CVE-2021-3725 : What You Need to Know
Discover the details of CVE-2021-3725, a high-severity OS Command Injection vulnerability in ohmyzsh/ohmyzsh's dirhistory plugin. Learn about impacts, affected systems, exploitation, and mitigation steps.
Oh My Zsh, specifically the dirhistory plugin, is affected by a vulnerability allowing command injection when navigating directory history. This issue could lead to unauthorized access and control of the system.
Understanding CVE-2021-3725
This CVE concerns an OS Command Injection vulnerability in the ohmyzsh/ohmyzsh repository, impacting systems using the dirhistory plugin.
What is CVE-2021-3725?
The vulnerability involves functions pop_past and pop_future in the dirhistory plugin, allowing malicious commands to be injected via directory names when certain key combinations are pressed.
The Impact of CVE-2021-3725
With a CVSS base score of 7.5, this high-severity vulnerability could result in unauthorized execution of commands, potentially leading to system compromise and data theft.
Technical Details of CVE-2021-3725
This section provides an overview of the technical aspects related to CVE-2021-3725.
Vulnerability Description
The widgets in the directory history plugin execute eval on directory names unsafely, enabling command injection upon navigating directory history.
Affected Systems and Versions
Among the affected systems is the ohmyzsh/ohmyzsh repository with versions less than 06fc5fb, particularly systems with the dirhistory plugin enabled.
Exploitation Mechanism
By creating a directory with a malicious name and pressing specific key combinations, an attacker can trigger command execution that compromises system integrity and confidentiality.
Mitigation and Prevention
To address CVE-2021-3725, immediate actions and long-term security practices are crucial.
Immediate Steps to Take
Users should disable the dirhistory plugin, update to a non-vulnerable version, and avoid navigating directory history until the issue is resolved.
Long-Term Security Practices
Employ secure coding practices, regularly update software, and educate users on security best practices to prevent similar vulnerabilities.
Patching and Updates
Check for patched versions, apply security updates promptly, and monitor official sources for any further patches or advisories.