CVE-2018-1000888

PEAR Archive_Tar version 1.4.3 and earlier contains a CWE-502, CWE-915
vulnerability in the Archive_Tar class. There are several file operations
with $v_header['filename'] as parameter (such as file_exists, is_file,
is_dir, etc). When extract is called without a specific prefix path, we can
trigger unserialization by crafting a tar file with
phar://[path_to_malicious_phar_file] as path. Object injection can be
used to trigger destruct in the loaded PHP classes, e.g. the Archive_Tar
class itself. With Archive_Tar object injection, arbitrary file deletion
can occur because @unlink($this->_temp_tarname) is called. If another
class with useful gadget is loaded, it may possible to cause remote code
execution that can result in files being deleted or possibly modified. This
vulnerability appears to have been fixed in 1.4.4.

Bugs

• <https://pear.php.net/bugs/bug.php?id=23782&gt;

Notes