The Security - Keychain component in Apple OS X before 10.9.4 does not properly implement keystroke observers, which allows physically proximate attackers to bypass the screen-lock protection mechanism, and enter characters into an arbitrary window under the lock window, via keyboard input.
| Software | From | Fixed in |
|---|---|---|
| apple / mac_os_x | 10.9.2 | 10.9.2.x |
| apple / mac_os_x | 10.9 | 10.9.x |
| apple / mac_os_x | 10.9.1 | 10.9.1.x |
| apple / mac_os_x | 10.9.3 | 10.9.3.x |