[FD] SQL injection and 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/sql-injection-and-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
================
SQL injection and unserialization vulnerability in Relevanssi Premium could 
allow admins to execute arbitrary code (in some circumstances)

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



Relevanssi has a search function on the admin side that is not visible in the 
user interface, however the code is there and can be called. This functionality 
contains an sql injection, and this sql injection can be exploited to pass user 
controlled values into an unserialization call and run arbitrary code (if there 
are classes available with particular methods such as __destruct).



If a logged in admin user is tricked into going to an attacker controlled 
website, JavaScript could be written to make the admins browser submit the 
above request, without their knowledge (see 2.3 Social engineering, p.18). 
Alternatively this attack can be exploited by an attacker with Admin privileges.







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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