The ability to write to unwritable memory pages poses a significant security risk as it allows arbitrary code execution within system libraries like libc, leading to potential privilege escalation. The real-world exploitability is moderate due to the need for specific conditions and configurations.
The /proc/self/mem interface allows writes to unwritable memory pages, potentially leading to code injection and execution within protected areas such as libc functions. This affects Linux systems with specific configurations, primarily in scenarios where untrusted users can leverage this behavior for privilege escalation.
Affected Systems
- Linux Kernel versions that support /proc/*/mem interface
Affected Versions: All Linux kernels with /proc/*/mem implementation
Remediation
- Update to a patched version of the kernel if available, or disable the /proc/self/mem functionality.
- Apply hardening measures such as enabling CONFIG_STRICT_DEVMEM to prevent access to device memory via /proc interfaces.
Stack Impact
This affects Linux Kernel versions with the /proc/*/mem interface. It could impact homelab components and services that rely on these kernel functionalities, particularly in environments where untrusted users have access.