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AUSCERT Security Bulletin
ASB-2016.0086.2
Multiple vulnerabilities have been identified in Plone and Zope
13 October 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Plone
Zope2
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Provide Misleading Information -- Remote/Unauthenticated
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-7140 CVE-2016-7139 CVE-2016-7138
CVE-2016-7136
Revision History: October 13 2016: Added CVE numbers
September 6 2016: Initial Release
OVERVIEW
A number of vulnerabilities have been identified in Plone and Zope2
prior to Hotfix 20160830. [1]
IMPACT
The vendor has provided the following information:
"In multiple places, Zope2's ZMI pages do not properly escape user
input." [2]
"In multiple places, Zope2's ZMI pages do not properly escape user
input." [3]
"Plone's URL checking infrastructure includes a method for checking
if URLs valid and located in the Plone site. By passing javascript
into this specially crafted url, XSS can be achieved." [4]
"In multiple places, Plone blindly uses the referer header to
redirect a user to the next page after a particular action. An
attacker could utilize this to draw a user into a redirection
attack." [5]
"z3c.form will currently accept data from GET requests when the form
is supposed to be POST. This allows a user to inject a potential XSS
attack into a form. With certain widgets in Plone admin forms, the
input is expected to be safe and can cause a reflexive XSS attack.
Additionally, there is potential for an attack that will trick a
user into saving a persistent XSS." [6]
"By using relative paths and guessing locations on a server Plone is
installed on, an attacker can read data from a target server that
the process running plone has permission to read. The attacker needs
administrator privileges on the Plone site to perform this attack."
[7]
MITIGATION
The vendor recommends applying Hotfix 20160830 to correct these
issues. [1]
REFERENCES
[1] Security patch released: 20160830
https://plone.org/security/announcements/security-patch-released-20160830
[2] Non-Persistent XSS in Zope2
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-zope2
[3] Non-Persistent XSS in Plone
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone
[4] Non-Persistent XSS in Plone
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-1
[5] Open Redirection in Plone
https://plone.org/security/hotfix/20160830/open-redirection-in-plone
[6] Non-Persistent XSS in Plone forms
https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-forms
[7] Filesystem information leak
https://plone.org/security/hotfix/20160830/filesystem-information-leak
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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