What potential security risks should be considered when using shell_exec to unzip files in PHP?

When using shell_exec to unzip files in PHP, one potential security risk to consider is the possibility of command injection attacks. If user input is not properly sanitized, an attacker could inject malicious commands into the shell_exec function, leading to unauthorized access or execution of harmful operations on the server. To mitigate this risk, it is important to validate and sanitize user input before passing it to shell_exec. 

// Example of how to securely unzip files using PHP's ZipArchive class instead of shell_exec

$zipFile = 'example.zip';
$extractPath = 'extracted/';

$zip = new ZipArchive;
if ($zip->open($zipFile) === TRUE) {
    $zip->extractTo($extractPath);
    $zip->close();
    echo 'Files unzipped successfully';
} else {
    echo 'Failed to unzip files';
}

Keywords

shell_exec unzip files security risks PHP file extraction

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