Incorrect Default Permissions vulnerability in Smart Device Communication Gateway preinstalled on MELIPC Series MI5122-VW firmware versions 05 to 07 allows a local attacker to execute arbitrary code by saving a malicious file to a specific folder. As a result, the attacker may disclose, tamper with, destroy or delete information in the product, or cause a denial-of-service (DoS) condition on the product.
Weakness
During installation, installed file permissions are set to allow anyone to modify those files.
Potential Mitigations
- Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
- Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
References