Exploring CVE-2022-33980: the Apache Commons configuration RCE vulnerability
Blog post from Snyk
Apache Commons Configuration versions 2.4 through 2.7 may allow arbitrary code execution when attacker-controlled configuration values are processed through its default variable interpolation feature, particularly via enabled URL, DNS, and script lookup prefixes. Although the issue is characterized as configuration manipulation rather than a Log4Shell-scale vulnerability, malicious configurations or compromised dynamic resources could load remote content, execute scripts, and potentially enable lateral movement across a network. Java 8 through 15 installations are especially relevant because they commonly included the Nashorn scripting engine, which could execute JavaScript or Java-based commands through interpolation, while later Java versions require a separately supplied script engine. Version 2.8 and later mitigates the risk by disabling URL, DNS, and script prefixes by default, and organizations are advised to sanitize configuration inputs, monitor ownership and expiration of referenced domains, upgrade affected dependencies, use supported Java releases, and scan applications for vulnerable versions.
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