[Full-Disclosure] iDEFENSE Security Advisory 02.10.05: IBM AIX netpmon Local Buffer Overflow Vulnerability

idlabs-advisories_at_idefense.com
Date: 02/10/05

  • Next message: idlabs-advisories_at_idefense.com: "[Full-Disclosure] iDEFENSE Security Advisory 02.10.05: IBM AIX lspath Local File Access Vulnerability"
    Date: Thu, 10 Feb 2005 11:01:14 -0500
    To: <idlabs-advisories@idefense.com>
    
    

    IBM AIX netpmon Local Buffer Overflow Vulnerability

    iDEFENSE Security Advisory 02.10.05
    www.idefense.com/application/poi/display?id=197&type=vulnerabilities
    February 10, 2005

    I. BACKGROUND

    The netpmon program is a setuid root application, installed by default
    under multiple versions of IBM AIX, which can be used to monitor
    activity and report statistics on network I/O and network-related CPU
    usage.

    II. DESCRIPTION

    Local exploitation of a buffer overflow vulnerability in the netpmon
    command included by default in multiple versions of IBM Corp.'s AIX
    Operating System could allow for arbitrary code execution as the root
    user.

    The vulnerability specifically exists due to an unbounded string copying

    operation into stack memory. When provided with a long argument to the
    -O option (the ReportType option), the netpmon process will overwrite
    stack memory. This allows for the execution of arbitrary code by
    overwriting the saved return address.

    III. ANALYSIS

    Exploitation of this vulnerability is simple for a skilled attacker,
    however gid "system" is required in order to execute the vulnerable
    binary. Successful exploitation yields root access to the system.

    IV. DETECTION

    iDEFENSE has confirmed the existence of this vulnerability in 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; only

    allow trusted users access to the "system" group. Alternately, remove
    the setuid bit from netpmon using chmod u-s /usr/bin/netpmon

    VI. VENDOR RESPONSE

    Vendor advisories for this issue are available at:

    For AIX 5.1:

    https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs?mod
    e=1&heading=AIX51&topic=SECURITY&month=ALL

    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
    02/10/2005 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.

    _______________________________________________
    Full-Disclosure - We believe in it.
    Charter: http://lists.netsys.com/full-disclosure-charter.html


  • Next message: idlabs-advisories_at_idefense.com: "[Full-Disclosure] iDEFENSE Security Advisory 02.10.05: IBM AIX lspath Local File Access Vulnerability"

    Relevant Pages