cve/2006/CVE-2006-5178.md

CVE-2006-5178

Description

Race condition in the symlink function in PHP 5.1.6 and earlier allows local users to bypass the open_basedir restriction by using a combination of symlink, mkdir, and unlink functions to change the file path after the open_basedir check and before the file is opened by the underlying system, as demonstrated by symlinking a symlink into a subdirectory, to point to a parent directory via .. (dot dot) sequences, and then unlinking the resulting symlink.

POC

Reference

• http://securityreason.com/securityalert/1692

Github

• https://github.com/Whissi/realpath_turbo