#40806 [NEW]: session id gets over-written by other server's cookie

From: Date: Wed, 14 Mar 2007 19:11:51 +0000
Subject: #40806 [NEW]: session id gets over-written by other server's cookie
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-110349@lists.php.net to get a copy of this message 
From:             john at albin dot net
Operating system: 
PHP version:      5.2.1
PHP Bug Type:     Session related
Bug description:  session id gets over-written by other server's cookie

Description:
------------
Here's a not-so-unusual situation:

If a user goes to a PHP-based website with enabled sessions at http://
example.com, by default PHP sets a cookie named PHPSESSID 
for .example.com.

If that user then goes to a seperate website at http://
other.example.com, PHP sets a cookie named PHPSESSID 
for .other.example.com.

From the cookie spec:
   When sending cookies to a server, all cookies with a more specific 
path mapping should be sent before cookies with less specific path 
mappings. For example, a cookie "name1=foo" with a path mapping of "/" 
should be sent after a cookie "name1=foo2" with a path mapping of "/
bar" if they are both to be sent.

Even though both cookies are submitted by the browser back to the 
other.example.com website, PHP clobbers the value of the more-specific 
cookie with the less-specific cookie that follows. So there's no way 
that the PHP code could ever get the correct session id.



Reproduce code:
---------------
Go to http://example.com and let PHP set a default session cookie.

Go to http://other.example.com and let PHP set a default
session cookie.

On the other.example.com website run: <?php session_start(); $value =
$_COOKIE['PHPSESSID'] ?>

Expected result:
----------------
To get the session_id from the .other.example.com cookie.

Actual result:
--------------
You get the session_id from the .example.com cookie.

-- 
Edit bug report at http://bugs.php.net/?id=40806&edit=1
-- 
Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=40806&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=40806&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=40806&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=40806&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=40806&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=40806&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=40806&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=40806&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=40806&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=40806&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=40806&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=40806&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=40806&r=globals
PHP 3 support discontinued:   http://bugs.php.net/fix.php?id=40806&r=php3
Daylight Savings:             http://bugs.php.net/fix.php?id=40806&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=40806&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=40806&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=40806&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=40806&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=40806&r=mysqlcfg

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