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K2 Smartforms 4.6.11 Server-Side Request Forgery

K2 Smartforms 4.6.11 Server-Side Request Forgery
Posted May 22, 2018
Authored by Foo Jong Meng

K2 Smartforms version 4.6.11 suffers from a server-side request forgery vulnerability.

tags | exploit
advisories | CVE-2018-9920
SHA-256 | bfed1b3b47a40579a99e3b278436f4f9ebafa9072390b9d0c7be68ca11156e09

K2 Smartforms 4.6.11 Server-Side Request Forgery

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# Vulnerability type: Server Side Request Forgery
# Vendor: https://www.k2.com/
# Product: K2 Smartforms
# Affected version: 4.6.11
# Credit: Foo Jong Meng
# CVE ID: CVE-2018-9920

# DESCRIPTION:

Server side request forgery exists in the runtime application in K2 smartforms 4.6.11 via a modified hostname in an https://*/Identity/STS/Forms/Scripts URL.

By replacing the "GET" parameter to any external domain (i.e. https://www.external-domain.com) while accessing the affected application (e.g.
https://url/Identity/STS/Forms/Scripts).

The resulting page shows URL with https://url/Identity/STS/Forms/Scripts but rendering https://www.external-domain.com in the body (aka local web defacement).

A port scan on the internal servers can be performed by changing the "GET" parameter URL and analysing the results of the return page.


# PROOF OF CONCEPT:
1. Use a web proxy (i.e zapproxy, burp) to intercept "GET" request for:
https://url/Identity/STS/Forms/Scripts

2. Replace the "GET" parameter to any external domain (i.e. https://www.external-domain.com/)

3. The resulting page is one with https://url/Identity/STS/Forms/Scripts but showing https://www.external-domain.com/ in the body.
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