CVE-2021-23394 : Exploit Details and Defense Strategies
Learn about CVE-2021-23394, a critical Remote Code Execution (RCE) vulnerability in studio-42/elfinder affecting versions < 2.1.58. Understand the impact and mitigation steps.
A detailed overview of the Remote Code Execution (RCE) vulnerability identified in the studio-42/elfinder package before version 2.1.58.
Understanding CVE-2021-23394
This section delves into the specifics of the CVE-2021-23394 vulnerability.
What is CVE-2021-23394?
The package studio-42/elfinder before 2.1.58 is susceptible to Remote Code Execution (RCE) through PHP code execution in a .phar file, specifically affecting servers that interpret .phar files as PHP.
The Impact of CVE-2021-23394
The vulnerability poses a significant risk with a high CVSS base score of 8.1, impacting confidentiality, integrity, and availability, without requiring any specific privileges for exploitation.
Technical Details of CVE-2021-23394
In-depth technical insights into the CVE-2021-23394 vulnerability.
Vulnerability Description
The vulnerability allows threat actors to execute arbitrary PHP code via a .phar file, leading to potential Remote Code Execution.
Affected Systems and Versions
Only versions of studio-42/elfinder that are less than 2.1.58 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit this flaw through the execution of malicious PHP code within a .phar file, taking advantage of servers that treat .phar files as PHP.
Mitigation and Prevention
Strategies to mitigate the risks associated with CVE-2021-23394.
Immediate Steps to Take
- Update the studio-42/elfinder package to version 2.1.58 or higher to eliminate the vulnerability.
- Disable the execution of .phar files as PHP on web servers for enhanced security.
Long-Term Security Practices
- Regularly monitor for security advisories and updates related to studio-42/elfinder to stay informed about potential vulnerabilities.
- Implement robust web application firewalls and security mechanisms to prevent unauthorized access.
Patching and Updates
Keep software and dependencies up to date, apply security patches promptly, and conduct routine security audits to identify and address vulnerabilities effectively.