[UNIX] Add2it Mailman Command Execution (File Writing)
From: support@securiteam.comDate: 02/16/02
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From: support@securiteam.com To: list@securiteam.com Date: Sat, 16 Feb 2002 13:55:54 +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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Add2it Mailman Command Execution (File Writing)
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SUMMARY
<http://www.add2it.com/scripts/mailman-free.shtml> Add2it Mailman Free is
a multilingual mailing list management script with full personalization
options and no size limitations that allows visitors to your website to
subscribe and unsubscribe to your mailing list without any work from you.
A security vulnerability in the product allows attackers to execute
arbitrary command or overwrite files by issuing a specially formed HTTP
request.
DETAILS
Vulnerable systems:
Add2it Mailman Free version 1.73
The problem is that the script does not filter input well:
$command = $ENV{'QUERY_STRING'};
($list, $email) = split(/=/,$command);
And then the script makes an open() call based on input from the user:
open(LIST, "${path}data/lists/$list");
There are also open() calls with > and >> which use $list.
The way to exploit this to write to a file would be:
./../../../file=data@to.write
Or for command execution:
./../../../bin/command|=blah@bleh.com
This exploit is for the free version of Add2it Mailman, but the same
vulnerability probably exists in the Pro version as well.
Fix:
Filter meta characters and use < << > >> with open()
Vendor status:
Author was contacted on 1/30/02 and replied the same day stating the
problem would be fixed in the next release.
ADDITIONAL INFORMATION
The information has been provided by <mailto:b0iler@hotmail.com> b0iler
_.
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