CWE-567—Unsynchronized Access to Shared Data in a Multithreaded Context

名称

Unsynchronized Access to Shared Data in a Multithreaded Context

描述

The product does not properly synchronize shared data, such as static variables across threads, which can lead to undefined behavior and unpredictable data changes.

Within servlets, shared static variables are not protected from concurrent access, but servlets are multithreaded. This is a typical programming mistake in J2EE applications, since the multithreading is handled by the framework. When a shared variable can be influenced by an attacker, one thread could wind up modifying the variable to contain data that is not valid for a different thread that is also using the data within the variable. Note that this weakness is not unique to servlets.

常见后果

范围：

Confidentiality, Integrity, Availability

影响：

Read Application Data, Modify Application Data, DoS: Instability, DoS: Crash, Exit, or Restart

注释：

If the shared variable contains sensitive data, it may be manipulated or displayed in another user session. If this data is used to control the application, its value can be manipulated to cause the application to crash or perform poorly.

相关 CWE

• CWE-488Exposure of Data Element to Wrong Session
• CWE-662Improper Synchronization
• CWE-820Missing Synchronization