Description
CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures (SDLS-EP) to secure communications between a spacecraft running the core Flight System (cFS) and a ground station. In 1.3.3 and earlier, a heap buffer overflow vulnerability persists in the Crypto_TC_ApplySecurity function due to an incomplete validation check on the fl (frame length) field. Although CVE-2025-29912 addressed an underflow issue involving fl, the patch fails to fully prevent unsafe calculations. As a result, an attacker can still craft malicious frames that cause a negative tf_payload_len, which is then interpreted as a large unsigned value, leading to a heap buffer overflow in a memcpy call.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-9499
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-9499 pertains to a heap buffer overflow in the CryptoLib software, specifically within the Crypto_TC_ApplySecurity function. This issue arises due to an incomplete validation check on the fl (frame length) field, which can lead to unsafe calculations and subsequent buffer overflows. The vulnerability has a CVSS Base Score of 9.3, indicating a critical severity level. The 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 highlights the following characteristics:
- Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
- Attack Complexity (AC): Low (L) - The attack requires low complexity to exploit.
- Authentication (AT): None (N) - No authentication is required to exploit the vulnerability.
- Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required to exploit the vulnerability.
- Confidentiality (VC): High (H) - The vulnerability has a high impact on confidentiality.
- Integrity (VI): High (H) - The vulnerability has a high impact on integrity.
- Availability (VA): High (H) - The vulnerability has a high impact on availability.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector involves crafting malicious frames that exploit the incomplete validation of the fl field. An attacker can send specially crafted frames to the spacecraft, causing a negative tf_payload_len value, which is then interpreted as a large unsigned value. This results in a heap buffer overflow during a memcpy call, potentially leading to arbitrary code execution or denial of service (DoS).
Exploitation methods may include:
- Remote Code Execution (RCE): By overwriting critical memory areas, an attacker could execute arbitrary code on the spacecraft.
- Denial of Service (DoS): The buffer overflow could crash the spacecraft's communication system, leading to a loss of communication with the ground station.
- Data Corruption: The attacker could manipulate data in memory, leading to incorrect data processing and potential mission failure.
3. Affected Systems and Software Versions
The vulnerability affects CryptoLib versions 1.3.3 and earlier. Systems running the core Flight System (cFS) and utilizing CryptoLib for secure communications between spacecraft and ground stations are at risk. This includes:
- Spacecraft running cFS: Any spacecraft using CryptoLib for secure communications.
- Ground Stations: Systems that communicate with spacecraft using CryptoLib.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Patch Management: Upgrade CryptoLib to a version that includes a comprehensive fix for the validation check on the
flfield. - Input Validation: Implement additional input validation checks to ensure that the
flfield is within acceptable bounds before processing. - Network Segmentation: Segregate critical communication networks to limit the attack surface.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for unusual traffic patterns that may indicate an exploitation attempt.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential weaknesses.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to European space missions and satellite communications. Given the critical nature of space operations, a successful exploitation could lead to:
- Loss of Mission Data: Compromised communications could result in the loss of valuable scientific data.
- Operational Disruptions: Disruptions in communication could affect mission operations, leading to delays or failures.
- National Security Risks: Compromised satellite communications could have implications for national security, particularly for military and intelligence operations.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerable Function:
Crypto_TC_ApplySecurity - Affected Field:
fl(frame length) - Root Cause: Incomplete validation check on the
flfield leading to unsafe calculations and heap buffer overflow. - Exploitation Mechanism: Crafting malicious frames to induce a negative
tf_payload_len, interpreted as a large unsigned value, causing a buffer overflow inmemcpy. - References:
Conclusion
The vulnerability described in EUVD-2025-9499 is critical and requires immediate attention from organizations utilizing CryptoLib for secure space communications. Implementing the recommended mitigation strategies and ensuring robust input validation can significantly reduce the risk of exploitation. Continuous monitoring and regular security assessments are essential to maintain the integrity and security of space missions.