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AUSCERT External Security Bulletin Redistribution
ESB-2019.3134
Apache Commons Beanutils addresses off-by-default security fix
16 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache Commons Beanutils
Publisher: Apache
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-10086 CVE-2014-0114
Reference: ASB-2014.0077
ESB-2014.0684
Original Bulletin:
https://www.mail-archive.com/announce@apache.org/msg05413.html
https://issues.apache.org/jira/browse/BEANUTILS-520
Comment: To be clear, the fix for CVE-2014-0114 was not enabled by default,
so CVE-2019-10086 was defined to classify this. With version 1.9.4
the fix is enabled by default.
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CVE-2019-10086. Apache Commons Beanutils does not suppresses the class
property in PropertyUtilsBean by default.
Severity: Medium
Vendor: The Apache Software Foundation
Versions Affected: commons-beanutils-1.9.3 and earlier
Description: A special BeanIntrospector class was added in version
1.9.2.
This can be used to stop attackers from using the class property of
Java objects to get access to the classloader.
However this protection was not enabled by default.
PropertyUtilsBean (and consequently BeanUtilsBean) now disallows class
level property access by default, thus protecting against
CVE-2014-0114.
Mitigation: 1.X users should migrate to 1.9.4.
Credit: This was discovered by Melloware (https://melloware.com/).
Example:
/**
* Example displaying the new default behaviour such that
* it is not possible to access class level properties utilizing the
* BeanUtilsBean, which in turn utilizes the PropertyUtilsBean.
*/
public void testSuppressClassPropertyByDefault() throws Exception {
final BeanUtilsBean bubD = new BeanUtilsBean();
final AlphaBean bean = new AlphaBean();
try {
bub.getProperty(bean, "class");
fail("Could access class property!");
} catch (final NoSuchMethodException ex) {
// ok
}
}
/**
* Example showing how by which one would use to revert to the
* behaviour prior to the 1.9.4 release where class level properties
were accessible by
* the BeanUtilsBean and the PropertyUtilsBean.
*/
public void testAllowAccessToClassProperty() throws Exception {
final BeanUtilsBean bubD new BeanUtilsBean();
bub.getPropertyUtils().removeBeanIntrospector(SuppressPropertiesBeanIntros=
pector.SUPPRESS_CLASS);
final AlphaBean bean = new AlphaBean();
String result = bub.getProperty(bean, "class");
assertEquals("Class property should have been accessed", "class
org.apache.commons.beanutils2.AlphaBean", result);
}
References.
[1] https://issues.apache.org/jira/browse/BEANUTILS-520
[2] http://commons.apache.org/proper/commons-beanutils/
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