Microsoft Exchange Server Remote Code Execution Vulnerability
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Exchange_server | Microsoft | 2016-cumulative_update_23 (including) | 2016-cumulative_update_23 (including) |
| Exchange_server | Microsoft | 2019-cumulative_update_12 (including) | 2019-cumulative_update_12 (including) |
| Exchange_server | Microsoft | 2019-cumulative_update_13 (including) | 2019-cumulative_update_13 (including) |
Potential Mitigations
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.