[20751] in bugtraq
Vulnerability in viewsrc.cgi
daemon@ATHENA.MIT.EDU (joetesta@hushmail.com)
Wed May 23 21:26:12 2001
From: joetesta@hushmail.com
Message-Id: <200105231642.JAA21850@user7.hushmail.com>
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To: bugtraq@securityfocus.com, gst@securitytracker.com
Date: Wed, 23 May 2001 12:45:37 -0800 (PDT)
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Vulnerability in viewsrc.cgi
Overview
viewsrc.cgi v2.0 is a source-code viewing CGI script available from
http://www.mimanet.com/scripts. A vulnerability exists which
allows a remote user to view any file on the server.
Details
The following URL demonstrates the problem:
http://localhost/cgi-bin/viewsrc.cgi?
loc=../[any file outside restricted directory]
Solution
Apply the following patch to viewsrc.cgi:
53a54,56
> $FORM{'loc'} =~ s/\.\.//g;
> $FORM{'loc'} =~ s/\\//g;
> $FORM{'loc'} =~ s/\///g;
65c68
< open (INHTML, "$predo") or die &err_loc;
---
> open (INHTML, "<$predo") or die &err_loc;
This patch removes any '..', '/', or '\'s present in the $FORM{'loc'}
variable. It also makes the open() command safer by using the '<'
read-only specifier.
Vendor Status
MIMAnet was contacted via <webmaster@mimanet.com> on
Tuesday, May 1, 2001. Roberto R. Morelli <morelli@altair7.com>
quickly replied and stated that the problem was verified and an
official fix would be released. Twenty two days have passed, and nothing
has been done.
- Joe Testa
e-mail: joetesta@hushmail.com
web page: http://hogs.rit.edu/~joet
AIM: LordSpankatron
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