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Bug #9353 Require command reads /etc/passwd
Submitted: 2001-02-20 09:26 UTC Modified: 2001-02-20 13:35 UTC
From: sebastian at wolfgarten dot com Assigned:
Status: Closed Package: Unknown/Other Function
PHP Version: 4.0.1pl2 OS: Linux
Private report: No CVE-ID: None
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From: sebastian at wolfgarten dot com
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 [2001-02-20 09:26 UTC] sebastian at wolfgarten dot com
Hello,

I have found a bug in PHP 4.01pl2 and maybe it exist in all other php versions too. A php script can read all files on the system when the read flag for everyone is set for that file. This code shows the problem:

<?
    require('../../../../../../../etc/passwd');
?>

It is not a very serious bug but by reading local files a hacker might get important information he (or she) could use to hack into the system.

Bye
Sebastian Wolfgarten

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 [2001-02-20 13:35 UTC] sas@php.net
Please check out the security section of the manual, 
especially regarding the safe mode feature.

 
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