IBM WebSphere Application Server 9.0, and 8.5 traditional is vulnerable to pre-authentication unsafe deserialization which could allow a remote attacker to bypass authentication or execute arbitrary code.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Websphere_application_server | Ibm | 8.5.0.0 (including) | 8.5.5.31 (excluding) |
| Websphere_application_server | Ibm | 9.0.0.0 (including) | 9.0.5.29 (excluding) |
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.