iDEFENSE Security Advisory 02.10.05: IBM AIX lspath Local File Access Vulnerability

From: iDefense Customer Service (customerservice_at_idefense.com)
Date: 02/10/05

  • Next message: Martin Schulze: "[SECURITY] [DSA 674-1] New mailman packages fix several vulnerabilities"
    Date: Thu, 10 Feb 2005 10:59:01 -0500
    To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>
    
    

    IBM AIX lspath Local File Access Vulnerability

    iDEFENSE Security Advisory 02.10.05
    www.idefense.com/application/poi/display?id=195&type=vulnerabilities
    February 10, 2005

    I. BACKGROUND

    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.

    II. DESCRIPTION

    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.

    III. ANALYSIS

    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
    unskilled attackers.

    IV. DETECTION

    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.

    V. WORKAROUND

    Only allow trusted users local access to security critical systems.
    Alternately, remove the setuid bit from lspath using chmod u-s
    /usr/sbin/lspath

    VI. VENDOR RESPONSE

    Vendor advisories for this issue are available at:

    For AIX 5.2:

    https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs?mod
    e=1&heading=AIX52&topic=SECURITY&month=ALL

    For AIX 5.3:

    https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs?mod
    e=1&heading=AIX53&topic=SECURITY&month=ALL

    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

    IX. CREDIT

    iDEFENSE Labs is credited with this discovery.

    Get paid for vulnerability research
    http://www.idefense.com/poi/teams/vcp.jsp

    X. LEGAL NOTICES

    Copyright (c) 2005 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
    email 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.


  • Next message: Martin Schulze: "[SECURITY] [DSA 674-1] New mailman packages fix several vulnerabilities"

    Relevant Pages