Phar


"In PHP, PHAR (PHP Archive) files can be used to package PHP applications and PHP libraries into one archive file. The PHAR format in PHP uses a single file format which can be used to store and execute multiple PHP code. PHAR files contain metadata about the files in the archive. In a PHAR file, this metadata is stored in a serialized format. If a file operation is performed on a PHAR file via the phar:// wrapper, the PHAR file’s metadata would be unserialized. As such, an attacker could perform PHP object injection without the use of the unserialize function by uploading a PHAR file. "

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