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<html> | ||
<!-- | ||
Copyright (C) 2022 XStream committers. | ||
All rights reserved. | ||
The software in this package is published under the terms of the BSD | ||
style license a copy of which has been included with this distribution in | ||
the LICENSE.txt file. | ||
Created on 26. November 2022 by Joerg Schaible | ||
--> | ||
<head> | ||
<title>CVE-2022-40151</title> | ||
</head> | ||
<body> | ||
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<h2 id="vulnerability">Vulnerability</h2> | ||
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<p>CVE-2022-40151: XStream is vulnerable to a Denial of Service attack due to stack overflow.</p> | ||
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<h2 id="affected_versions">Affected Versions</h2> | ||
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<p>All versions until and including version 1.4.19 are affected, if using the version out of the box.</p> | ||
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<h2 id="description">Description</h2> | ||
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<p>The processed stream at unmarshalling time contains type information to recreate the formerly written objects. | ||
XStream creates therefore new instances based on these type information. An attacker can manipulate the processed | ||
input stream and replace or inject objects, that result in a stack overflow due to deeply nested objects causing a | ||
denial of service.</p> | ||
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<h2 id="reproduction">Steps to Reproduce</h2> | ||
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<p>Create a simple HashSet and use XStream to marshal it to XML. Replace the XML with generated with the | ||
following code snippet and unmarshal it with XStream:</p> | ||
<div class="Source Java"><pre>String xml = new String(); | ||
int i = 0; | ||
for( ; i < 10000; ++i) { | ||
xml += "<set>"; | ||
} | ||
for( ; i > 0; --i) { | ||
xml += "</set>"; | ||
} | ||
</pre></div> | ||
<div class="Source Java"><pre>XStream xstream = new XStream(); | ||
xstream.fromXML(xml); | ||
</pre></div> | ||
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<p>As soon as the XML gets unmarshalled, the recursion is too deep and the executing thread is aborted with a stack | ||
overflow error.</p> | ||
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<h2 id="impact">Impact</h2> | ||
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<p>The vulnerability may allow a remote attacker to terminate the application with a stack overflow error resulting | ||
in a denial of service only by manipulating the processed input stream.</p> | ||
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<h2 id="workarounds">Workarounds</h2> | ||
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<p>The only solution is to catch the StackOverflowError in the client code calling XStream.</p> | ||
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<h2 id="credits">Credits</h2> | ||
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<p>Henry Lin of the Google OSS-Fuzz team found and reported the issue to XStream and provided the required | ||
information to reproduce it.</p> | ||
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</body> | ||
</html> |
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