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vBulletin 5.x / 4.x Persistent Cross Site Scripting

vBulletin 5.x / 4.x Persistent Cross Site Scripting
Posted Oct 12, 2014
Authored by oststrom

vBulletin versions 5.x and 4.x suffer from a persistent cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2014-2021
SHA-256 | 5d7e0332012b5ff0ccca849a35d2ba9c2d680f444985d0f62bc7fcbac0ad9c1d

vBulletin 5.x / 4.x Persistent Cross Site Scripting

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Hash: SHA1



CVE-2014-2021 - vBulletin 5.x/4.x - persistent XSS in AdminCP/ApiLog via
xmlrpc API (post-auth)

============================================================================
====================



Overview

- --------



date : 10/12/2014

cvss : 4.6 (AV:N/AC:H/Au:S/C:P/I:P/A:P) base

cwe : 79



vendor : vBulletin Solutions

product : vBulletin 4

versions affected : latest 4.x and 5.x (to date); verified <= 4.2.2 ;
<= 5.0.x

* vBulletin 5.0.5 (verified)

* vBulletin 4.2.2 (verified)

* vBulletin 4.2.1 (verified)

* vBulletin 4.2.0 PL2 (verified)



exploitability :

* remotely exploitable

* requires authentication (apikey)

* requires non-default features to be enabled (API interface,
API-Logging)

* requires user interaction to trigger exploit (admincp - admin
views logs)



patch availability (to date) : None





Abstract

- ---------

vBulletin 4/5 does not properly sanitize client provided xmlrpc
attributes (e.g. client name)

allowing the remote xmlrpc client to inject code into the xmlrpc API
logging page.

Code is executed once an admin visits the API log page and clicks on the
API clients name.



risk: rather low - due to the fact that you the api key is required

you can probably use CVE-2014-2023 to obtain the api key





Details

- --------



vulnerable component:

./admincp/apilog.php?do=viewclient

apilog.php does not sanitize xmlrpc client provided data before passing
it to

print_label_row to generate the output page.





Proof of Concept (PoC)

- ----------------------



see https://github.com/tintinweb/pub/tree/master/pocs/cve-2014-2021





1) prerequesites

1.1) enable API, generate API-key

logon to AdminCP

goto "vBulletin API"->"API-Key" and enable the API interface,
generate key

goto "vBulletin API"->"API-Log" and enable all API logging

2) run PoC

edit PoC to match your TARGET, APIKEY (, optionally DEBUGLEVEL)

run PoC, wait for SUCCESS! message

3) trigger exploit

logon to AdminCP

goto "vBulletin API"->"API-Log" and hit "view"

in search results click on "client name"

the injected msgbox pops up





Timeline

- --------



2014-01-14: initial vendor contact - no reply

2014-01-24: vendor contact - no reply

2014-10-13: public disclosure



Contact

- --------



tintinweb - https://github.com/tintinweb/pub/cve-2013-2021





(0x721427D8)

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