAILS	Apple has issued an update to correct this vulnerability. More details can be found at: https://support.apple.com/en-us/HT208112
DISCLOSURE TIMELINE	2017-06-22 - Vulnerability reported to vendor 2017-11-20 - Coordinated public release of advisory
CREDIT	Niklas Baumstark and Samuel Gro

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