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Home : Advisories : Global-3.55 allows world-wide executable cgi

Title: Global-3.55 allows world-wide executable cgi
Released by: NETBSD
Date: 26th October 2000
Printable version: Click here

                 NetBSD Security Advisory 2000-014


Topic: Global-3.55 allows world-wide executable cgi.

Version: any before 4.01

Severity: permits remote execution of arbitrary shell commands



When using the CGI interface of the Global v3.55 package, it's

possible to execute random commands.

Technical Details


The exploit of this is possible due to insufficient handling of quoted

or escaped characters in this version, and command line arguments that

are then handed off to shell commands.

Solutions and Workarounds


To find out if you have the problematic version of the global package

installed, type

pkg_info -e global

If this displays "global-3.55" or below, you are vulnerable.  If

this displays "global-4.0.1" or higher, your system is not vulnerable

either. If this displays no output at all, it means you don't have

the "global" package installed, and your system is not vulnerable.

If your system is vulnerable, the best solution is to upgrade to the latest

version in pkgsrc, which is 4.0.1 as of this writing.

There are precompiled binary packages of global for some NetBSD ports

available from:


If no precompiled binary is available for your platform, you can build

your own from source.  First, make sure that you have a version of the

pkgsrc hierarchy from October 9th 2000 or later.  (See

http://www.netbsd.org/Sites/net.html for ways to obtain NetBSD, and

pkgsrc, its packages collection.)

You can then install the new version of the package:

        cd pkgsrc/devel/global; make clean; make install

For more information on how to rebuild a package from source for your

architecture, see http://ftp.netbsd.org/pub/NetBSD/packages/pkgsrc/README

To render the vulnerability unexploitable, modify the file

'HTML/cgi-bin/global.cgi' around line 35, and change the generated HTML


$pattern =~ s/'//g;                     # to shut security hole


$pattern =~ s/"//g;                     # to shut security hole

Thanks To


The problem was reported in NetBSD PR 11165 by the author of global,

Shigio Yamaguchi . The package updated by as a

collaboration of Hubert Feyrer  and David Brownlee

. Hubert Feyrer also drafted this security advisory.

Revision History


20001009 First draft, after the pkg was committed by abs.

More Information


Information about NetBSD and NetBSD security can be found at

http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/.

Copyright 2000, The NetBSD Foundation, Inc.  All Rights Reserved.

$NetBSD: NetBSD-SA2000-014.txt,v 1.4 2000/10/24 14:50:55 agc Exp $


Version: 2.6.3ia

Charset: noconv







(C) 1999-2000 All rights reserved.