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Re: aix 4.2 4.3.1, adb
From: troy () AUSTIN IBM COM (Troy A. Bollinger)
Date: Tue, 13 Jul 1999 21:37:01 -0500

Quoting GZ Apple (gzapple () 21cn com):

Local users can halt the operating system by 'adb' command under my AIX

This affects AIX 4.2.x and 4.3.x (including 4.3.2).  We're still working
on the official fix, but here's an excerpt from the soon-to-be-released

Any questions regarding this vulnerability or other AIX security holes
can be sent to security-alert () austin ibm com 

--------------------   8<   --------------------

    A temporary fix is available via anonymous ftp from:


    Filename                 sum              md5
    unix_mp.42.adb_hang_fix  00772  2693  960214a1945f2c70311283adc0b231a3
    unix_mp.43.adb_hang_fix  15044  3302  584d1c5ea0223110e2d8eba84388f526

    This temporary fix has not been fully regression tested.  The fix
    consists of a multiprocessor kernel which can be used on either a
    uniprocessor or multiprocessor machine.  There may be a slight
    performance penalty when using a multiprocessor kernel on a
    uniprocessor machine.

    Use the following steps (as root) to install the temporary fix:

    1.  Determine the version of the kernel fileset on your machine.

        # lslpp -l <fileset>

        If the version of the kernel fileset for your machine is not at
        the level described below, install the requisite APAR listed.
        This will help ensure that the temporary kernel fix will run

        Release        Fileset            Version        requisite APAR
        AIX 4.2.x      bos.mp or bos.up       IY00689
        AIX 4.3.x      bos.mp or bos.up        IY00727

    2. Uncompress and extract the fix.

        # uncompress < adb_hang.tar.Z | tar xf -
        # cd adb_hang

    3. Review and run the adb_hang.sh script to install the new kernel.

          # view ./adb_hang.sh
          # ./adb_hang.sh

    4. Reboot.

Troy Bollinger                            troy () austin ibm com
AIX Security Development        security-alert () austin ibm com
PGP keyid: 1024/0xB7783129 Troy's opinions are not IBM policy

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