My websites keeps crashing periodically (I get a blank page) and the error log reports a problem with joomsef.php script.
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[Thu Aug 13 20:36:47 2009] [error] [client 83.26.65.114] ALERT - canary mismatch on efree() - heap overflow detected (attacker '83.26.65.114', file '.../public_html/components/com_sef/joomsef.php', line 346)
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I have to restart server to make site work again.
I have JoomSEF 3.3.0 and extension fo virtuemart.
Could you please shed some light on the issue?