CVE-2022-42889 PoC — Apache Commons Text prior to 1.10.0 allows RCE when applied to untrusted input due to insecure interpolation defaults

Source

https://github.com/0xst4n/CVE-2022-42889

Associated Vulnerability

Title: Apache Commons Text prior to 1.10.0 allows RCE when applied to untrusted input due to insecure interpolation defaults (CVE-2022-42889)
Description:Apache Commons Text performs variable interpolation, allowing properties to be dynamically evaluated and expanded. The standard format for interpolation is "${prefix:name}", where "prefix" is used to locate an instance of org.apache.commons.text.lookup.StringLookup that performs the interpolation. Starting with version 1.5 and continuing through 1.9, the set of default Lookup instances included interpolators that could result in arbitrary code execution or contact with remote servers. These lookups are: - "script" - execute expressions using the JVM script execution engine (javax.script) - "dns" - resolve dns records - "url" - load values from urls, including from remote servers Applications using the interpolation defaults in the affected versions may be vulnerable to remote code execution or unintentional contact with remote servers if untrusted configuration values are used. Users are recommended to upgrade to Apache Commons Text 1.10.0, which disables the problematic interpolators by default.

Description

CVE-2022-42889 dockerized sample application (Apache Commons Text RCE)

Readme

# CVE-2022-42889 Test application

This repository contains a simple application using Apache Commons Text 1.9 which is vulnerable to CVE-2022-42889.

## Running the application

Build and run the application via docker:

```bash
docker build . -t vulnerable-app
docker run vulnerable-app
```

```sh
$ docker ps                                 
CONTAINER ID   IMAGE            COMMAND                  CREATED         STATUS         PORTS                                       NAMES
d01d5cf33f60   vulnerable-app   "java -jar demo-0.0.…"   11 seconds ago   Up 11 seconds                                                awesome_brown
```

```sh
$ docker container exec -it d01d5cf33f60 ash
/opt/app # ls /tmp
hsperfdata_root  rce_test
```

As you can see, the file `rce_test` exists. Which indicates RCE was succesful.

File Snapshot

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