[UNIX] FAQmanager File Reading Vulnerability
From: support@securiteam.comDate: 01/09/02
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From: support@securiteam.com To: list@securiteam.com Date: Wed, 9 Jan 2002 21:14:45 +0100 (CET)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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FAQmanager File Reading Vulnerability
------------------------------------------------------------------------
SUMMARY
<http://www.fourteenminutes.com/code/faqmanager/> FAQmanager is a simple
perl script that allows you to easily set up and maintain an FAQ web site
(Frequently Asked Questions). A security vulnerability in the product
allows attackers to read any world readable file on the server.
DETAILS
Vulnerable systems:
FAQmanager versions prior to 2.2.6
Immune systems:
FAQmanager version 2.2.6 (partial fix)
FAQmanager can be used to read a file the server has access to.
Example:
http://host/cgi-bin/faqmanager.cgi?toc=/etc/passwd%00
This will show the system's /etc/passwd file.
Solution:
A solution would be to replace the untainted routine in the script with
this slightly modified one that filters out the null byte:
sub untaint
{
return "" if (!$_[0]);
my $taint = $_[0];
$taint =~ s/[\|\/]//g;
$taint =~ s/\0//gii;
$taint =~ /^[\<\+\>]*(.*)$/gi;
return $1; # _not_ return $taint
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:nu_omega_tau@altavista.com>
Nu Omega Tau.
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