CVE-2020-26124 : Exploit Details and Defense Strategies

openmediavault before 4.1.36 and 5.x before 5.5.12 allows authenticated PHP code injection attacks, via the sortfield POST parameter of rpc.php, because json_encode_safe is not used in config/databasebackend.inc. Successful exploitation allows arbitrary command execution on the underlying operating system as root.

Understanding CVE-2020-26124

This CVE involves a vulnerability in openmediavault that enables authenticated PHP code injection attacks, potentially leading to arbitrary command execution as root.

What is CVE-2020-26124?

CVE-2020-26124 is a security vulnerability in openmediavault versions before 4.1.36 and 5.x before 5.5.12 that allows attackers to execute arbitrary commands on the system as root through authenticated PHP code injection.

The Impact of CVE-2020-26124

The successful exploitation of this vulnerability can result in unauthorized individuals executing arbitrary commands on the affected system with elevated privileges, potentially leading to complete system compromise.

Technical Details of CVE-2020-26124

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability exists due to the lack of using json_encode_safe in config/databasebackend.inc, allowing attackers to inject malicious PHP code via the sortfield POST parameter of rpc.php.

Affected Systems and Versions

openmediavault versions before 4.1.36
openmediavault versions 5.x before 5.5.12

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted requests containing malicious PHP code via the sortfield POST parameter of rpc.php, leading to the execution of arbitrary commands on the system.

Mitigation and Prevention

Protecting systems from CVE-2020-26124 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update openmediavault to version 4.1.36 or 5.5.12, which contain patches addressing this vulnerability.
Monitor system logs for any suspicious activities indicating a potential exploitation attempt.

Long-Term Security Practices

Implement strong authentication mechanisms to prevent unauthorized access to the system.
Regularly audit and review PHP code for vulnerabilities and follow secure coding practices.

Patching and Updates

Apply security patches and updates provided by openmediavault promptly to mitigate the risk of exploitation.