tip on multiple BSD-based operating systems allows local users to cause a denial of service (execution prevention) by using flock() to lock the /var/log/acculog file.
The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Freebsd | Freebsd | 3.5 (including) | 3.5 (including) |
| Freebsd | Freebsd | 3.5.1 (including) | 3.5.1 (including) |
| Freebsd | Freebsd | 4.0 (including) | 4.0 (including) |
| Freebsd | Freebsd | 4.1 (including) | 4.1 (including) |
| Freebsd | Freebsd | 4.1.1 (including) | 4.1.1 (including) |
| Freebsd | Freebsd | 4.2 (including) | 4.2 (including) |
| Freebsd | Freebsd | 4.3 (including) | 4.3 (including) |
| Freebsd | Freebsd | 4.4 (including) | 4.4 (including) |
| Freebsd | Freebsd | 4.5 (including) | 4.5 (including) |
| Freebsd | Freebsd | 4.6 (including) | 4.6 (including) |
| Freebsd | Freebsd | 5.0 (including) | 5.0 (including) |
| Netbsd | Netbsd | 1.0 (including) | 1.0 (including) |
| Netbsd | Netbsd | 1.1 (including) | 1.1 (including) |
| Netbsd | Netbsd | 1.2 (including) | 1.2 (including) |
| Netbsd | Netbsd | 1.2.1 (including) | 1.2.1 (including) |
| Netbsd | Netbsd | 1.3 (including) | 1.3 (including) |
| Netbsd | Netbsd | 1.3.1 (including) | 1.3.1 (including) |
| Netbsd | Netbsd | 1.3.2 (including) | 1.3.2 (including) |
| Netbsd | Netbsd | 1.3.3 (including) | 1.3.3 (including) |
| Netbsd | Netbsd | 1.4 (including) | 1.4 (including) |
| Netbsd | Netbsd | 1.4.1 (including) | 1.4.1 (including) |
| Netbsd | Netbsd | 1.4.2 (including) | 1.4.2 (including) |
| Netbsd | Netbsd | 1.4.3 (including) | 1.4.3 (including) |
| Netbsd | Netbsd | 1.5 (including) | 1.5 (including) |
| Netbsd | Netbsd | 1.5.1 (including) | 1.5.1 (including) |
| Netbsd | Netbsd | 1.5.2 (including) | 1.5.2 (including) |
| Openbsd | Openbsd | 2.0 (including) | 2.0 (including) |
| Openbsd | Openbsd | 2.1 (including) | 2.1 (including) |
| Openbsd | Openbsd | 2.2 (including) | 2.2 (including) |
| Openbsd | Openbsd | 2.3 (including) | 2.3 (including) |
| Openbsd | Openbsd | 2.4 (including) | 2.4 (including) |
| Openbsd | Openbsd | 2.5 (including) | 2.5 (including) |
| Openbsd | Openbsd | 2.6 (including) | 2.6 (including) |
| Openbsd | Openbsd | 2.7 (including) | 2.7 (including) |
| Openbsd | Openbsd | 2.8 (including) | 2.8 (including) |
| Openbsd | Openbsd | 2.9 (including) | 2.9 (including) |
| Openbsd | Openbsd | 3.0 (including) | 3.0 (including) |
| Openbsd | Openbsd | 3.1 (including) | 3.1 (including) |
Locking is a type of synchronization behavior that ensures that multiple independently-operating processes or threads do not interfere with each other when accessing the same resource. All processes/threads are expected to follow the same steps for locking. If these steps are not followed precisely - or if no locking is done at all - then another process/thread could modify the shared resource in a way that is not visible or predictable to the original process. This can lead to data or memory corruption, denial of service, etc.