EUVD-2025-204542

Comprehensive Technical Analysis of EUVD-2025-204542

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-204542 affects AVideo versions 14.3.1 through 20.1. It involves an unauthenticated remote code execution (RCE) vulnerability due to the predictable generation of an installation salt using PHP's uniqid() function. The installation timestamp is exposed via a public endpoint, and a derived hash identifier is accessible through unauthenticated API responses. This allows attackers to brute-force the remaining entropy and recover the salt, which can then be used to encrypt a malicious payload supplied to a notification API endpoint, resulting in arbitrary code execution as the web server user.

Severity Evaluation:

• CVSS Base Score: 9.3
• CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The high base score indicates a critical vulnerability. The attack vector is network-based (AV:N), requires low complexity (AC:L), and does not require any privileges (PR:N) or user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (VC:H, VI:H, VA:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Public Endpoint Exposure: The installation timestamp is exposed via a public endpoint, which can be accessed without authentication.
2. API Response Access: A derived hash identifier is accessible through unauthenticated API responses.
3. Brute-Force Attack: Attackers can brute-force the remaining entropy to recover the installation salt.
4. Malicious Payload Execution: The recovered salt can be used to encrypt a malicious payload, which is then supplied to a notification API endpoint that evaluates attacker-controlled input, leading to arbitrary code execution.

Exploitation Methods:

1. Reconnaissance: Attackers can gather the installation timestamp and derived hash identifier from public endpoints and API responses.
2. Brute-Force: Using the gathered information, attackers can perform a brute-force attack to recover the installation salt.
3. Payload Delivery: With the recovered salt, attackers can encrypt a malicious payload and deliver it to the notification API endpoint.
4. Code Execution: The notification API endpoint evaluates the attacker-controlled input, resulting in arbitrary code execution as the web server user.

3. Affected Systems and Software Versions

Affected Software:

• AVideo versions 14.3.1 through 20.1

Vendor:

• World Wide Broadcast Network

Product:

• AVideo

Versions:

• 14.3.1 through 20.1

4. Recommended Mitigation Strategies

1. Immediate Patching: Upgrade to AVideo version 20.1 or later, which addresses the vulnerability.
2. Endpoint Security: Restrict access to the public endpoint exposing the installation timestamp.
3. API Security: Implement authentication and authorization mechanisms for API endpoints to prevent unauthenticated access.
4. Input Validation: Ensure that all input to the notification API endpoint is properly validated and sanitized to prevent code execution.
5. Monitoring and Logging: Implement robust monitoring and logging to detect and respond to suspicious activities.
6. Network Segmentation: Segment the network to limit the impact of a potential breach.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using AVideo within the European Union. Given the critical nature of the vulnerability, it could lead to widespread exploitation, resulting in data breaches, service disruptions, and potential financial losses. The European cybersecurity landscape must prioritize patching and mitigation strategies to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Cause: Predictable generation of an installation salt using PHP's uniqid() function.
• Exposure: Installation timestamp and derived hash identifier accessible through public endpoints and unauthenticated API responses.
• Exploitation: Brute-force attack to recover the salt, followed by encrypting a malicious payload and delivering it to the notification API endpoint for code execution.

References:

• GitHub Commit 4a53ab2
• GitHub Commit a2bdbff
• VulnCheck Advisory
• NVD CVE-2025-34433
• Chocapikk Blog Post

Aliases:

• CVE-2025-34433

Assigner:

• VulnCheck

ENISA IDs:

• Product: 990d2f41-5441-3fc5-af68-c654a5fc47d6
• Vendor: 4491dac0-3e88-39bc-a251-2787c96ce350

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of exploitation and protect their systems from potential attacks.