Peter Palaga created XALANJ-2664:
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Summary: The new class loading check in 2.7.3 does not work if
Xalan was not loaded using System Class Loader
Key: XALANJ-2664
URL: https://issues.apache.org/jira/browse/XALANJ-2664
Project: XalanJ2
Issue Type: Bug
Security Level: No security risk; visible to anyone (Ordinary problems in
Xalan projects. Anybody can view the issue.)
Components: Xalan
Affects Versions: 2.7.3
Reporter: Peter Palaga
Assignee: Gary D. Gregory
The latest version 2.7.3 of Xalan now tries to load the translet class right
after generating it to prevent CVE-2022-34169 (integer truncation issue when
processing malicious XSLT stylesheets). It does so using a simplistic ad hoc
class loaded implemented as follows:
{code}
public class ByteArrayClassLoader extends ClassLoader {
byte[] ba;
public ByteArrayClassLoader(byte[] bArray) {
ba = bArray;
}
public Class findClass(String name) {
return defineClass(name, ba, 0, ba.length);
}
}
{code}
Note that it delegates to the default parent constructor {{ClassLoader()}}
which in turn delegates to {{this(checkCreateClassLoader(), null,
getSystemClassLoader())}}.
This works well as long as Xalan classes were loaded using the System Class
Loader. However, if they were loaded differently, the class loading check fails
due to the fact that {{org.apache.xalan.xsltc.runtime.AbstractTranslet}} the
parent class of the generated translet cannot be found.
This is the case e.g. in during Quarkus build phase, where Quarkus Maven plugin
sets up a custom class loader hierarchy for building the application.
h3. Solution proposal
Making the ByteArrayClassLoader use the Current Thread Context Class Loader
fixes the issue for us and I wonder whether that's a viable fix for the project
maintainers?
{code}
public class ByteArrayClassLoader extends ClassLoader {
byte[] ba;
public ByteArrayClassLoader(byte[] bArray) {
super(Thread.currentThread().getContextClassLoader() != null ?
Thread.currentThread().getContextClassLoader() : XSLTC.class.getClassLoader())
ba = bArray;
}
public Class findClass(String name) {
return defineClass(name, ba, 0, ba.length);
}
}
{code}
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