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Date: Mon, 04 May 2015 10:21:09 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: PHP and some == wonkiness
https://news.ycombinator.com/item?id=9484757 read the entire thread for
an ongoing series of "what the heck?".
Some examples include:
=================
This is well-known PHP-trick. Use === to right result.
php > var_dump(md5('240610708') == md5('QNKCDZO'));
bool(true)
php > var_dump(md5('240610708'), md5('QNKCDZO'));
string(32) "0e462097431906509019562988736854"
string(32) "0e830400451993494058024219903391"
php > var_dump(md5('240610708') === md5('QNKCDZO'));
bool(false)
php > var_dump("0e462097431906509019562988736854" ==
"0e830400451993494058024219903391");
bool(true)
php > var_dump("0e462097431906509019562988736854" ===
"0e830400451993494058024219903391");
bool(false)
php > var_dump(md5('240610708') === md5('QNKCDZO'));
bool(false)
php > var_dump(md5('240610708') == md5('QNKCDZO'));
bool(true)
php > var_dump(md5('240610708') === md5('QNKCDZO'));
bool(false)
=================
I'm guessing there is more than a bit of code that uses == to compare
passwords/etc. Something to be aware of.
--
Kurt Seifried -- Red Hat -- Product Security -- Cloud
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