Full Disclosure: CVE-2017-17762 – XXE Vulnerability in Episerver CMS


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CVE-2017-17762 – XXE Vulnerability in Episerver CMS


From: Jonas Lejon
Date: Wed, 12 Sep 2018 10:37:19 +0200


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
https://triop.se

Attachment:
episploit.py

Description:

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