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Bug #17162 unlink() bypasses safe_mode
Submitted: 2002-05-12 10:38 UTC Modified: 2002-05-12 11:46 UTC
From: ilia at prohost dot org Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 4.2.0 OS: Linux 2.4.18
Private report: No CVE-ID: None
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From: ilia at prohost dot org
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 [2002-05-12 10:38 UTC] ilia at prohost dot org 
unlink() function can be used to delete files that user does not have permissions to delete.

Ex.

touch test;
ls -l test;
-rw-r--r--   1 forum    forum           0 May 12 10:33 test

ls -l a.php
-rw-rw-rw-   1 www      www            35 May 12 10:33 a.php
a.php:
<?php unlink('test'); ?>

after a.php is run via the web the file test is GONE!

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 [2002-05-12 10:40 UTC] ilia at prohost dot org 
I forgot to add, the webserver runs as user/group "www".
 [2002-05-12 10:41 UTC] derick@php.net 
This has nothing to do with file permissions, update summary

Derick
 [2002-05-12 11:46 UTC] rasmus@php.net 
Also not a bug, you can unlink files in directories you own.  In this case "directories you own" means a directory owned by the user id that owns the current script.
 
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