Arbitrary Directory Deletion in WP-Fastest-Cache

| March 18, 2019

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The WP-Fastest-Cache plugin authors released a new update, version 0.8.9.1, fixing a vulnerability (CVE-2019-6726) present during its install alongside the WP-PostRatings plugin. According to seclists.org: A successful attack allows an unauthenticated attacker to specify a path to a directory from which files and directories will be deleted recursively. The vulnerable code path extracts the path portion of the referrer header and then uses string concatenation to build an absolute path. This path is then passed to the ‘rm_folder_recursively’ function which deletes folders and their files in a recursive manner. Deleting Arbitrary Directories in WordPress. When the correct conditions are met, this vulnerability allows visitors to delete entire directories on affected websites. The method is hooked to the rate_post action, which is executed by the WP-PostRatings plugin. Note that WP-PostRatings isn’t vulnerable all by itself. Its presence is just a condition for the exploit to work. If the plugin is not installed, the vulnerability cannot be exploited. This bug is only exploitable if both plugins are installed and active on the same site.

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