Description
Tenda AC5 US_AC5V1.0RTL_V15.03.06.28 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-2023-29174
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2023-29174, also known as CVE-2023-25211, involves a stack overflow in the R7WebsSecurityHandler function within the Tenda AC5 US_AC5V1.0RTL_V15.03.06.28 firmware. This vulnerability is critical due to its potential to cause a Denial of Service (DoS) or allow for arbitrary code execution via a crafted payload.
Severity Evaluation:
- CVSS Base Score: 9.8
- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high CVSS score of 9.8 indicates a critical vulnerability. The vector string details the following:
- AV:N (Network Vector): The vulnerability is exploitable over the network.
- AC:L (Low Complexity): The attack requires low skill or resources.
- PR:N (No Privileges Required): No privileges are needed to exploit the vulnerability.
- UI:N (No User Interaction): No user interaction is required.
- S:U (Unchanged): The impact does not change even if the vulnerability is exploited.
- C:H (High Confidentiality Impact): Complete loss of confidentiality.
- I:H (High Integrity Impact): Complete loss of integrity.
- A:H (High Availability Impact): Complete loss of availability.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Network-Based Attacks: Given the network vector (AV:N), attackers can exploit this vulnerability remotely over the network.
- Crafted Payloads: Attackers can send specially crafted packets to the R7WebsSecurityHandler function to trigger the stack overflow.
Exploitation Methods:
- DoS Attacks: By sending malformed packets, attackers can cause the device to crash, leading to a Denial of Service.
- Arbitrary Code Execution: More sophisticated attackers can craft payloads that execute arbitrary code, potentially leading to full device compromise.
3. Affected Systems and Software Versions
Affected Systems:
- Tenda AC5 devices running firmware version US_AC5V1.0RTL_V15.03.06.28.
Software Versions:
- Specifically, the vulnerability affects the R7WebsSecurityHandler function within the mentioned firmware version.
4. Recommended Mitigation Strategies
Immediate Actions:
- Firmware Update: Ensure that all Tenda AC5 devices are updated to the latest firmware version that addresses this vulnerability.
- Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
- Firewall Rules: Implement strict firewall rules to block unauthorized access to the device.
Long-Term Strategies:
- Regular Patch Management: Establish a routine for regularly updating firmware and software.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity.
- Security Audits: Conduct regular security audits to identify and mitigate vulnerabilities.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to European organizations and individuals using Tenda AC5 devices. Given the widespread use of such devices in both home and enterprise environments, the potential for large-scale disruptions and data breaches is high. The critical nature of the vulnerability underscores the need for robust cybersecurity measures and continuous monitoring.
6. Technical Details for Security Professionals
Vulnerability Details:
- Function Affected: R7WebsSecurityHandler
- Type of Vulnerability: Stack Overflow
- Exploitation: Crafted payloads can trigger the overflow, leading to DoS or arbitrary code execution.
Detection and Response:
- Log Analysis: Monitor logs for unusual activity or error messages related to the R7WebsSecurityHandler function.
- Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.
- Patch Management: Ensure that all devices are updated to the latest firmware version that includes the fix for this vulnerability.
References:
Conclusion: EUVD-2023-29174 is a critical vulnerability that requires immediate attention from cybersecurity professionals. By understanding the technical details and implementing the recommended mitigation strategies, organizations can significantly reduce the risk of exploitation and ensure the security of their networks.