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
