CVE-2026-21502 iccDEV XML解析器空指针解引用漏洞

/* * CVE-2026-21502 PoC - NULL Pointer Dereference in iccDEV XML Parser * This PoC demonstrates the vulnerability in iccDEV versions < 2.3.1.2 * * Note: This is a simplified demonstration of the vulnerability concept. * The actual exploit requires crafting a malicious ICC profile with specific * XML tags that trigger the NULL pointer dereference. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated XML tag structure that triggers the vulnerability typedef struct { char* tag_name; char* attribute; char* value; } XMLTag; // Vulnerable function - simulates iccDEV XML parser behavior void parse_xml_tag(XMLTag* tag) { char* ptr = NULL; // Simulates uninitialized pointer // Vulnerability: Direct dereference without NULL check // In real iccDEV, this occurs when parsing specific XML tags printf("Processing tag: %s\n", tag->tag_name); // This simulates the vulnerable code path if (tag->attribute != NULL && strlen(tag->attribute) > 0) { ptr = (char*)malloc(10); // Allocate memory free(ptr); // Free the memory // Now ptr is NULL, but code continues without check } // Simulating NULL pointer dereference // In real vulnerability, this happens when accessing freed/null objects printf("Attribute value: %s\n", ptr); // NULL dereference here } int main() { printf("CVE-2026-21502 PoC - iccDEV NULL Pointer Dereference\n"); printf("===================================================\n\n"); XMLTag malicious_tag = { .tag_name = "ProfileDescriptionTag", .attribute = "localizedString", .value = "malicious_value" }; printf("Attempting to parse malicious ICC profile XML tag...\n"); parse_xml_tag(&malicious_tag); return 0; } /* * To exploit this vulnerability: * 1. Create a malicious ICC profile file * 2. Insert specially crafted XML tags that trigger NULL pointer dereference * 3. Use tools like iccMAX or iccJSON to process the file * 4. The parser will crash when encountering the malformed XML * * Real-world exploit would require: * - Understanding iccDEV's specific XML parsing implementation * - Crafting ICC profile with specific tag structures * - Triggering the vulnerable code path through normal application usage */