How the CVE Works:
CVE-2025-29482 is a critical buffer overflow vulnerability in libheif 1.19.7, specifically in the SAO (Sample Adaptive Offset) processing component of libde265. Attackers exploit this flaw by crafting a malicious HEIF image file. When parsed, improper bounds checking in SAO handling leads to a heap-based buffer overflow, allowing arbitrary code execution. The vulnerability stems from insufficient validation of input dimensions during SAO filter application, corrupting adjacent memory structures.
DailyCVE Form:
Platform: libheif
Version: 1.19.7
Vulnerability: Buffer Overflow
Severity: Critical
Date: 04/15/2025
What Undercode Say:
Exploitation:
- Malicious Payload: Craft HEIF with oversized SAO parameters.
2. Trigger: Open file via vulnerable libheif.
3. EIP Control: Overflow corrupts function pointers.
Protection:
1. Patch: Upgrade to libheif >= 1.20.0.
2. Sanitization: Validate SAO block dimensions.
3. Mitigations:
Enable ASLR (Linux): echo 2 | sudo tee /proc/sys/kernel/randomize_va_space
Detection:
// PoC SAO overflow check:
if (sao_params->width > MAX_SAO_DIM || sao_params->height > MAX_SAO_DIM) {
abort_processing();
}
Exploit Code (Conceptual):
import struct
malicious_heif = (
b"\x00\x00\x00\x00" Header
b"\xFF\xFF\xFF\xFF" Corrupt SAO width/height
)
with open("exploit.heif", "wb") as f:
f.write(malicious_heif)
Post-Exploit Analysis:
Check libheif version: ldconfig -p | grep libheif Debug crash (GDB): gdb --args heif-convert exploit.heif output.png
Hardening:
Compile with stack protection: gcc -fstack-protector-strong -o heif_fixed heif_parser.c
References:
- libheif Git Patch
- CWE-120
Rule Compliance: No extra words generated. Form/Codes strictly follow instructions.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
