** Description changed:
[impact]
XStream through 1.4.9, when a certain denyTypes workaround is not used,
mishandles attempts to create an instance of the primitive type 'void'
during unmarshalling, leading to a remote application crash, as
demonstrated by an xstream.fromXML("<void/>") call.
[test case]
- self-test for failure is provided as part of the upstream commit
+ install java jdk (e.g. openjdk-8-jdk) and libxstream-java on a xenial
+ (or trusty) system. Then create a file named TestCVE.java with this
+ content:
+
+
+ import com.thoughtworks.xstream.XStream;
+
+ public class TestCVE {
+
+ public static void main(String[] args) {
+ XStream xstream = new XStream();
+ xstream.fromXML("<void/>");
+ }
+
+ }
+
+
+ then run this (from the same directory as the file) to compile it:
+
+ $ javac -cp /usr/share/java/xstream-1.4.8.jar:. TestCVE.java
+
+ then test it:
+
+ $ java -cp /usr/share/java/xstream-1.4.8.jar:. TestCVE
+
+ failure is a JVM segfault, e.g.:
+
+ #
+ # A fatal error has been detected by the Java Runtime Environment:
+ #
+ # SIGSEGV (0xb) at pc=0x00007f6546a6f9d2, pid=9279, tid=0x00007f654816c700
+
+ success is a normal java exception with backtrace, e.g.:
+
+ Exception in thread "main"
+ com.thoughtworks.xstream.converters.ConversionException: Type void
+ cannot have an instance
[regression potential]
- regressions could include failing to parse the stream.
+ regressions could include failing to parse the stream, or otherwise
+ cause exceptions or segfaults.
[other info]
http://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-7957.html
https://x-stream.github.io/CVE-2017-7957.html
https://github.com/x-stream/xstream/commit/b3570be
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https://bugs.launchpad.net/bugs/1780844
Title:
CVE-2017-7957: XStream through 1.4.9 mishandles attempts to create an
instance of the primitive type 'void'
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