CVE-2026-4631 Scanner

The Cockpit Web Console is widely used in IT environments for managing GNU/Linux servers. System administrators often leverage Cockpit due to its user-friendly web-based interface for managing system tasks. It integrates various management interfaces, allowing users to perform remote logins and manage server services efficiently. However, remote login features must be handled with caution since their misuse can lead to severe security risks. Organizations utilize Cockpit to streamline server administration across networks, making its security imperative for reducing unauthorized access threats.

Remote Code Execution (RCE) is a serious security vulnerability that allows attackers to execute arbitrary commands on a host system. In the context of Cockpit, this vulnerability arises from improper handling of input parameters during the authentication process. Such vulnerabilities can be exploited by crafting specific HTTP requests that bypass input validation and sanitization. RCE vulnerabilities, especially when associated with network-accessible web interfaces, pose critical security risks as they allow remote attackers to gain complete control over a system. Ensuring inputs are validated against malicious payloads is crucial in preventing such exploits.

The vulnerability occurs when user-supplied hostnames and usernames from Cockpit's web interface are passed to the SSH client without validation. This oversight allows attackers to inject SSH options or shell commands via a single HTTP request aimed at the login endpoint. The issue lies in the authentication flow, occurring before any credential verification, thus not requiring valid credentials. This loophole significantly increases the risk level as attackers can achieve code execution on the Cockpit host remotely. Continuous vulnerability assessments and input validation enhancements can help mitigate such issues.

Exploitation of this vulnerability can lead to full system compromise as arbitrary code execution allows attackers to manipulate the host environment as they see fit. Potential risks include unauthorized data access, server configuration changes, and launching further attacks on a network. Protecting against RCE could prevent attackers from hijacking systems for illicit activities or launching larger-scale attacks. System administrators are encouraged to patch vulnerabilities swiftly to prevent unauthorized access or data breaches.

REFERENCES

• https://github.com/cockpit-project/cockpit/security/advisories/GHSA-m4gv-x78h-3427
• https://github.com/cockpit-project/cockpit/commit/9d0695647
• https://github.com/allisonkarlitskaya/ferny/commit/44ec511c99