full-disclosure - [FD] Authorization bypass in PHPLiteAdmin since 1.9.5

Open Source and information security mailing list archives

Date: Mon, 23 Apr 2018 06:41:09 +0200
From: Karsten König <mail@...enig.net>
To: oss-security@...ts.openwall.com, fulldisclosure@...lists.org
Subject: [FD] Authorization bypass in PHPLiteAdmin since 1.9.5

Hello,

I found a small issue in PHPLiteAdmin. It's an authorization bypass
which works since version 1.9.5 from 2014 (current is 1.9.7.1) because
PLA uses '==' instead of '===' for the password comparison in
'attemptGrant' of the 'Authorization' class. If the password is set to
one which correspondends to a number in scientific notation, one could
easier bruteforce the password or bypass it completely, e.g.:

php > var_dump('200' == '2e2');
bool(true)
php > var_dump('0' == '0e2');
bool(true)
php > var_dump('0' == '0e2342');
bool(true)

I opened an issue at GitHub for this[0] and have written about it[1]
(section 2 is the interesting one for this issue).

Best,

Karsten

[0] https://github.com/phpLiteAdmin/pla/issues/11
[1]
http://k3research.outerhaven.de/posts/small-mistakes-lead-to-big-problems.html

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