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                                    CERT-Renater

                         Note d'Information No. 2008/VULN074
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DATE                      : 25/02/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Solaris 10 running DTrace.

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Solution Type Sun Alert

Solution  231803: Security Vulnerability in the Solaris 10 DTrace
Dynamic Tracing Framework May Allow Unauthorized Kernel Level Tracing

Bug ID: 6458281
Product: Solaris 10 Operating System

SA Document Body

Security Vulnerability in the Solaris 10 DTrace Dynamic Tracing
Framework May Allow Unauthorized Kernel Level Tracing


1. Impact

    A security vulnerability in the Solaris 10 DTrace (see dtrace(1M))
    dynamic tracing framework may allow a local user or a non-global
    zone which has been granted either the PRIV_DTRACE_USER or the
    PRIV_DTRACE_PROC privilege (see privileges(5)) to be able to
    perform some kernel-level tracing.  Such users may then be able
    to access sensitive information.


2. Contributing Factors

    This issue can occur in the following releases:

    SPARC Platform:

       * Solaris 10 without patch 120011-04

    x86 Platform:

       * Solaris 10 without patch 120012-04

    Note: Solaris 8 and Solaris 9 are not affected by this issue.


3. Symptoms

    There are no predictable symptoms that would indicate the described
    issue has been exploited to view sensitive kernel data.


4. Workaround

    If users have been granted any of the DTrace privileges, those
    privileges can be removed until the patches have been applied.
    The additional privileges may have been configured via policy.conf(4)
    or user_attr(4). If the privileges have been configured directly
    in the local "/etc/user_attr" file, they can be removed (as
    "root" user) with the usermod(1M) utility as in the following
    example:

    # usermod -K limitpriv=all,!dtrace_user,!dtrace_proc user

    If non-global zones have been granted any of these privileges,
    they can be removed with zonecfg(1M) as in the following example:

    # zonecfg -z <zone name>
    zonecfg:<zone-name> set limitpriv="default"
    zonecfg:<zone-name> commit
    zonecfg:<zone-name> exit

    In order for this change to take effect, reboot the zone after
    the zone configuration is changed.

    Note: Privileges may also be assigned via an execution profile
    (see exec_attr(4)) or even to running processes using ppriv(1).


5. Resolution

    This issue is addressed in the following releases:

    SPARC Platform:

       * Solaris 10 with patch 120011-04 or later

    x86 Platform:

       * Solaris 10 with patch 120012-04 or later

    For more information on Security Sun Alerts, see Sun Infodoc
    91209.


    This Sun Alert notification is being provided to you on an "AS
    IS" basis. This Sun Alert notification may contain information
    provided by third parties. The issues described in this Sun Alert
    notification may or may not impact your system(s). Sun makes no
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    Alert notification contains Sun proprietary and confidential
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    Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle,
    Santa Clara, CA 95054 U.S.A. All rights reserved.

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