CVE-2023-7221 Explained : Impact and Mitigation

This is a detailed overview of CVE-2023-7221, focusing on the vulnerability found in Totolink T6 HTTP POST Request main buffer overflow.

Understanding CVE-2023-7221

CVE-2023-7221 is a critical vulnerability affecting Totolink T6 version 4.1.9cu.5241_B20210923, specifically related to the main function of the file /cgi-bin/cstecgi.cgi?action=login in the component HTTP POST Request Handler. The vulnerability allows for buffer overflow through the manipulation of the argument v41. It is important to note that this vulnerability can be exploited remotely.

What is CVE-2023-7221?

The CVE-2023-7221 vulnerability found in Totolink T6 version 4.1.9cu.5241_B20210923 allows attackers to trigger a buffer overflow by manipulating the argument v41 in the main function of the HTTP POST Request Handler component. This critical vulnerability has a base severity score of 9.8 and can be exploited remotely.

The Impact of CVE-2023-7221

The impact of CVE-2023-7221 is significant, with a base severity score of 9.8, categorizing it as critical. If exploited, attackers can execute malicious code remotely, potentially leading to unauthorized access, data theft, or service disruption.

Technical Details of CVE-2023-7221

CVE-2023-7221 affects Totolink T6 version 4.1.9cu.5241_B20210923 and involves a critical buffer overflow vulnerability in the main function of the HTTP POST Request Handler component.

Vulnerability Description

The vulnerability arises from the manipulation of the argument v41, leading to buffer overflow in the main function of /cgi-bin/cstecgi.cgi?action=login. This allows attackers to execute arbitrary code remotely.

Affected Systems and Versions

Vendor: Totolink
Product: T6
Affected Version: 4.1.9cu.5241_B20210923
Modules: HTTP POST Request Handler

Exploitation Mechanism

By sending manipulated data through the argument v41, attackers can trigger a buffer overflow exploit remotely, compromising the security of the Totolink T6 device.

Mitigation and Prevention

It is crucial to take immediate steps to address the CVE-2023-7221 vulnerability and implement long-term security practices to protect against similar exploits in the future.

Immediate Steps to Take

Update Totolink T6 to a patched version that addresses the buffer overflow vulnerability.
Restrict network access to the device to mitigate the risk of remote exploitation.
Monitor network traffic for any suspicious activity targeting the vulnerable component.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Implement network segmentation to contain and mitigate potential security breaches.
Conduct regular security assessments and penetration testing to identify and address weaknesses proactively.

Patching and Updates

Keep track of security advisories from Totolink and apply relevant patches promptly to ensure the protection of your Totolink T6 device against CVE-2023-7221 and other vulnerabilities.