Description
D-Link DIR878 1.30B08 was discovered to contain a stack overflow in the sub_48d630 function. This vulnerability allows attackers to cause a Denial of Service (DoS) or execute arbitrary code via a crafted payload.
EPSS Score:
3%
Comprehensive Technical Analysis of EUVD-2023-31456
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2023-31456, also known as CVE-2023-27720, pertains to a stack overflow in the sub_48d630 function within the D-Link DIR878 firmware version 1.30B08. This vulnerability is critical, with a CVSS Base Score of 9.8, indicating a high risk to affected systems. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:
- Attack Vector (AV:N): The vulnerability can be exploited remotely over the network.
- Attack Complexity (AC:L): The attack requires low complexity to exploit.
- Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
- User Interaction (UI:N): No user interaction is required.
- Scope (S:U): The vulnerability does not change the security scope.
- Confidentiality (C:H): The vulnerability has a high impact on confidentiality.
- Integrity (I:H): The vulnerability has a high impact on integrity.
- Availability (A:H): The vulnerability has a high impact on availability.
2. Potential Attack Vectors and Exploitation Methods
The stack overflow vulnerability in the sub_48d630 function can be exploited through crafted payloads sent to the device. Potential attack vectors include:
- Remote Exploitation: An attacker can send specially crafted network packets to the D-Link DIR878 router, causing a stack overflow.
- Denial of Service (DoS): The stack overflow can lead to a crash, resulting in a DoS condition where the device becomes unresponsive.
- Arbitrary Code Execution: By carefully crafting the payload, an attacker can execute arbitrary code on the device, potentially leading to full system compromise.
3. Affected Systems and Software Versions
The vulnerability specifically affects:
- D-Link DIR878 firmware version 1.30B08.
Other versions of the DIR878 firmware and other D-Link models may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their devices 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 D-Link DIR878 to the latest firmware version provided by D-Link.
- Network Segmentation: Isolate the affected device on a separate network segment to limit potential attack vectors.
- Firewall Rules: Implement strict firewall rules to restrict access to the device from untrusted networks.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network traffic targeting the DIR878.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk 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, and service disruptions. Given the widespread use of D-Link routers, the impact could be extensive if not addressed promptly.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerable Function: The
sub_48d630function in the DIR878 firmware is susceptible to a stack overflow. - Exploitation: The vulnerability can be triggered by sending a crafted payload that exceeds the buffer size allocated for the function.
- Payload Crafting: The payload should be designed to overwrite the return address on the stack, allowing for code execution or causing a crash.
- Detection: Monitor network traffic for unusual patterns targeting the DIR878, such as large or malformed packets.
- Patch Analysis: Review the patch provided by D-Link to understand the changes made to mitigate the vulnerability.
Conclusion
EUVD-2023-31456 is a critical vulnerability affecting D-Link DIR878 routers running firmware version 1.30B08. The stack overflow in the sub_48d630 function can lead to DoS conditions or arbitrary code execution, posing a significant risk to affected systems. Immediate mitigation through firmware updates and network security measures is essential to protect against potential exploitation. Security professionals should remain vigilant and proactive in addressing this vulnerability to safeguard the European cybersecurity landscape.