Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| 365_apps | Microsoft | - (including) | - (including) |
| Office | Microsoft | 2019 (including) | 2019 (including) |
| Office_long_term_servicing_channel | Microsoft | 2021 (including) | 2021 (including) |
| Office_long_term_servicing_channel | Microsoft | 2024 (including) | 2024 (including) |
| Sharepoint_server | Microsoft | * | 16.0.19127.20518 (excluding) |
| Sharepoint_server | Microsoft | 2016 (including) | 2016 (including) |
| Sharepoint_server | Microsoft | 2019 (including) | 2019 (including) |
| Word | Microsoft | 2016 (including) | 2016 (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.