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[SECURITY] Arbitrary File Upload vulnerability #561

@GatekeeperBuster

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@GatekeeperBuster

Recently, our team found a Arbitrary File Upload vulnerability,The vulnerability logic is present in the file:
https://github.com/getk2/k2/blob/master/media/k2/assets/vendors/verot/class.upload.php/src/class.upload.php#L3104
image
The suffix blacklist detection utilizes a regular expression with $/i. Attackers can bypass this blacklist detection by using 1.php[space], 1.php. or Windows-specific characters like 1.php::$DATA.We have submitted the issue to the component developer:verot/class.upload.php#187

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