iDEFENSE Security Advisory 02.10.05: IBM AIX lspath Local File Access Vulnerability
From: iDefense Customer Service (customerservice_at_idefense.com)
Date: Thu, 10 Feb 2005 10:59:01 -0500 To: <email@example.com>, <firstname.lastname@example.org>
IBM AIX lspath Local File Access Vulnerability
iDEFENSE Security Advisory 02.10.05
February 10, 2005
The lspath program is a setuid root application, installed by default
under newer versions of IBM AIX. It is used to display information about
MultiPath I/O devices.
Local exploitation of a file access vulnerability in the lspath command
included by default in multiple versions of IBM Corp.'s AIX operating
system could allow for the reading of one line of any file on the
system, regardless of permissions.
The problem specifically exists in the -f option. If a user specifies a
file with the -f option, the first line (up to the first space) in that
file will be displayed on the screen along with an error message.
The format of sensitive AIX authentication files (namely
/etc/security/passwd) limit the impact of this vulnerability due to the
fact that there is no protected data on the first line of the file.
However, exploitation does not require any knowledge of application
internals, making exploitation of this vulnerability trivial, even for
iDEFENSE has confirmed the existence of this vulnerability in lower
patch levels of IBM AIX version 5.2. It is suspected that previous
versions are also vulnerable.
Only allow trusted users local access to security critical systems.
Alternately, remove the setuid bit from lspath using chmod u-s
VI. VENDOR RESPONSE
Vendor advisories for this issue are available at:
For AIX 5.2:
For AIX 5.3:
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
12/21/2004 Initial vendor notification
01/07/2004 Initial vendor response
02/10/2004 Coordinated public disclosure
iDEFENSE Labs is credited with this discovery.
Get paid for vulnerability research
X. LEGAL NOTICES
Copyright (c) 2005 iDEFENSE, Inc.
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