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Relevanssi Premium 1.14.4 Code Execution

Relevanssi Premium 1.14.4 Code Execution
Posted Nov 19, 2016
Authored by Glyn Wintle

An unserialization vulnerability in Relevanssi Premium version 1.14.4 could allow for code execution.

tags | advisory, code execution
MD5 | eef079934843a22b719f148f753bac94

Relevanssi Premium 1.14.4 Code Execution

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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 PHPA 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
================
AchievingA arbitrary code executionA depends onA which classes are available (i.e. which plugins and themes are installed and active). It wonat be possible in all situations.

Mitigations
================
Upgrade to versionA 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@dxw.com to acknowledge this report if you received it via a third party (for example, plugins@wordpress.org) 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:A Vendor reported fixed
2016-11-17: Requested CVE
2016-11-17:A Advisory published



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




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