Description
An issue was discovered on GL.iNet devices before 3.216. The function guci2_get() found in libglutil.so has a buffer overflow when an item is requested from a UCI context, and the value is pasted into a char pointer to a buffer without checking the size of the buffer.
EPSS Score:
1%
Comprehensive Technical Analysis of EUVD-2023-35780
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2023-35780, also known as CVE-2023-31475, is a buffer overflow issue discovered in GL.iNet devices before version 3.216. The function guci2_get() in the library libglutil.so does not properly check the size of the buffer when copying data from a UCI context, leading to a potential buffer overflow.
Severity Evaluation:
- Base Score: 9.8 (Critical)
- Base Score Version: CVSS 3.1
- Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high base score indicates that this vulnerability is critical. The CVSS vector breakdown shows that the vulnerability can be exploited remotely (AV:N), requires low attack complexity (AC:L), does not need any privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Exploitation: An attacker can exploit this vulnerability over the network without needing physical access to the device.
- Unauthenticated Access: The attacker does not need any special privileges or user interaction to exploit the vulnerability.
Exploitation Methods:
- Buffer Overflow: By sending a specially crafted request to the device, an attacker can cause a buffer overflow in the
guci2_get()function. - Code Execution: The buffer overflow can potentially lead to arbitrary code execution, allowing the attacker to take control of the device.
- Denial of Service (DoS): The attacker can also cause the device to crash, leading to a denial of service.
3. Affected Systems and Software Versions
Affected Systems:
- GL.iNet devices running firmware versions before 3.216.
Software Versions:
- The vulnerability is present in the
libglutil.solibrary, specifically in theguci2_get()function.
4. Recommended Mitigation Strategies
Immediate Mitigation:
- Update Firmware: Upgrade GL.iNet devices to firmware version 3.216 or later, which includes the patch for this vulnerability.
- Network Segmentation: Isolate GL.iNet devices from untrusted networks to reduce the risk of remote exploitation.
- Firewall Rules: Implement strict firewall rules to limit access to the device.
Long-Term Mitigation:
- Regular Patching: Ensure that all devices are regularly updated with the latest security patches.
- Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential vulnerabilities.
- Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity.
5. Impact on European Cybersecurity Landscape
The vulnerability affects GL.iNet devices, which are widely used in various sectors, including home networks, small businesses, and IoT deployments. The critical nature of the vulnerability poses a significant risk to the European cybersecurity landscape, particularly in environments where these devices are used for critical operations.
Potential Impacts:
- Data Breaches: Unauthorized access to sensitive data.
- Service Disruptions: Denial of service attacks leading to operational disruptions.
- Compromised IoT Networks: Potential compromise of IoT networks, leading to broader security issues.
6. Technical Details for Security Professionals
Vulnerability Details:
- Function:
guci2_get()inlibglutil.so - Issue: Buffer overflow when copying data from a UCI context without checking the buffer size.
- Exploitation: Crafted requests can lead to buffer overflow, potentially resulting in arbitrary code execution or denial of service.
References:
Additional Considerations:
- Code Review: Conduct a thorough code review of the
libglutil.solibrary to identify and fix similar issues. - Fuzz Testing: Implement fuzz testing to detect potential buffer overflow vulnerabilities in other parts of the codebase.
- Secure Coding Practices: Ensure that all developers follow secure coding practices to prevent buffer overflow vulnerabilities in future releases.
By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their networks from potential attacks.