CVE-2024-45158

Comprehensive Technical Analysis of CVE-2024-45158

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-45158 CVSS Score: 9.8

The vulnerability in Mbed TLS 3.6 before 3.6.1 involves a stack buffer overflow in the functions mbedtls_ecdsa_der_to_raw() and mbedtls_ecdsa_raw_to_der(). This issue arises when the bits parameter exceeds the largest supported curve, leading to a potential buffer overflow. The severity of this vulnerability is rated as critical (CVSS Score: 9.8) due to the potential for remote code execution, denial of service, or information disclosure.

2. Potential Attack Vectors and Exploitation Methods

• Remote Code Execution (RCE): An attacker could craft a malicious input that triggers the buffer overflow, potentially allowing them to execute arbitrary code on the affected system.
• Denial of Service (DoS): The buffer overflow could cause the application to crash, leading to a denial of service.
• Information Disclosure: The overflow might allow an attacker to read sensitive information from the stack, leading to information disclosure.

Exploitation Methods:

• Direct Function Calls: Applications that directly call the vulnerable functions (mbedtls_ecdsa_der_to_raw() and mbedtls_ecdsa_raw_to_der()) with a large bits parameter are at risk.
• Crafted Inputs: An attacker could send specially crafted inputs to applications that use these functions, exploiting the vulnerability.

3. Affected Systems and Software Versions

• Mbed TLS Versions: All versions of Mbed TLS 3.6 before 3.6.1 are affected.
• Configurations: Systems with PSA (Platform Security Architecture) disabled are particularly vulnerable.
• Applications: Any application that directly calls the vulnerable functions and does not validate the bits parameter is at risk.

4. Recommended Mitigation Strategories

• Update Mbed TLS: Upgrade to Mbed TLS version 3.6.1 or later, which includes a fix for this vulnerability.
• Input Validation: Ensure that applications validate the bits parameter before calling the vulnerable functions.
• Enable PSA: If possible, enable PSA to mitigate the risk.
• Monitoring and Logging: Implement monitoring and logging to detect any unusual activity that may indicate an attempt to exploit this vulnerability.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the importance of thorough input validation and the risks associated with buffer overflows in cryptographic libraries. It underscores the need for regular updates and patches in security-critical software. The high CVSS score indicates the potential for significant impact if exploited, emphasizing the urgency for organizations to address this vulnerability promptly.

6. Technical Details for Security Professionals

Vulnerable Functions:

• mbedtls_ecdsa_der_to_raw()
• mbedtls_ecdsa_raw_to_der()

Trigger Condition:

• The bits parameter exceeds the largest supported curve.

Mitigation Steps:

1. Update Mbed TLS: Ensure that all systems using Mbed TLS are updated to version 3.6.1 or later.
2. Input Validation: Implement strict validation checks on the bits parameter to ensure it does not exceed the supported range.
3. Code Review: Conduct a thorough code review of applications that use Mbed TLS to identify and mitigate any direct calls to the vulnerable functions.
4. Enable PSA: If applicable, enable PSA to add an additional layer of security.
5. Monitoring: Deploy intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for any suspicious activity related to this vulnerability.

References:

• Mbed TLS Release Notes
• Mbed TLS Security Advisories
• Specific Advisory for CVE-2024-45158

By addressing this vulnerability promptly and thoroughly, organizations can significantly reduce the risk of exploitation and maintain the integrity and security of their systems.