[MajorSecurity Advisory #46]Plogger - Session fixation Issue
[MajorSecurity Advisory #46]Plogger - Session fixation Issue
Details
=======
Product: Plogger
Remote-Exploit: yes
Vendor-URL: http://www.plogger.org
Vendor-Status: informed
Advisory-Status: published
Credits
============
Discovered by: David Vieira-Kurz
http://www.majorsecurity.de
Original Advisory:
============
http://www.majorsecurity.de/index_2.php?major_rls=major_rls46
Introduction
============
"Plogger is the next generation in open-source photo gallery systems." -from
plogger.org
More Details
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1. Session fixation:
The "PHPSESSID" parameter can be set to a malicious and arbitrary value.
1.1 Description:
In a session fixation attack, the attacker fixes the user's session ID before
the user even logs into the target server.
After a user's session ID has been fixed, the attacker will wait for them to
login.
Once the user does so, the attacker uses the predefined session ID value to
assume their online identity.
Workaround:
============
1. Do not accept session identifiers from GET / POST variables.
2.Regenerate SID on each request.
3. Accept only server generated SID:
One way to improve security is to not accept session identifiers not generated
by server.
if ( ! isset( $_SESSION['SERVER_GENERATED_SID'] ) ) {
session_destroy(); // destroy all data in session
}
session_regenerate_id(); // generate a new session identifier
$_SESSION['SERVER_GENERATED_SID'] = true;
History/Timeline
================
22.04.2007 discovery of the vulnerability
23.04.2007 contacted the vendor
23.04.2007 working patch sent to the vendor
24.04.2007 advisory is written
24.04.2007 advisory released
MajorSecurity
=======
MajorSecurity is a non-profit German penetration testing and security research
project
which consists of only one person at the present time.
http://www.majorsecurity.de/