October macOS Patch Fixes FAT/USB Vulnerability [source: trendmicro]
by CIRT Team
October’s macOS security update contained a fix for a vulnerability that Trend Micro privately disclosed to Apple earlier this year. The vulnerability (designated as CVE-2017-13811), was in the fsck_msdos system tool. This tool checks for and fixes errors in devices formatted with the FAT filesystem, and is automatically invoked by macOS when a device using FAT (such as a USB disk or an SD card) is inserted.
The vulnerability allows arbitrary code to be executed with system-level privileges, which potentially lets a malicious device (such as the mentioned flash disks or SD cards) take over the entire system when the said device is inserted into the vulnerable system. We do not believe that this attack has been used in the wild. We strongly recommend that users update their software to address this flaw, as well as the others that were part of this update cycle.
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