Description
Tenda AC10 US_AC10V4.0si_V16.03.10.13_cn was discovered to contain a stack overflow via the R7WebsSecurityHandler 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-2023-30806
1. Vulnerability Assessment and Severity Evaluation
The vulnerability identified as EUVD-2023-30806 (also known as CVE-2023-27016 and GSD-2023-27016) pertains to a stack overflow in the R7WebsSecurityHandler function within the Tenda AC10 US_AC10V4.0si_V16.03.10.13_cn firmware. 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 over the network.
- Attack Complexity (AC:L): The attack requires low complexity.
- 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): High impact on confidentiality.
- Integrity (I:H): High impact on integrity.
- Availability (A:H): High impact on availability.
2. Potential Attack Vectors and Exploitation Methods
The stack overflow vulnerability in the R7WebsSecurityHandler function can be exploited through crafted payloads sent over the network. Potential attack vectors include:
- Network-Based Attacks: An attacker can send specially crafted packets to the vulnerable device, causing a stack overflow.
- Web-Based Attacks: If the device has a web interface, an attacker could exploit the vulnerability through crafted HTTP requests.
- Malicious Firmware Updates: An attacker could potentially exploit the vulnerability by sending malicious firmware updates.
Exploitation methods may involve:
- Buffer Overflow: Sending a payload that exceeds the buffer size allocated for the R7WebsSecurityHandler function.
- Code Execution: Injecting malicious code into the stack, leading to arbitrary code execution.
- Denial of Service (DoS): Causing the device to crash or become unresponsive.
3. Affected Systems and Software Versions
The vulnerability specifically affects the Tenda AC10 router with the firmware version US_AC10V4.0si_V16.03.10.13_cn. Other versions of the Tenda AC10 firmware may also be affected, but this has not been confirmed. Users and administrators should verify the firmware version of their devices to determine if they are at risk.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Firmware Update: Immediately update the firmware to a version that addresses this vulnerability. Tenda should provide a patched version as soon as possible.
- Network Segmentation: Isolate the affected devices on a separate network segment to limit exposure.
- 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 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 risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected Tenda AC10 routers. The potential for remote code execution and DoS attacks can lead to data breaches, service disruptions, and other security incidents. Given the widespread use of routers in both home and enterprise environments, 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: R7WebsSecurityHandler
- Exploit Mechanism: Stack overflow via crafted payloads
- Impact: Arbitrary code execution, DoS
- Detection: Monitor network traffic for unusual patterns targeting the R7WebsSecurityHandler function.
- Mitigation: Implement network-level protections and ensure firmware updates are applied.
References:
By addressing this vulnerability promptly and implementing robust mitigation strategies, organizations can significantly reduce the risk of exploitation and maintain the integrity and availability of their networked devices.