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ericlaw's profile
Eric Lawrence 🎻
Eric Lawrence 🎻
Eric Lawrence  🎻
@ericlaw

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Eric Lawrence  🎻

@ericlaw

Impatient optimist. Dad. Author and speaker. Created Fiddler & SlickRun. PM @ MSFT '01-'12, and '18- on @microsoftedge. My words are my own. he/him

Texas, USA
textslashplain.com
Joined May 2007

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    1. Georg Friedrich‏ @trickser26 Sep 24
      Replying to @andrewhowdencom

      I'm asking this question as I'm not familiar with CSP. But couldn't the atracker change the CSP or simply remove it from the header? When he has access to the server or the distributor that sounds like an easy thing to do.

      1 reply 0 retweets 0 likes
    2. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @trickser26

      Yes! This is an excellent point. There are a couple of ways to handle this; 1. Define the header in the webserver. This means that we have the additional security boundary of a Linux user, increases attacker cost... /1

      1 reply 0 retweets 0 likes
    3. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @andrewhowdencom @trickser26

      2. Implement it in the application, but in a way that's not trivial to override. In the case of 2, it's likely the attacker will be able to drop the CSP. You could set some sort of static analysis on the site to ensure CSP is present -- but it's a "turtles all the way down" /2

      1 reply 0 retweets 1 like
    4. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @andrewhowdencom @trickser26

      What would probably be ideal is some sort of "expiry" property of the CSP, such as that which is found on HSTS. cc @ericlaw -- do you know if there's a way to set a "persistent" CSP?

      2 replies 0 retweets 1 like
    5. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @andrewhowdencom

      (3/3)

      1 reply 0 retweets 0 likes
    6. Georg Friedrich‏ @trickser26 Sep 24
      Replying to @andrewhowdencom

      Wow thanks a lot. But in the case of a provider takeover case (1) doesn't sound like it can be used as a layer of protection. I'm assuming here that everybody can change a file that is owned by the root user when he has direct access to the harddrive (virtual harddrive)

      1 reply 0 retweets 1 like
    7. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @trickser26

      Yes! 100%. However, the mechanism I've seen to compromise this isn't "RCE to root", but rather just an admin that's used a terrible password on some common software, and someone that's brute forced it. In that case, they don't even get RCE on the server. Here, CSP will help?

      2 replies 0 retweets 1 like
    8. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @andrewhowdencom @trickser26

      (cc @gwillem who may disagree with me, and has much better knowledge of the statistics, and @ericlaw as this clarifies the risks I'm trying to mitigate).

      1 reply 0 retweets 1 like
    9. Willem de Groot‏ @gwillem Sep 24
      Replying to @andrewhowdencom @trickser26 @ericlaw

      It will help a bit, but once they got access to the CMS code, its trivial to add a magecart scraper to the server-side code, where it stays completely out of sight.

      1 reply 0 retweets 1 like
    10. Voodoo Artisan (@ London)‏ @andrewhowdencom Sep 24
      Replying to @gwillem

      Yah but "connect-src" will catch it egressing? The POST from ajax. Unless it goes back to server and then out, and then you're completely outside CSP

      2 replies 0 retweets 1 like
      Eric Lawrence  🎻‏ @ericlaw Sep 24
      Replying to @andrewhowdencom @gwillem

      CSP is not effective as DLP. There are a variety of ways to egress data that CSP cannot block.

      5:11 AM - 24 Sep 2018
      • 1 Retweet
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      • Voodoo Artisan (@ London)
      0 replies 1 retweet 1 like

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