PX4 Autopilot through 1.17.0 contains an uncontrolled stack allocation vulnerability in the file2 test command that fails to validate the write chunk size parameter. Attackers with shell access can supply an excessively large value to the -c option to trigger stack overflow and crash the flight controller.
Weakness
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
Potential Mitigations
References
- https://github.com/PX4/PX4-Autopilot
- https://github.com/PX4/PX4-Autopilot/blob/d6f12ad1c4f70ad3230afd7d86e971421e02fef4/src/systemcmds/tests/test_file2.c#L86-L130
- https://github.com/PX4/PX4-Autopilot/commit/46a77d8ad15e7929ef261c41083dffd1bbfa9f85
- https://github.com/PX4/PX4-Autopilot/pull/28586
- https://www.vulncheck.com/advisories/px4-autopilot-through-1.17.0-stack-exhaustion-via-tests-file2-command
- https://github.com/PX4/PX4-Autopilot/pull/28586