Michael AM Felt

Michael AM Felt




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Recent Posts

  • RBAC and SUDO on AIX
    05/05/2017
  • Getting Back to RBAC
    04/11/2017
  • AIX and NTP
    02/16/2017
  • “Hard to be Current” with OSS
    01/26/2017
  • Using Internet Key Exchange Today
    12/14/2016
  • RBAC and SUDO on AIX

    I have a confession to make: Whenever I thought about SUDO I always thought in terms of SUDO versus RBAC, rather than RBAC and SUDO.

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    Posted: May 05, 2017 |

    Getting Back to RBAC

    Five years ago I was writing a lot more about RBAC—and I had a theme to "test" RBAC. I called the theme "Never look back" and I installed a few sandbox systems and ran a few "crazy" commands to see where things broke.

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    Posted: April 11, 2017 |

    AIX and NTP

    By default AIX uses NTPv3. This probably works fine for an internal-only situation (I hope), but for a server that also talks with the "outside," I recall that NTP shows up fairly frequently in CVE messages.

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    Posted: February 16, 2017 |

    “Hard to be Current” with OSS

    As I mentioned in a tweet, ZLIB (aka libz) has been updated recently. I expect these sudden updates from version 1.2.8 to 1.2.10 were inspired by an audit performed at the request of MOSS/Secure Open Source.

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    Posted: January 26, 2017 |

    Using Internet Key Exchange Today

    Internet Key Exchange (IKE) has gone through a lot of changes in the last 20 years. The last major change was the introduction of IKEv2 and communication via port 8500 rather than ports 500 and/or 4500 for setting up what is known as Phase 1 Tunnels.

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    Posted: December 14, 2016 |

    SENDMAIL SSL efix: a Painless ifix

    There is a good chance you are not using sendmail at all (on AIX) to receive mail. However, if you are, you should be using sendmail plus ssl. If you are using sendmail and ssl you have probably applied the fix suppiled last August (First Issued: Fri Aug  7 15:15:59 CDT 2015 |Updated: Tue Aug 18 09:19:51 CDT 2015.

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    Posted: May 12, 2016 |

    Using AIXPERT to Generate Compliance Reports

    AIXPERT is an easy to use interface to both harden and verify compliance with one or more standards. A standard can be one published by a third party (e.g., CIS), one from core AIX, one from PowerSC or one of these copied and customised for your situation. The format is XML.

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    Posted: April 12, 2016 |

    Getting Ready for Tomorrow's Cryptography Demands

    A comment from a reader (thanks again) reminded me about the compile/build option of no OpenSSL or libreSSL. And as he comments, this does simplify the maintenance of OpenSSH - one less library to support.

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    Posted: September 28, 2015 |

    OpenSSL, Sendmail and the LOGJAM Vulnerability

    In my last blog, I wrote about keeping OpenSSL current via the webpacks. In part, that's because OpenSSL is something to blog about. Please note that there are really important CVEs to be patched - but if you look at the recent Java patches - patches are also needed to fix the following OpenSSL related CVEs:

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    Posted: August 12, 2015 |

    How to Keep OpenSSL Up-to-Date

    Keeping OpenSSL up-to-date is becoming a chore. And waiting for an update in a service pack may not be the best way to do this - for many reasons.
     
     

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    Posted: August 03, 2015 |

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