bugtraq - CVE-2017-17762 - XXE Vulnerability in Episerver

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Message-ID: <CA+-4HnVyRsqFic_QMTnA_WWBLAdLu7-G1X0MCzm7-UPT3bUbqw@mail.gmail.com>
Date: Thu, 6 Sep 2018 14:21:27 +0200
From: Jonas Lejon <jonas.bugtraq@...op.se>
To: bugtraq@...urityfocus.com
Subject: CVE-2017-17762 - XXE Vulnerability in Episerver

About
==============
Blind (XXE) XML External Entity vulnerability in the CMS Episerver 7
patch 4 and below. The vulnerability is in the blog module and can be
used even if the blog module has been disabled.

Exploit
==============
PoC exploit attached.

Mitigations
==============
Disable access to the path /util/xmlrpc/Handler.ashx
Disable outgoing access from the webserver, including DNS etc.

Disclosure timeline
==============
2017-12-12 Contacting CERT-SE
2017-12-13 Contacting the Episerver company
2017-12-19 CVE-number reserved
2017-12-21 The Episerver VP R&D acknowledges the vulnerability.
Internal bug number is #128556 and he writes that it's fixed from
Episerver 7-patch 5
2018-08-28 First public info

Regards,
Jonas Lejon
Triop AB

View attachment "episploit.py" of type "text/x-python-script" (3070 bytes)