CVE-2025-30356

Comprehensive Technical Analysis of CVE-2025-30356

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-30356 CVSS Score: 9.8

Severity Evaluation: The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for remote code execution, the complexity of the attack being low, and the impact being high. The vulnerability involves a heap buffer overflow, which can lead to arbitrary code execution, denial of service, or data corruption.

Vulnerability Assessment: The vulnerability exists in the Crypto_TC_ApplySecurity function within the CryptoLib software. Specifically, it arises from an incomplete validation check on the fl (frame length) field, which can result in a heap buffer overflow. This issue persists despite a previous patch (CVE-2025-29912) that addressed an underflow issue involving the same field. The current vulnerability allows an attacker to craft malicious frames that cause a negative tf_payload_len, interpreted as a large unsigned value, leading to a heap buffer overflow during a memcpy call.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Remote Exploitation: An attacker can send specially crafted frames to the spacecraft's communication system, exploiting the vulnerability to cause a heap buffer overflow.
2. Man-in-the-Middle (MitM) Attack: An attacker intercepting the communication between the spacecraft and the ground station can inject malicious frames to exploit the vulnerability.
3. Insider Threat: An insider with access to the communication system can craft and send malicious frames to exploit the vulnerability.

Exploitation Methods:

1. Heap Buffer Overflow: By sending a frame with a carefully crafted fl field, an attacker can trigger a heap buffer overflow, potentially leading to remote code execution.
2. Denial of Service (DoS): An attacker can send frames that cause the system to crash or become unresponsive, leading to a denial of service.
3. Data Corruption: Exploiting the vulnerability can result in data corruption, affecting the integrity of the communication between the spacecraft and the ground station.

3. Affected Systems and Software Versions

Affected Systems:

• Spacecraft running the core Flight System (cFS)
• Ground stations communicating with the spacecraft using CryptoLib

Software Versions:

• CryptoLib versions 1.3.3 and earlier

4. Recommended Mitigation Strategies

1. Patch Deployment:

   • Apply the latest patch from the vendor that addresses the heap buffer overflow issue. The patch can be found at the following URL: Patch.

2. Input Validation:

   • Implement robust input validation checks to ensure that the fl field and other critical parameters are within acceptable ranges before processing.

3. Network Segmentation:

   • Segment the communication network to limit the attack surface and reduce the risk of unauthorized access.

4. Intrusion Detection Systems (IDS):

   • Deploy IDS to monitor for suspicious activity and detect potential exploitation attempts.

5. Regular Security Audits:

   • Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues proactively.

5. Impact on Cybersecurity Landscape

Immediate Impact:

• The vulnerability poses a significant risk to the security and integrity of spacecraft communications, potentially leading to mission failures or data breaches.
• Organizations relying on CryptoLib for secure communications need to prioritize patching and implementing additional security measures.

Long-Term Impact:

• This incident highlights the importance of thorough security testing and validation, especially in critical systems like spacecraft communications.
• It underscores the need for continuous monitoring and updating of security protocols to address emerging threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• The vulnerability is located in the Crypto_TC_ApplySecurity function.
• The issue arises from an incomplete validation check on the fl field, which can result in a negative tf_payload_len value.
• The negative value is interpreted as a large unsigned value, leading to a heap buffer overflow during a memcpy call.

Exploitation Steps:

1. Craft a malicious frame with a carefully chosen fl value that triggers the heap buffer overflow.
2. Send the malicious frame to the spacecraft's communication system.
3. The system processes the frame, leading to a heap buffer overflow and potential remote code execution.

Mitigation Steps:

1. Code Review:

   • Review the Crypto_TC_ApplySecurity function to ensure proper validation of the fl field.
   • Implement bounds checking to prevent negative values from being interpreted as large unsigned values.

2. Memory Safety:

   • Use memory-safe functions and libraries to reduce the risk of buffer overflows.
   • Consider using tools like AddressSanitizer to detect memory errors during development.

3. Security Testing:

   • Conduct thorough security testing, including fuzz testing, to identify and mitigate similar vulnerabilities.

By addressing these technical details and implementing the recommended mitigation strategies, organizations can significantly reduce the risk posed by CVE-2025-30356 and enhance the overall security of their spacecraft communications.