Since this is a bypass of S2-066, it's necessary to understand the principle behind the previous vulnerability. My previous article, "Apache Struts2 File Upload Analysis (S2-066)," provided a detailed explanation, so I won't go into detail here. The official fix for that vulnerability was quite drastic: when setting parameters in
This is because the official documentation directly uses a new class. The official documentation recommends using the new interceptor
FileUploadInterceptor, it ignores case sensitivity, iterates through and deletes parameters with the same name, and then adds them again.This is because the official documentation directly uses a new class. The official documentation recommends using the new interceptor
org.apache.struts2.interceptor.ActionFileUploadInterceptor when handling uploads.The latest Spring 2025 release is out! Order now, bosses! Priority given to those who qualify for discounts, first come, first served. No price negotiation for minimum orders. Open University of China
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Configure IDS to monitor network traffic.
If a DsGetDCChange request source is not found in the "Replication Allowed List",
use DCSYNCMonitor to monitor network traffic.
We can also use network traffic to detect DCSync attacks. A tool called DCSYNCMonitor needs to be installed on the domain controller to monitor network traffic. This tool will trigger an alert when any replication is performed over the network. This may trigger a false alarm when the actual domain controller requests replication. Therefore, it is recommended to use the DCSYNCMonitor tool and configuration file, where we specify the IP address of the domain controller in the network, to avoid false alarms.
If a DsGetDCChange request source is not found in the "Replication Allowed List",
use DCSYNCMonitor to monitor network traffic.
We can also use network traffic to detect DCSync attacks. A tool called DCSYNCMonitor needs to be installed on the domain controller to monitor network traffic. This tool will trigger an alert when any replication is performed over the network. This may trigger a false alarm when the actual domain controller requests replication. Therefore, it is recommended to use the DCSYNCMonitor tool and configuration file, where we specify the IP address of the domain controller in the network, to avoid false alarms.