Exam AWS Certified Security - Specialty All Questions

View all questions & answers for the AWS Certified Security - Specialty exam

Exam AWS Certified Security - Specialty topic 1 question 43 discussion

Exam question from Amazon's AWS Certified Security - Specialty

Question #: 43
Topic #: 1

[All AWS Certified Security - Specialty Questions]

A Developer's laptop was stolen. The laptop was not encrypted, and it contained the SSH key used to access multiple Amazon EC2 instances. A Security
Engineer has verified that the key has not been used, and has blocked port 22 to all EC2 instances while developing a response plan.
How can the Security Engineer further protect currently running instances?

A. Delete the key-pair key from the EC2 console, then create a new key pair.
B. Use the modify-instance-attribute API to change the key on any EC2 instance that is using the key.
C. Use the EC2 RunCommand to modify the authorized_keys file on any EC2 instance that is using the key.
D. Update the key pair in any AMI used to launch the EC2 instances, then restart the EC2 instances.

Show Suggested Answer

Suggested Answer: C 🗳️

by BillyC at Aug. 27, 2019, 2:47 p.m.

Disclaimers:

- ExamTopics website is not related to, affiliated with, endorsed or authorized by Amazon.
- Trademarks, certification & product names are used for reference only and belong to Amazon.

Comments

Submit Cancel

DP15

Highly Voted 3 years, 10 months ago

Yes C is correct - Modify authorized_keys with new key. It will save lot of time and there will be no need to stop the running instance. After can login again only with new key and old key will not work anymore.

upvoted 41 times

BillyC

3 years, 10 months ago

thanks!!

upvoted 2 times

...

Bach999

3 years, 10 months ago

https://aws.amazon.com/premiumsupport/knowledge-center/new-user-accounts-linux-instance/

upvoted 1 times

...

madcloud

Highly Voted 2 years, 10 months ago

C for sure, the reason is that, for a rogue user/admin, using his Access/Secure Keys, he can generate STS session tokens that last for 3 days. The session token will allow him to access EC2 instances even if the Access key/secret key is deleted or updated . you will see a new profile under the authorized_key directory for the STS tokens. hope this helps

upvoted 7 times

MikeDuB

2 years, 8 months ago

Thanks boss

upvoted 2 times

...

habros

Most Recent 8 months ago

Selected Answer: C

The key pair specified in the initial setup is for cloud-init to configure the public key in .ssh, does not imply anything beyond that.

upvoted 1 times

...

liuyomz

2 years ago

Selected Answer: C

C, the thing is you could never change the key_pair manually if you could not log into the instance (since you don't have the key anymore), but SSM uses a role to access it, so it's still possible.

upvoted 2 times

...

diego1984

2 years, 1 month ago

Selected Answer: C

C is correct

upvoted 1 times

...

Manikandan997

3 years, 3 months ago

What’s the answer for this C or d

upvoted 1 times

...

CollinsWolf

3 years, 5 months ago

The answer is the D. Create a new AMI of the existing instance and then launch a new instance. link is here https://aws.amazon.com/premiumsupport/knowledge-center/ec2-windows-replace-lost-key-pair/

upvoted 1 times

Appsec977

3 years, 2 months ago

No, The access won't be revoked by doing so. The key must be deleted from authorized_keys.

upvoted 2 times

...

Radhaghosh

3 years, 6 months ago

C is Correct Answer

upvoted 1 times

...

sanjaym

3 years, 9 months ago

Ans: C 100%

upvoted 2 times

...

NANDY666

3 years, 9 months ago

C is Correct

upvoted 1 times

...

mvsnogueira

3 years, 9 months ago

C "You can't launch a new instance using a deleted key pair, but you can continue to connect to any instances that you launched using a deleted key pair, as long as you still have the private key (.pem) file.", So letter A will not solve the question.

upvoted 3 times

...

devjava

3 years, 9 months ago

Ans > C

upvoted 1 times

...

AfricanCloudGuru

3 years, 9 months ago

Ans (C) https://aws.amazon.com/premiumsupport/knowledge-center/new-user-accounts-linux-instance/

upvoted 2 times

...

AfricanCloudGuru

3 years, 9 months ago

Ans (C) https://aws.amazon.com/premiumsupport/knowledge-center/new-user-accounts-linux-instance/

upvoted 1 times

...

Ivandrago

3 years, 10 months ago

C is Correct...even if you delete the key pair the backup key will remain in EC2

upvoted 1 times

...

RaySmith

3 years, 10 months ago

C is correct

upvoted 1 times

...

Zhongkai

3 years, 10 months ago

But the doc is pointing to A

upvoted 1 times

Moid

3 years, 10 months ago

I think the correct answer is A + C

upvoted 1 times

...

SHoKMaSTeR

3 years, 10 months ago

"How can the Security Engineer further protect currently running instances?" If you don't delete the key from authorized_keys although you have created a new one you will be able to access using the old one. Then you can create a new one and add it to the authorized_keys file. In addition, SSH could be exposed to a different port than 22 in the EC2 instances.

upvoted 4 times

...

Load full discussion...