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TUCoPS :: Unix :: Various Flavours :: tb11796.htm

IBM AIX capture Terminal Control Sequence Buffer Overflow Vulnerability



iDefense Security Advisory 07.26.07: IBM AIX capture Terminal Control Sequence Buffer Overflow Vulnerability
iDefense Security Advisory 07.26.07: IBM AIX capture Terminal Control Sequence Buffer Overflow Vulnerability



IBM AIX capture Terminal Control Sequence Buffer Overflow Vulnerability

iDefense Security Advisory 07.26.07
http://labs.idefense.com/intelligence/vulnerabilities/ 
Jul 26, 2007

I. BACKGROUND

The capture program is a setuid root application, installed by default
under multiple versions of IBM AIX, that allows terminal sessions to be
dumped to a file. More information can be found at the following URL.

http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds1/capture.htm 

II. DESCRIPTION

Local exploitation of a stack-based buffer overflow vulnerability in the
'capture' program, as included with IBM Corp.'s AIX operating system,
allows an attacker to execute arbitrary code with root privileges.

The vulnerability exists within the code that parses terminal control
sequences. A long series of control sequences will trigger an
exploitable stack-based buffer overflow.

III. ANALYSIS

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

The capture program is setuid root, and executable by any user with
local access. The vulnerability is a stack-based buffer overflow, and
is trivially exploitable.

IV. DETECTION

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

V. WORKAROUND

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

VI. 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 

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3333 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for 
security problems.

VIII. DISCLOSURE TIMELINE

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

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php 

Free tools, research and upcoming events
http://labs.idefense.com/ 

X. LEGAL NOTICES

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 customerservice@idefense.com 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.


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