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Date: Wed, 06 Jul 2022 12:51:49 +0000
From: Matt Juntunen <mattjuntunen@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2022-33980: Apache Commons Configuration insecure
interpolation defaults
Severity: Moderate
Description:
Apache Commons Configuration performs variable interpolation, allowing properties to be dynamically evaluated and expanded. The standard format for interpolation is "${prefix:name}", where "prefix" is used to locate an instance of org.apache.commons.configuration2.interpol.Lookup that performs the interpolation. Starting with version 2.4 and continuing through 2.7, the set of default Lookup instances included interpolators that could result in arbitrary code execution or contact with remote servers. These lookups are:
- "script" - execute expressions using the JVM script execution engine (javax.script)
- "dns" - resolve dns records
- "url" - load values from urls, including from remote servers
Applications using the interpolation defaults in the affected versions may be vulnerable to remote code execution or unintentional contact with remote servers if untrusted configuration values are used.
Users are recommended to upgrade to Apache Commons Configuration 2.8.0, which disables the problematic interpolators by default.
Mitigation:
Upgrade to version Apache Commons Configuration 2.8.0
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