Visit our newest sister site!
Hundreds of free aircraft flight manuals
Civilian • Historical • Military • Declassified • FREE!

TUCoPS :: Unix :: Various Flavours :: tb11795.htm

IBM AIX pioout Arbitrary Library Loading Vulnerability
iDefense Security Advisory 07.26.07: IBM AIX pioout Arbitrary Library Loading Vulnerability
iDefense Security Advisory 07.26.07: IBM AIX pioout Arbitrary Library Loading Vulnerability

IBM AIX pioout Arbitrary Library Loading Vulnerability

iDefense Security Advisory 07.26.07 
Jul 26, 2007


The pioout program is a setuid root application, installed by default
under multiple versions of IBM AIX, that is used to interface with the
printer driver. More information can be found at the following URL. 


Local exploitation of an arbitrary library loading vulnerability in the
'pioout' program, as included with IBM Corp.'s AIX operating system,
allows an attacker to execute arbitrary code with root privileges.

The vulnerability exists due to the application loading an arbitrary
shared library provided by the attacker, without dropping privileges.
Using the -R command line argument, an attacker can specify a shared
library used to parse data coming from the printer.


Exploitation of this vulnerability results in the execution of arbitrary
code with root privileges.

The pioout program is setuid root, and executable by any user with local
access. To exploit the vulnerability, all an attacker has to do is
create a shared library that executes a shell.


iDefense has confirmed the existence of this vulnerability in AIX
version 5.3 with service pack 6. Previous versions may also be


Removing the setuid bit from the binary will prevent exploitation, but
may make the program unusable by non-root users.


IBM Corp. has addressed this vulnerability by releasing interim fixes.
More information can be found via the Bulletins tab of IBM's
Subscription Service for UNIX and Linux servers. You can reach this
service by clicking the URL shown below. 


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4003 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for 
security problems.


06/05/2007  Initial vendor notification
06/08/2007  Initial vendor response
07/26/2007  Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research 

Free tools, research and upcoming events 


Copyright =A9 2007 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail for permission. 

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.

TUCoPS is optimized to look best in Firefox® on a widescreen monitor (1440x900 or better).
Site design & layout copyright © 1986-2015 AOH