AWS Altering ARNs in Belief Insurance policies — Huge Issues | by Teri Radichel | Cloud Safety | Oct, 2022 | Community Tech

very practically AWS Altering ARNs in Belief Insurance policies — Huge Issues | by Teri Radichel | Cloud Safety | Oct, 2022 will cowl the most recent and most present suggestion with regards to the world. admission slowly for that purpose you comprehend capably and accurately. will accumulation your information expertly and reliably

It is a continuation of my collection on automating cybersecurity metrics.

Whereas updating my code in earlier posts, the KMSAdmin consumer was inadvertently eliminated, so I used to be unable to handle the KMS keys by assuming the related KMS function. The consumer was faraway from the KMS directors group. The developer consumer was additionally faraway from the AppDeployment group, which hampered deployments for that function.

I’ve tried re-running the CloudFormation templates that add customers to teams. Because the template hadn’t modified, operating it once more has no impact. CloudFormation solely deploys templates which have modified, not issues which are out of sync with what must be deployed.

If you happen to’ve been following, you realize I added an output to power replace each time a KMS secret’s deployed to resolve this difficulty when AWS magically alters the ARNs in key insurance policies. I attempted that method once more for this drawback.

Since I would like a timestamp twice now, I created a shared operate for it (the abstraction precept I have been telling you about repeatedly, do not repeat your self or the DRY precept):

I added the timestamp to my add_user_to_group operate:

Sadly, that did not work for this state of affairs. I preserve getting an error that the KMS administrator can not assume the group function.

Go to the belief coverage. AHA. AWS does the identical factor for belief insurance policies because it does for KMS key insurance policies and would not replace for a similar causes. Apparently the deleted consumer’s ARN was changed with some type of logical ID and the coverage is now not appropriate, nor does something associated to it work.

Move the function so as to add the timestamp to power an replace identical as above. Good factor I made get_timestamp a standard operate. 🙂

OK, issues are getting bizarre. My function is unquestionably to redeploy with the pressured replace. I can see the brand new parameter and the output within the template in CloudFormation. I can see that the proper KMS admin consumer was handed as a parameter. The stack is proven updated. There are not any errors within the deployment script.

And but… the belief coverage has not been up to date. It is a drawback.

If I attempt to take away the function in CloudFormation it’s going to fail as a result of all the important thing insurance policies reference it. And lots of issues seek advice from all of the keys.


So now I might manually replace the belief coverage, however that will be dangerous. And it is at this level that I understand that is going to be a single weblog submit as a result of that is very, very problematic.

I actually don’t assume Amazon must be altering buyer insurance policies. 

So what can we do about it? I can attempt to power the belief coverage in another means because the power replace parameter would not work. I can quickly add one other consumer to the belief coverage after which take away it once more, possibly.

What occurs if I modify the title of the group?

Properly, possibly the group simply would not replace the belief coverage…

What occurs if I modify enable to disclaim?

Luckily, my IAM function is in a separate deployment script; in any other case it will block my IAM admin if I had eliminated that consumer and group addition as properly. You may additionally extract the KMS supervisor right into a separate script, as I do not need this variation to use to all different belief insurance policies when making an attempt to power this replace. That appears safer. Let’s do this.

take a look

Properly, one thing occurred however not what we wished. The replace failed. Here’s a bug:

That is why:

Let’s change it again to Enable and attempt to determine one thing else out.

And now we have now a giant mess:

That is the type of nightmare you will get into with CloudFormation and the truth that AWS is altering these insurance policies with out the client figuring out is a giant deal for my part. This does not appear to be the proper answer for no matter drawback it was supposed to unravel. Please cease doing this. #awswishlist

Let's take into consideration this for a minute. If a consumer is deleted and a coverage references an ARN for a useful resource that doesn't exist, what's the threat? Nothing can use that coverage as a result of no associated consumer exists to make use of the permission. There isn't a have to delete the consumer on this coverage in that case.However ...if somebody does re-add the consumer again in with the identical ARN, that consumer can now use the permissions within the coverage. However is it actually the identical consumer? Somebody might delete a consumer and add again in a single they've credentials for to achieve entry to some permissions they should not have. That's the threat AWS is making an attempt to guard you in opposition to.Nevertheless, I might argue that it will be higher to warn the consumer earlier than making the change and disallow the change, or optionally enable the consumer so as to add a deny assertion for that ARN to the coverage relatively than simply change the coverage and mangle a buyer's complete stack of sources within the course of. I am positive somebody at AWS can consider a greater answer primarily based on how issues work behind the scenes than what is occurring above.

Fortunately I am solely in a POC atmosphere and I can actually delete every little thing and begin over. I ought to most likely write a script for that…

Subsequent submit.

Teri Radichel

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