EUVD-2024-35193

Comprehensive Technical Analysis of EUVD-2024-35193

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-35193 pertains to a stack overflow in the TOTOLINK LR350 V9.3.5u.6698_B20230810 firmware, specifically within the loginAuth function when handling the password parameter. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV:N): Network, meaning the vulnerability is exploitable remotely.
• Attack Complexity (AC:L): Low, indicating that the attack does not require specialized conditions.
• Privileges Required (PR:N): None, meaning no privileges are needed to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect resources beyond the security scope managed by the security authority.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

This high score underscores the critical nature of the vulnerability, which can lead to severe consequences if exploited.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability in the loginAuth function can be exploited through the following methods:

• Remote Exploitation: An attacker can send a specially crafted password parameter via network requests to the device, causing a stack overflow.
• Buffer Overflow: By sending an excessively long password, the attacker can overwrite the stack, potentially leading to arbitrary code execution.
• Denial of Service (DoS): The stack overflow can crash the device, leading to a denial of service.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Device: TOTOLINK LR350
• Firmware Version: V9.3.5u.6698_B20230810

Other versions of the firmware and similar devices should be checked for similar vulnerabilities.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following steps should be taken:

• Firmware Update: Immediately update the firmware to a patched version once available.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit exposure.
• Input Validation: Implement strict input validation for the password parameter to prevent overly long inputs.
• Monitoring: Increase monitoring of network traffic to and from the affected devices to detect any suspicious activity.
• Access Control: Limit access to the device to trusted users and networks.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the TOTOLINK LR350 device. The potential for remote exploitation and high impact on confidentiality, integrity, and availability makes it a critical concern. Organizations should prioritize patching and mitigation efforts to prevent potential breaches and data loss.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Stack Overflow
• Affected Function: loginAuth
• Parameter: Password
• Exploitation: Remote, via network requests
• Impact: Arbitrary code execution, denial of service
• Mitigation: Firmware update, input validation, network segmentation, increased monitoring

References:

• GitHub Repository

Aliases:

• CVE-2024-35099

Assigner:

• Mitre

EPSS:

• N/A

ENISA ID Product:

• [{"id":"824f52c5-1cdc-3f86-a650-85776fe75b4c","product":{"name":"n/a"},"product_version":"n/a"}]

ENISA ID Vendor:

• [{"id":"32f05a6a-f83c-3209-8791-0b03eee716e9","vendor":{"name":"n/a"}}]

This comprehensive analysis should aid cybersecurity professionals in understanding the severity and implications of the vulnerability, as well as the necessary steps to mitigate the risk effectively.