Description
A vulnerability, which was classified as critical, has been found in Totolink A7100RU 7.4cu.2313_B20191024. Affected by this issue is the function main of the file /cgi-bin/cstecgi.cgi?action=login of the component HTTP POST Request Handler. The manipulation of the argument flag leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-248942 is the identifier assigned to this vulnerability.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2023-59279
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2023-59279, also known as CVE-2023-7095, is classified as critical with a CVSS Base Score of 9.8. This high score indicates a severe vulnerability that poses significant risk. 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:
- AV:N - Attack Vector: Network, meaning the vulnerability can be exploited remotely.
- AC:L - Attack Complexity: Low, indicating that the attack is relatively easy to execute.
- PR:N - Privileges Required: None, meaning no special privileges are needed to exploit the vulnerability.
- UI:N - User Interaction: None, indicating that no user interaction is required for the attack to succeed.
- S:U - Scope: Unchanged, meaning the vulnerability does not affect other security scopes.
- C:H - Confidentiality: High, indicating a complete breach of confidentiality.
- I:H - Integrity: High, indicating a complete breach of integrity.
- A:H - Availability: High, indicating a complete breach of availability.
The severity of this vulnerability is further underscored by its public disclosure and the availability of exploit code, which increases the likelihood of exploitation.
2. Potential Attack Vectors and Exploitation Methods
The vulnerability resides in the HTTP POST Request Handler of the Totolink A7100RU router, specifically in the main function of the /cgi-bin/cstecgi.cgi?action=login file. The manipulation of the flag argument leads to a buffer overflow, which can be exploited remotely.
Potential attack vectors include:
- Remote Code Execution (RCE): An attacker could send a specially crafted HTTP POST request to the vulnerable endpoint, causing a buffer overflow that could lead to arbitrary code execution.
- Denial of Service (DoS): The buffer overflow could also be used to crash the device, leading to a denial of service.
- Data Exfiltration: The attacker could potentially exfiltrate sensitive data from the device, including configuration settings and user credentials.
3. Affected Systems and Software Versions
The vulnerability affects the Totolink A7100RU router, specifically version 7.4cu.2313_B20191024. It is crucial to note that other versions of the A7100RU router may also be affected if they share the same vulnerable codebase.
4. Recommended Mitigation Strategies
To mitigate the risk posed by this vulnerability, the following strategies are recommended:
- Patch Management: Ensure that the router firmware is updated to the latest version provided by Totolink. If a patch is not available, consider reaching out to the vendor for a timeline.
- Network Segmentation: Isolate the affected device from critical networks to limit the potential impact of an attack.
- Access Control: Implement strict access controls to limit who can access the device's management interface.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity targeting the vulnerable endpoint.
- Firewall Rules: Implement firewall rules to block unauthorized access to the device's management interface.
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 Totolink A7100RU routers. Given the critical nature of the vulnerability and the ease of exploitation, there is a high potential for widespread impact, including data breaches, service disruptions, and unauthorized access to networks.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerable Endpoint:
/cgi-bin/cstecgi.cgi?action=login - Vulnerable Argument:
flag - Exploit Type: Buffer Overflow
- Exploit Availability: Publicly disclosed and available
- References:
Security professionals should prioritize the identification and remediation of this vulnerability in their environments. Regular monitoring and auditing of network devices, along with prompt application of vendor-provided patches, are essential to maintaining a robust security posture.
Conclusion
EUVD-2023-59279 represents a critical vulnerability in the Totolink A7100RU router that requires immediate attention. The potential for remote exploitation, coupled with the availability of exploit code, underscores the urgency of implementing mitigation strategies. Organizations and individuals should take proactive measures to protect their networks and data from potential attacks leveraging this vulnerability.