Wildfly - WEB-INF and META-INF Information Disclosure via Filter Restriction Bypass

Exploit Title: Wildfly: WEB-INF and META-INF Information Disclosure via Filter Restriction Bypass

Date: 09.02.16

Exploit Author: Tal Solomon of Palantir Security

Vendor Homepage: https://bugzilla.redhat.com/show_bug.cgi?id=1305937

Software Link: http://wildfly.org/downloads/

Version: This issue effects versions of Wildfly prior to 10.0.0.Final, including 9.0.2.Final, and 8.2.1.Final. 

Tested on: Windows

CVE : CVE-2016-0793



An information disclosure of the content of restricted files WEB-INF and META-INF via filter mechanism was reported. Servlet filter restriction mechanism is enforced by two code checks: 



if (path.startsWith("/META-INF") || path.startsWith("META-INF") || path.startsWith("/WEB-INF") || path.startsWith("WEB-INF")) {

    return false;

}



private boolean isForbiddenPath(String path) {

                return path.equalsIgnoreCase("/meta-inf/") || path.regionMatches(true, 0, "/web-inf/", 0, "/web-inf/".length());

}



which can be bypassed using lower case and adding meaningless character to path.



Proof of Concept Video:

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39573.zip