Ektron CMS 8.5.0 File Upload / XXE Injection

Type packetstorm
Reporter Phil Taylor
Modified 2012-09-06T00:00:00


                                            `Sense of Security - Security Advisory - SOS-12-009  
Release Date. 05-Sep-2012  
Last Update. -   
Vendor Notification Date. 07-May-2012  
Product. Ektron CMS  
Platform. ASP.NET  
Affected versions. Ektron CMS version 8.5.0 and possibly others  
Severity Rating. High  
Impact. Exposure of sensitive information  
Exposure of system information  
System Access  
Attack Vector. Remote without authentication  
Solution Status. Fixed in version 8.6   
(not verified by SOS)  
CVE reference. CVE - not yet assigned  
The web application is vulnerable to multiple security  
vulnerabilities, such as Unauthenticated File Upload and  
XML eXternal Entities (XXE) injection.  
1.Unauthenticated File Upload:  
The form /WorkArea/Upload.aspx does not require authentication  
to upload a file. By issuing a POST request with a webshell  
embedded in a JPEG image and specifying the ASPX extension it is  
possible to upload ASPX code to /uploadedimages/. The ASPX code  
is placed in the comment section of the JPEG so that it survives  
image resizing.  
2.XXE Injection:  
The XML parser at /WorkArea/Blogs/xmlrpc.aspx is vulnerable to  
XML external entity attacks which can be used to Scan behind  
perimeter firewalls or possibly include files from the local file  
system e.g.  
<!DOCTYPE scan [<!ENTITY test SYSTEM "http://localhost:22">]>  
Upgrade to version 8.6 and remove the /WorkArea/Blogs/xmlrpc.aspx file.  
Discovered by.  
Phil Taylor and Nadeem Salim from Sense of Security Labs.  
About us.  
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