(Pwn2Own) Apple macOS Core Virtual Machine Service Heap-based Buffer Overflow Vulnerability

ID ZDI-20-680
Type zdi
Reporter @jinmo123, @setuid0x0_, and @insu_yun_en of @SSLab_Gatech
Modified 2020-06-22T00:00:00


This vulnerability allows local attackers to escalate privileges on affected 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 handling of Core Virtual Machine Service caches. 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 in conjunction with other vulnerabilities to escalate privileges and execute code in the context of the kernel.