An exploitable shared memory permissions vulnerability exists in the functionality of X11 Mesa 3D Graphics Library 19.1.2. An attacker can access the shared memory without any specific permissions to trigger this vulnerability.
Weakness
A product defines a set of insecure permissions that are inherited by objects that are created by the program.
Affected Software
| Name |
Vendor |
Start Version |
End Version |
| Mesa |
Mesa3d |
19.1.2 (including) |
19.1.2 (including) |
| Mesa |
Ubuntu |
bionic |
* |
| Mesa |
Ubuntu |
devel |
* |
| Mesa |
Ubuntu |
disco |
* |
| Mesa |
Ubuntu |
eoan |
* |
| Mesa |
Ubuntu |
trusty |
* |
| Mesa |
Ubuntu |
upstream |
* |
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