Description
D-Link DIR878 DIR_878_FW120B05 was discovered to contain a stack overflow in the sub_495220 function. This vulnerability allows attackers to cause a Denial of Service (DoS) or execute arbitrary code via a crafted payload.
EPSS Score:
1%
Comprehensive Technical Analysis of EUVD-2023-28799
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2023-28799, also known as CVE-2023-24800, pertains to a stack overflow in the sub_495220 function within the D-Link DIR878 router firmware version DIR_878_FW120B05. This vulnerability is rated with a CVSS Base Score of 9.8, indicating 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 over the network.
- Attack Complexity (AC:L): Low, indicating that the attack is relatively straightforward to execute.
- Privileges Required (PR:N): None, meaning no special privileges are needed to exploit the vulnerability.
- User Interaction (UI:N): None, indicating that no user interaction is required for the attack to succeed.
- Scope (S:U): Unchanged, meaning the vulnerability does not affect resources beyond the security scope managed by the security authority.
- Confidentiality (C:H): High, indicating a complete loss of confidentiality.
- Integrity (I:H): High, indicating a complete loss of integrity.
- Availability (A:H): High, indicating a complete loss of availability.
Given these metrics, the vulnerability poses a significant risk to affected systems, allowing attackers to cause a Denial of Service (DoS) or execute arbitrary code.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector for this vulnerability is remote exploitation via crafted network packets. Attackers can exploit the stack overflow by sending specially crafted payloads to the vulnerable function sub_495220. This can lead to:
- Denial of Service (DoS): By crashing the device, rendering it unavailable.
- Arbitrary Code Execution: By injecting malicious code, allowing the attacker to take control of the device.
Exploitation methods may include:
- Network Scanning: Identifying vulnerable devices on the network.
- Payload Crafting: Developing and sending crafted packets to trigger the stack overflow.
- Exploit Kits: Utilizing pre-built exploit kits that automate the process of identifying and exploiting the vulnerability.
3. Affected Systems and Software Versions
The vulnerability specifically affects:
- D-Link DIR878 Router
- Firmware Version: DIR_878_FW120B05
Other versions of the DIR878 router and potentially other D-Link devices may also be affected if they share the same vulnerable codebase. It is crucial to verify the firmware version and apply updates as necessary.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Firmware Update: Immediately update the firmware to the latest version provided by D-Link.
- Network Segmentation: Isolate vulnerable devices on separate network segments to limit potential attack surfaces.
- Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the vulnerable function.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations and individuals using the affected D-Link DIR878 routers. The potential for remote exploitation and arbitrary code execution can lead to:
- Data Breaches: Unauthorized access to sensitive information.
- Service Disruptions: DoS attacks leading to network downtime.
- Compromised Networks: Attackers gaining control over network devices, potentially leading to further attacks within the network.
Given the widespread use of D-Link routers, the impact could be extensive, affecting both residential and commercial networks.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerable Function:
sub_495220 - Exploit Type: Stack Overflow
- Payload: Crafted network packets designed to overflow the stack buffer.
- Detection: Monitor network traffic for anomalous patterns targeting the vulnerable function. Use tools like Wireshark for packet analysis.
- Patching: Ensure that the latest firmware updates are applied. Verify the integrity of the firmware using checksums provided by D-Link.
- Logging: Enable detailed logging on the router to capture any suspicious activity. Regularly review logs for signs of exploitation attempts.
Conclusion
The vulnerability EUVD-2023-28799 (CVE-2023-24800) in the D-Link DIR878 router firmware is critical and requires immediate attention. Organizations and individuals should prioritize firmware updates and implement robust security measures to mitigate the risk. Continuous monitoring and regular security assessments are essential to maintain a secure network environment.