Bug #73708 [Opn]: php .user.ini conf file design issue resulting in bypass

Edit report at https://bugs.php.net/bug.php?id=73708&edit=1 ID: 73708 User updated by: tr3jer at gmail dot com Reported by: tr3jer at gmail dot com Summary: php .user.ini conf file design issue resulting in bypass Status: Open Type: Bug Package: *Configuration Issues Operating System: all PHP Version: Irrelevant Block user comment: N Private report: N New Comment: but this is .user.ini fault, .user.ini set open_basedir=/home/wwwroot/default, just It should not cross the directory！ Previous Comments: ------------------------------------------------------------------------ [2016-12-10 12:26:05] requinix@php.net Yes, a setting in default/bypass/.user.ini will override a setting in default/.user.ini. That is how it is supposed to work. If an attacker is able to create files on the server then PHP cannot stop them. If open_basedir is a problem then it should be set at the server level (eg, php.ini). ------------------------------------------------------------------------ [2016-12-10 12:01:31] tr3jer at gmail dot com os is all ------------------------------------------------------------------------ [2016-12-10 11:50:29] tr3jer at gmail dot com Description: ------------ hello! php security team.I find one .user.ini vulnerabilityinfluences all have .user.ini php versionstest verision = php5.4.user.ini Can be configured open_basedir，so...here i use open_basedir as exampleimage1:http://7xiw31.com1.z0.glb.clouddn.com/QQ20161210-1@2x.pngSo that attackers can not cross this directory and read system fileimage2:http://7xiw31.com1.z0.glb.clouddn.com/QQ20161210-0@2x.pngI think .user.ini just The current directory takes effect，so...again write one .user.ini And the original Do not conflict？ Test script: --------------- We just have upload file Permissions：image3:http://7xiw31.com1.z0.glb.clouddn.com/QQ20161210-4@2x.pngcreate new directory and write new .user.ini：open_basedir=/image4:http://7xiw31.com1.z0.glb.clouddn.com/QQ20161210-1@2x.pngyep！don't need restart，just wait a few minutes，can bypass .user.ini limit：image5:http://7xiw31.com1.z0.glb.clouddn.com/QQ20161210-3@2x.png ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73708&edit=1