[UNIX] CSVForm (Perl CGI) Remote Execution Vulnerability
From: support@securiteam.comDate: 12/14/01
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From: support@securiteam.com To: list@securiteam.com Date: Fri, 14 Dec 2001 16:13:35 +0100 (CET)
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CSVForm (Perl CGI) Remote Execution Vulnerability
------------------------------------------------------------------------
SUMMARY
<http://www.ezscripting.com/scripts/csvform1.html> CSVForm is a Perl
script designed to add records to a CSV database file. A security
vulnerability in the product allows attackers to cause the program to
execute arbitrary code.
DETAILS
Vulnerable systems:
CSVForm.pl v0.1 (and possibly CSVFormPlus)
This script does not appear to be actively maintained yet it does appear
to be used on a number of web sites. Unfortunately, for those who adhere
to the author's request to notify him of its use, they may be particularly
vulnerable if they happen to be listed under the "Check out sites using
our scripts" link located on the homepage.
Problem description:
Examining the script shows that after the query is parsed and the
parameter of file is obtained, it is passed directly to the following code
sample unfiltered.
sub modify_CSV
{
if(open(CSV,$_[0])){
}
else{
goto &produce_error(
"Can't open CSV file.\n",
"Please, check that you have provided the cgi script with
correct CSV file",
" path in the HTML form.\n"
);
}
Exploit:
http://server/cgi-bin/csvform.pl?file=COMMAND_GOES_HERE%00|
Workaround:
Hardcode path to CSV data file or apply proper input validation.
ADDITIONAL INFORMATION
The information has been provided by <mailto:jgomes@strataone.com> Jason
Gomes.
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