CVE-2020-7626

Vulnerability

Overview

karma-mojo, a Karma plugin that allows running a subset of tests, is vulnerable to command injection in versions through 1.0.1. The config argument received by the reporter is passed to functions without proper sanitization, enabling an attacker to inject arbitrary commands that are executed by the system shell. The root cause is insufficient input validation on the grep property of the config object, which is directly concatenated into a command string [1][2][3].

Exploitation

An attacker can control the config object passed to the plugin, specifically the grep field. By providing a malicious string like "& touch Song", the injected command will be executed when the plugin constructs a shell command. The proof of concept provided by Snyk demonstrates that no authentication or special privileges are required beyond the ability to influence the configuration parameters passed to karma-mojo [1].

Impact

Successful exploitation allows an attacker to execute arbitrary commands on the system running karma-mojo. This could lead to full compromise of the testing environment, data exfiltration, or lateral movement within the CI/CD pipeline. The attack surface is increased when the vulnerable package is used in automated test suites that accept external configuration.

Mitigation

As of the publication date, there is no patched version available for karma-mojo. The project appears to be abandoned or unmaintained. The only recommended mitigation is to avoid using this package or to fork it and implement proper input sanitization. Users should also ensure that untrusted input cannot influence the configuration passed to the plugin [1][2].