Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
andreasdotorg's profile
andreasdotorg
andreasdotorg
andreasdotorg
@andreasdotorg

Tweets

andreasdotorg

@andreasdotorg

I'm a hacker, pretty much in the old school sense of the word. But I do know IT security too.

Joined April 2008

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      https://dl.packetstormsecurity.net/1106-exploits/ssh_preauth_freebsd.txt …

      4 replies 0 retweets 7 likes
    2. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      That’s a good one and valid, but not one of the bugs anyone else has brought up 😂. Besides, having bugs isn’t the issue. Resolving, reducing, and remaining well architected is the point.

      1 reply 0 retweets 4 likes
    3. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      Yep. And choosing a language that eliminates whole classes of exploitable vulnerabilities is part of good architecture in my book. I won't deny that OpenSSH is comparatively well written. But writing C is much harder than most people realize. Undefined behaviour everywhere.

      1 reply 1 retweet 20 likes
    4. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      Yeah no one is disagreeing. Ignoring better options isn’t the point. Acknowledging that good architecture is a choice is. It isn’t really “harder” now, either. In fact it’s easier today to write safe C than ever before. We know more & have better tools/OS guards. It’s easy now :)

      1 reply 0 retweets 3 likes
    5. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      Easy really is the wrong word here. And there's still stuff sanitizers and static analyzers don't see. There's still exploits despite mitigations. In most cases, there's just no need to waste cognitive load on low level details. Higher level languages are more economical.

      1 reply 0 retweets 8 likes
    6. Don A. Bailey‏ @DonAndrewBailey May 3
      Replying to @andreasdotorg

      I’m one of the best when it comes to finding 0day in C. :) but I know it’s easy now, to write safe C. You can disagree all you want, but the tools and mitigation’s are available. Our industry failure is not making access simple and straight forward.

      2 replies 0 retweets 2 likes
    7. andreasdotorg‏ @andreasdotorg May 3
      Replying to @DonAndrewBailey

      #define SIZE 8192 char buf[SIZE]; void cpy(struct foo* p, int count) { int n = count * sizeof(struct foo); if ((n < SIZE) && (n > 0)) memcpy(buf, p, n); } Safe or not? Why? How many people can spot this? Which tools? Far from easy.

      6 replies 1 retweet 10 likes
    8. Luis Servin‏ @lfservin May 4
      Replying to @andreasdotorg @DonAndrewBailey

      I might be in the zero category. What seems to be the problem? Is it that in the function declaration foo pointer is not declared const? Or is SIZE the problem?

      1 reply 0 retweets 0 likes
    9. andreasdotorg‏ @andreasdotorg May 4
      Replying to @lfservin @DonAndrewBailey

      Overflow of signed integers is undefined. It is usually twos complement behaviour, as the underlying hardware. However, the compiler has leeway with optimizations. Compile the above with gcc -O0, and it generates safe code. Compile with -O3, gcc eliminates the bounds check!

      3 replies 1 retweet 1 like
    10. PaX Team‏ @paxteam May 4
      Replying to @andreasdotorg @lfservin @DonAndrewBailey

      you sure you understand your own example? :) there's no UB in your code because 1. the multiplication is done in size_t (due to sizeof), 2. the int->size_t conversion is well defined, 3. the size_t->int conversion is implementation defined.

      1 reply 0 retweets 0 likes
      andreasdotorg‏ @andreasdotorg May 4
      Replying to @paxteam @lfservin @DonAndrewBailey

      You're right of course, this is what's going on. I accidentally demoed a different UB ("implementation defined" is just another way of saying "undefined behaviour").

      3:30 AM - 4 May 2018
      1 reply 0 retweets 0 likes
        1. PaX Team‏ @paxteam May 4
          Replying to @andreasdotorg @lfservin @DonAndrewBailey

          no, it's not, the two are very different. one results in a defined program, the other does not. now whether you like the resulting defined behaviour is another question which is why programmers have the task of, well, doing their job and write programs with desirable behaviour :)

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2018 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info