Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Race condition in the mod_auth_shadow module for the Apache HTTP Server allows remote attackers to bypass authentication, and read and possibly modify data, via vectors related to improper interaction with an external helper application for validation of credentials.
CWE-362 - Race Condition
A race condition occurs in a shared memory program when two threads/processes access the same shared memory data, and at least one thread executes a write operation. This vulnerability manipulates the time to check vs. time to use (TOC/TOU) gap between the threads in the critical section to cause disorientation in the shared data. The impact can vary from compromising the confidentiality of the system to causing the system to crash or to execute arbitrary code.