[UNIX] IBM AIX pioout BSS Buffer Overflow Vulnerability

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IBM AIX pioout BSS Buffer Overflow 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 set-uid root application, installed by default under multiple versions of IBM AIX, that is used to interface with the printer driver". Local exploitation of a buffer overflow vulnerability in IBM Corp.'s AIX operating system 'pioout' program allows attackers to execute arbitrary code with root privileges.

DETAILS

Vulnerable Systems:
* AIX version 5.2 and 5.3

The vulnerability exists due to insufficient input validation when copying
user-supplied data to a fixed-size buffer. By passing a long string as a
command line option, an attacker can cause an exploitable buffer overflow.

Analysis:
Exploitation of this vulnerability results in the execution of arbitrary
code with root privileges. In order to exploit this vulnerability, an
attacker must have access to execute the set-uid root 'pioout' program.

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

Vendor response:
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.
<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-2007-5764>
CVE-2007-5764

Disclosure timeline:
11/29/2007 - Initial vendor notification
12/03/2007 - Initial vendor response
01/23/2008 - Coordinated public disclosure


ADDITIONAL INFORMATION

The information has been provided by iDefense Labs.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=648>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=648



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