[UNIX] IBM AIX pioout Arbitrary Library Loading Vulnerability

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IBM AIX pioout Arbitrary Library Loading Vulnerability
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SUMMARY

The
<http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds4/pioout.htm> 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.

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.

DETAILS

Vulnerable Systems:
* AIX version 5.3 with service pack 6.
* (Previous versions may also be affected).

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.

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

Vendor Status:
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.
<http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1>

http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4003>
CVE-2007-4003

Disclosure Timeline:
* 06/05/2007 - Initial vendor notification
* 06/08/2007 - Initial vendor response
* 07/26/2007 - Coordinated public disclosure

ADDITIONAL INFORMATION

The information has been provided by iDefense.
The original article can be found at:

<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=569>

http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=569

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