CVE-2021-42377 : Vulnerability Insights and Analysis
Learn about CVE-2021-42377, a critical vulnerability in Busybox's hush applet, leading to denial of service and potential code execution. Find out how to mitigate risks and apply patches.
CVE-2021-42377 involves an attacker-controlled pointer free in Busybox's hush applet, potentially leading to denial of service and code execution. This vulnerability arises from a shell mishandling the '&&&' string, allowing remote code execution under specific conditions of filtered command input.
Understanding CVE-2021-42377
CVE-2021-42377 is a critical vulnerability in Busybox's hush applet with the potential for serious impact, requiring immediate attention.
What is CVE-2021-42377?
The vulnerability results from an attacker-controlled pointer free in Busybox's hush applet, leading to potential denial of service and code execution.
The Impact of CVE-2021-42377
The exploitation of this vulnerability can result in denial of service and, under specific conditions, remote code execution due to the mishandling of the '&&&' string by the shell.
Technical Details of CVE-2021-42377
This section provides specific technical details related to CVE-2021-42377.
Vulnerability Description
The vulnerability in Busybox's hush applet allows an attacker-controlled pointer free, enabling denial of service and potentially remote code execution.
Affected Systems and Versions
- Vendor: busybox
- Product: busybox
- Versions Affected: unspecified, less than 1.34.0 (custom)
Exploitation Mechanism
The exploitation occurs when processing a crafted shell command due to the mishandling of the '&&&' string, potentially leading to remote code execution.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the risks associated with CVE-2021-42377.
Immediate Steps to Take
- Apply available patches provided by Busybox promptly.
- Monitor network traffic for any suspicious activity that might indicate exploitation of this vulnerability.
- Implement strong input validation mechanisms to prevent crafted shell commands.
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities.
- Conduct security audits and penetration testing to identify and mitigate potential security risks proactively.
Patching and Updates
- Stay informed about security updates and patches released by Busybox.
- Ensure timely application of patches to secure systems against CVE-2021-42377.