In FreeBSD 13.0-STABLE before n245118, 12.2-STABLE before r369552, 11.4-STABLE before r369560, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, a superuser inside a FreeBSD jail configured with the non-default allow.mount permission could cause a race condition between the lookup of .. and remounting a filesystem, allowing access to filesystem hierarchy outside of the jail.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | * | 11.4 (excluding) |
| Freebsd | Freebsd | 12.0 (including) | 12.2 (excluding) |
| Freebsd | Freebsd | 11.4 (including) | 11.4 (including) |
| Freebsd | Freebsd | 11.4-beta1 (including) | 11.4-beta1 (including) |
| Freebsd | Freebsd | 11.4-p1 (including) | 11.4-p1 (including) |
| Freebsd | Freebsd | 11.4-p2 (including) | 11.4-p2 (including) |
| Freebsd | Freebsd | 11.4-p3 (including) | 11.4-p3 (including) |
| Freebsd | Freebsd | 11.4-p4 (including) | 11.4-p4 (including) |
| Freebsd | Freebsd | 11.4-p5 (including) | 11.4-p5 (including) |
| Freebsd | Freebsd | 11.4-rc1 (including) | 11.4-rc1 (including) |
| Freebsd | Freebsd | 11.4-rc2 (including) | 11.4-rc2 (including) |
| Freebsd | Freebsd | 12.2 (including) | 12.2 (including) |
| Freebsd | Freebsd | 12.2-p1 (including) | 12.2-p1 (including) |
| Freebsd | Freebsd | 12.2-p2 (including) | 12.2-p2 (including) |
| Freebsd | Freebsd | 13.0-beta1 (including) | 13.0-beta1 (including) |
| Freebsd | Freebsd | 13.0-beta2 (including) | 13.0-beta2 (including) |
| Freebsd | Freebsd | 13.0-beta3 (including) | 13.0-beta3 (including) |
| Freebsd | Freebsd | 13.0-beta4 (including) | 13.0-beta4 (including) |
| Freebsd | Freebsd | 13.0-rc1 (including) | 13.0-rc1 (including) |
| Freebsd | Freebsd | 13.0-rc2 (including) | 13.0-rc2 (including) |
| Freebsd | Freebsd | 13.0-rc3 (including) | 13.0-rc3 (including) |
| Freebsd | Freebsd | 13.0-rc4 (including) | 13.0-rc4 (including) |
| Freebsd | Freebsd | 13.0-rc5 (including) | 13.0-rc5 (including) |
A race condition occurs within concurrent environments, and it is effectively a property of a code sequence. Depending on the context, a code sequence may be in the form of a function call, a small number of instructions, a series of program invocations, etc. A race condition violates these properties, which are closely related:
A race condition exists when an “interfering code sequence” can still access the shared resource, violating exclusivity. The interfering code sequence could be “trusted” or “untrusted.” A trusted interfering code sequence occurs within the product; it cannot be modified by the attacker, and it can only be invoked indirectly. An untrusted interfering code sequence can be authored directly by the attacker, and typically it is external to the vulnerable product.