CVE-2021-40348 : Security Advisory and Response

This CVE-2021-40348 article provides details about a code injection vulnerability in Spacewalk 2.10 and derivatives such as Uyuni 2021.08 that allows attackers to append arbitrary code to files.

Understanding CVE-2021-40348

This section explains the vulnerability, its impact, technical details, and mitigation steps.

What is CVE-2021-40348?

Spacewalk 2.10 and Uyuni 2021.08 are vulnerable to code injection due to improper filename sanitization, allowing attackers to inject malicious code.

The Impact of CVE-2021-40348

The vulnerability enables attackers to execute arbitrary code within the system, potentially leading to unauthorized access and privilege escalation.

Technical Details of CVE-2021-40348

This section covers specific technical information about the vulnerability.

Vulnerability Description

Spacewalk and Uyuni are susceptible to a code injection flaw where the rhn-config-satellite.pl script does not properly sanitize filenames, permitting unauthorized code execution.

Affected Systems and Versions

Affected versions: Spacewalk 2.10, Uyuni 2021.08
Fixed version: Uyuni spacewalk-admin 4.3.2-1

Exploitation Mechanism

Attackers can exploit this vulnerability by appending malicious code through the --option, leading to code execution as the root user.

Mitigation and Prevention

Learn about steps to mitigate and prevent the CVE-2021-40348 vulnerability.

Immediate Steps to Take

Apply the Uyuni spacewalk-admin 4.3.2-1 update immediately.
Restrict script execution permissions to prevent unauthorized access.

Long-Term Security Practices

Regularly update and patch Spacewalk and Uyuni installations.
Implement least privilege access to limit the impact of potential vulnerabilities.
Conduct security audits and code reviews to identify and address similar issues.
Monitor system logs for any suspicious activities.

Patching and Updates

Ensure timely installation of security updates and patches provided by Uyuni to address known vulnerabilities.