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Interspire Email Marketer Authentication Bypass

Interspire Email Marketer Authentication Bypass
Posted Oct 17, 2017
Authored by Hakan Kusne

Interspire Email Marketer versions prior to 6.1.6 suffered from an administrative authentication bypass vulnerability.

tags | advisory, bypass
advisories | CVE-2017-14322
MD5 | d16b312e6faf1afda94639ee5d1222ef

Interspire Email Marketer Authentication Bypass

Change Mirror Download
Title:
======
Interspire Email Marketer - Remote Admin Authentication Bypass

Author:
=======
Hakan KA1/4sne, Infoteam Security (CH)

CVE-ID:
=======
CVE-2017-14322

Risk Information:
=================
CVSS Base Score: 9.8
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O

Timeline:
=========
2017-09-12 Vulnerability discovered
2017-09-12 Discovered vendor already fixed it but never communicated to clients, leaving hundreds vulnerable in the wild
2017-10-17 Public disclosure

Affected Products:
==================
Interspire Email Marketer prior to version 6.1.6

Vendor Homepage:
================
http://www.interspire.com/emailmarketer/

Details:
========
The function in charge of checking whether the user is already logged in
init.php in Interspire Email Marketer (IEM) prior to 6.1.6 allows
remote attackers to bypass authentication and obtain administrative
access by using the IEM_CookieLogin cookie with a specially crafted
value.
On top of that, if the customer doesn't have an annuel maintenance plan,
the application says that it's on the last available version and there is no update.

The vulnerabilities were found during an incident response on a compromise
instance of the application.

Proof of Concept:
=================
Details provided here :
https://security.infoteam.ch/en/blog/posts/narrative-of-an-incident-response-from-compromise-to-the-publication-of-the-weakness.html

Fix:
====
Vendor has patched the vulnerability in version 6.1.6, but never communicated to it's customers about it specifically.

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