CVE-2021-33393 : Security Advisory and Response
Learn about CVE-2021-33393 affecting IPFire 2.25-core155. Understand the impact, technical details, and mitigation steps for this security vulnerability.
This CVE-2021-33393 impacts IPFire 2.25-core155 due to a vulnerability in the lfs/backup feature. Attackers may exploit this issue to execute malicious scripts with root privileges. Here's what you need to know about CVE-2021-33393.
Understanding CVE-2021-33393
This section provides insights into the vulnerability and its potential impact on affected systems.
What is CVE-2021-33393?
The lfs/backup component in IPFire 2.25-core155 fails to verify the ownership of critical files, making it possible for unauthorized users to upload malicious scripts.
The Impact of CVE-2021-33393
The vulnerability allows threat actors to plant a Trojan horse script that could be later executed with elevated privileges, posing a severe security risk to the system.
Technical Details of CVE-2021-33393
Delve into the technical aspects of CVE-2021-33393 to understand its intricacies.
Vulnerability Description
IPFire 2.25-core155 does not enforce proper ownership of the /var/ipfire/backup/bin/backup.pl file, leaving it susceptible to unauthorized modifications.
Affected Systems and Versions
All instances of IPFire 2.25-core155 are affected by this vulnerability due to inadequate file ownership validation.
Exploitation Mechanism
Malicious actors can exploit this flaw by uploading a compromised backup.pl script via the lfs/backup feature to execute arbitrary code as the root user.
Mitigation and Prevention
Discover the necessary steps to safeguard your systems and mitigate the risks associated with CVE-2021-33393.
Immediate Steps to Take
Ensure that all files in the /var/ipfire/backup/bin/ directory are owned by the root account to prevent unauthorized script execution.
Long-Term Security Practices
Implement strict file permission policies and regularly monitor and audit file ownership to detect any unauthorized changes.
Patching and Updates
Apply the latest patches and updates provided by IPFire to address this vulnerability and enhance the security of your IPFire installation.