[UNIX] Hewlett Packard HP-UX ftpd Remote Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 12/22/04

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Date: 22 Dec 2004 11:15:03 +0200

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      Hewlett Packard HP-UX ftpd Remote Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    HP-UX FTP Daemon is a service included in HP-UX that implements the File
    Transfer Protocol. Remote exploitation of a buffer overflow vulnerability
    in the file transfer protocol (FTP) daemon included in multiple versions
    of Hewlett Packard Development Co.'s (HP) HP-UX allows attackers to gain
    remote root access in certain configurations.

    DETAILS

    Vulnerable Systems:
     * HP-UX version 11.11i

    The problem specifically exists when the FTP daemon is configured via
    /etc/inetd.conf to log debug information using -v switch. This is a not a
    default configuration option. When parsing a long command request, an
    exploitable stack overflow will occur. The overflow occurs before
    authentication, thus eliminating the need for a local or anonymous FTP
    account.

    Analysis:
    Exploitation of this vulnerability allows unauthenticated remote attackers
    to execute arbitrary code under the privileges of the FTP daemon server,
    usually root. The severity of this issue is mitigated by the fact that in
    most production environments, administrators will not be using the
    debug-logging feature of FTP daemon.

    Detection:
    To determine if a specific configuration is vulnerable, check
    /etc/inetd.conf for the ftpd line and see if the debug switch is enabled:
    grep 'ftpd' /etc/inetd.conf | grep -- -v

    If the above command returns text, then the FTP daemon is running in debug
    mode.

    Workaround:
    Do not use the -v flag in the FTP daemon entry line in /etc/inetd.conf. If
    debug-logging is necessary, consider allowing only trusted hosts access to
    the service using firewall rules or TCP wrappers.

    Vendor response:
    This vulnerability was addressed in the following patches:
     * HP-UX B.11.00: PHNE_29460
     * HP-UX B.11.04: PHNE_31034
     * HP-UX B.11.11: PHNE_29461
     * HP-UX B.11.22: PHNE_29462

    Disclosure timeline:
    12/02/2004 - Initial vendor notification
    12/03/2004 - Initial vendor response
    12/21/2004 - Public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:customerservice@idefense.com> iDEFENSE.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=175&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=175&type=vulnerabilities

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