In Splunk Enterprise for Windows versions below 9.2.3 and 9.1.6, a low-privileged user that does not hold the admin or power Splunk roles could perform a Remote Code Execution (RCE) due to an insecure session storage configuration.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Splunk | Splunk | 9.1.0 (including) | 9.1.6 (excluding) |
| Splunk | Splunk | 9.2.0 (including) | 9.2.3 (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.