[FD] Unserialization vulnerability in Relevanssi Premium could allow admins to execute arbitrary code (in some circumstances) (WordPress plugin)

[dxw Security <security@xxxxxxx>]

Details
================
Software: Relevanssi Premium
Version: v1.14.4
Homepage: https://www.relevanssi.com/
Advisory report: 
https://security.dxw.com/advisories/unserialization-vulnerability-in-relevanssi-premium-could-allow-admins-to-execute-arbitrary-code-in-some-circumstances/
CVE: Awaiting assignment
CVSS: 9 (High; AV:N/AC:L/Au:S/C:C/I:C/A:C)

Description
================
Unserialization vulnerability in Relevanssi Premium could allow admins to 
execute arbitrary code (in some circumstances)

Vulnerability
================



If logged in as an admin on any site you can go to settings, Relevanssi 
Premium, import or export options. This is a text field that accepts a 
serialised PHP object. It is possible to submit a string that contains an evil 
encoded object that executes arbitrary code (if there are classes available 
with particular methods such as __destruct).




Proof of concept
================
Achieving arbitrary code execution depends on which classes are available (i.e. 
which plugins and themes are installed and active). It won’t be possible in all 
situations.

Mitigations
================
Upgrade to version 1.14.6.1 or later.

Disclosure policy
================
dxw believes in responsible disclosure. Your attention is drawn to our 
disclosure policy: https://security.dxw.com/disclosure/

Please contact us on security@xxxxxxx to acknowledge this report if you 
received it via a third party (for example, plugins@xxxxxxxxxxxxx) as they 
generally cannot communicate with us on your behalf.

This vulnerability will be published if we do not receive a response to this 
report with 14 days.

Timeline
================

2016-10-07: Discovered
2016-11-01: Reported
2016-11-02: Vendor reported fixed
2016-11-17: Requested CVE
2016-11-17: Advisory published



Discovered by dxw:
================
Glyn Wintle
Please visit security.dxw.com for more information.
          


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