RW System Paths Permission

Checking for writable partitions and system directories

Unusual permissions on system directories may indicate a customized or rooted device. Although the system and data directories are normally mounted read-only, you'll sometimes find them mounted read-write when the device is rooted. Look for these filesystems mounted with the "rw" flag or try to create a file in the data directories.

more info : https://github.com/OWASP/owasp-mstg/blob/master/Document/0x05j-Testing-Resiliency-Against-Reverse-Engineering.md#checking-for-writable-partitions-and-system-directories