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Sec Bug #81722 Session Fixation in PHP Core PHPSESSID
Submitted: 2022-06-14 19:17 UTC Modified: 2022-06-20 12:47 UTC
From: aslantugay at hotmail dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 7.4.30 OS: Ubuntu
Private report: No CVE-ID: None
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 [2022-06-14 19:17 UTC] aslantugay at hotmail dot com 
Description:
------------
with this vulnerability you can change target session id via changing in browser or MITM attack. When you send custom PHPSESSID php accept that and you have two session ID for same account. This vulnerability classifed as session fixation.

Test script:
---------------
https://github.com/tugayaslan/Vulnerabilities/blob/main/PHP-Core-Session-Fixation.md

Expected result:
----------------
Some platforms make it easy to protect against Session Fixation, while others make it a lot more difficult. In most cases, simply discarding any existing session is sufficient to force the framework to issue a new sessionid cookie, with a new value.

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 [2022-06-15 06:38 UTC] stas@php.net
-Status: Open +Status: Not a bug
 [2022-06-15 06:38 UTC] stas@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Use session.use_strict_mode

See https://www.php.net/manual/en/session.configuration.php#ini.session.use-strict-mode
 
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