Cloud Security Audit

Cloud Security Audit is a command line tool that scans for vulnerabilities in your AWS Account. In an easy way, you will be able to identify unsecure parts of your infrastructure and prepare your AWS account for a security audit.

Install

$GOPATH $ go get github.com/Appliscale/cloud-security-audit
$GOPATH $ cd cloud-security-audit
cloud-security-audit $ make all

Use

Initialising Session

If you’re using MFA you need to tell Cloud Security Audit to authenticate you before trying to connect by using flag --mfa. Example:

$ cloud-security-audit --service s3 --mfa --mfa-duration 3600

EC2 Scan

How to use

To perform audit on all EC2 instances, type:

$ cloud-security-audit --service ec2

You can narrow the audit to a region, by using the flag -r or --region. Cloud Security Audit also supports AWS profiles – to specify profile use the flag -p or --profile.

Example output

+---------------+---------------------+--------------------------------+-----------------------------------+----------+

| AVAILABILITY  |         EC2         |            VOLUMES             |             SECURITY              |          |

|               |                     |                                |                                   | EC2 TAGS |

|     ZONE      |                     |     (NONE) - NOT ENCRYPTED     |              GROUPS               |          |

|               |                     |                                |                                   |          |

|               |                     |    (DKMS) - ENCRYPTED WITH     |    (INCOMING CIDR = 0.0.0.0/0)    |          |

|               |                     |         DEFAULT KMSKEY         |                                   |          |

|               |                     |                                |       ID : PROTOCOL : PORT        |          |

+---------------+---------------------+--------------------------------+-----------------------------------+----------+

| eu-central-1a | i-0fa345j6756nb3v23 | vol-0a81288qjd188424d[DKMS]    | sg-aaaaaaaa : tcp : 22            | App:some |

|               |                     | vol-0c2834re8dfsd8sdf[NONE]    | sg-aaaaaaaa : tcp : 22            | Key:Val  |

+---------------+---------------------+--------------------------------+-----------------------------------+----------+

How to read it

1. First column AVAILABILITY ZONE contains information where the instance is placed
2. Second column EC2 contains instance ID.
3. Third column Volumes contains IDs of attached volumes(virtual disks) to given EC2. Suffixes meaning:
   • [NONE] – Volume not encrypted.
   • [DKMS] – Volume encrypted using AWS Default KMS Key. More about KMS you can find here
4. Fourth column Security Groups contains IDs of security groups that have too open permissions. e.g. CIDR block is equal to 0.0.0.0/0(open to the whole world).
5. Fifth column EC2 TAGS contains tags of a given EC2 instance to help you identify purpose of this instance.

Docs

You can find more information about encryption in the following documentation:

1. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html

S3 Scan

How to use

To perform audit on all S3 buckets, type:

$ cloud-security-audit --service s3

Cloud Security Audit supports AWS profiles – to specify profile use the flag -p or --profile.

Example output

+------------------------------+---------+---------+-------------+------------+

|          BUCKET NAME         | DEFAULT | LOGGING |     ACL     |  POLICY    |

|                              |         |         |             |            |

|                              |   SSE   | ENABLED |  IS PUBLIC  | IS PUBLIC  |

|                              |         |         |             |            |

|                              |         |         |  R - READ   |  R - READ  |

|                              |         |         |             |            |

|                              |         |         |  W - WRITE  | W - WRITE  |

|                              |         |         |             |            |

|                              |         |         | D - DELETE  | D - DELETE |

+------------------------------+---------+---------+-------------+------------+

| bucket1                      | NONE    | true    | false       | false      |

+------------------------------+---------+---------+-------------+------------+

| bucket2                      | DKMS    | false   | false       | true [R]   |

+------------------------------+---------+---------+-------------+------------+

| bucket3                      | AES256  | false   | true [RWD]  | false      |

+--------------------------- --+---------+---------+-------------+------------+

How to read it

1. First column BUCKET NAME contains names of the s3 buckets.
2. Second column DEFAULT SSE gives you information on which default type of server side encryption was used in your S3 bucket:

• NONE – Default SSE not enabled.
• DKMS – Default SSE enabled, AWS KMS Key used to encrypt data.
• AES256 – Default SSE enabled, AES256.

3. Third column LOGGING ENABLED contains information if Server access logging was enabled for a given S3 bucket. This provides detailed records for the requests that are made to an S3 bucket. More information about Server Access Logging can be found here
4. Fourth column ACL IS PUBLIC provides information if ACL (Access Control List) contains permissions, that make the bucket public (allow read/writes for anyone). More information about ACLs here
5. Fifth column POLICY IS PUBLIC contains information if bucket’s policy allows any action (read/write) for an anonymous user. More about bucket policies here R, W and D letters describe what type of action is available for everyone.

Docs

You can find more about securing your S3’s in the following documentations:

1. https://docs.aws.amazon.com/AmazonS3/latest/dev/serv-side-encryption.html
2. https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerLogs.html
3. https://docs.aws.amazon.com/AmazonS3/latest/user-guide/server-access-logging.html

Copyright 2018 Appliscale

Source: https://github.com/Appliscale/