The seffaflik thru 0.0.9 is vulnerable to symlink attacks due to incorrect default permissions given to the .kimlik file and .seffaflik file, which is created with mode 0777 and 0775 respectively, exposing secrets to other local users. Additionally, the .kimlik file is written without symlink checks, allowing local attackers to overwrite arbitrary files. This can result in information disclosure and denial of service.
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