Amazon Web Services (AWS) S3
The Amazon Web Services (AWS) S3 integration detects a variety of data loss prevention, account misconfiguration, and user security risks in an integrated AWS account that could leave you and your organization vulnerable.
Integration prerequisites
- An AWS account using AWS S3 (Simple Storage Service)
- For initial setup, access to the AWS account with permission to create a new IAM Role with the scopes listed below.
Integration permissions
For the AWS S3 integration to function, Cloudflare CASB requires the following access scopes via an IAM Role with cross-account access:
s3:PutBucketNotifications3:GetObjects3:ListBucket
These permissions follow the principle of least privilege to ensure that only the minimum required access is granted. To learn more about each permission scope, refer to the AWS S3 Permissions documentation ↗.
Security findings
The AWS S3 integration currently scans for the following findings, or security risks. Findings are grouped by category and then ordered by severity level.
To stay up-to-date with new CASB findings as they are added, bookmark this page or subscribe to its RSS feed.
S3 Bucket security
Flag security issues in S3 Buckets, including overpermissioning, access policies, and user security best practices.
| Finding type | FindingTypeID | Severity |
|---|---|---|
| S3 Bucket ACL Allows Any Authenticated User to Write | 09bc7d1f-e682-43bc-a4ce-e6e03b408244 | Critical |
| S3 Bucket ACL Allows Any Authenticated User to Write ACP | 9392a460-c566-4e0d-b06b-01d87dc84d7c | Critical |
| S3 Bucket ACL Allows Public ACP Write | 5b792c7f-2546-4fcd-96dc-a58a53fea7e0 | Critical |
| S3 Bucket ACL Allows Public Write | f50ae197-fa0a-4caa-be95-79aed91eed63 | Critical |
| S3 Bucket Policy Allows Any Authenticated User to Write | 70fe0596-28bc-41dd-a2c3-1486fb0fb1dd | Critical |
| S3 Bucket Policy Allows Public Write | 5e2aac4b-d8be-43dc-b324-84fdf63f760e | Critical |
| S3 Bucket Publicly Accessible | 6b1276e3-88e8-4150-a4d5-1b8273f11078 | Critical |
| S3 Bucket ACL Allows Any Authenticated User to Read | fda31c4d-24dc-43d4-8a84-a1a9e1df01a1 | High |
| S3 Bucket ACL Allows Any Authenticated User to Read ACP | 7232e46b-3539-4080-b905-022f1091556c | High |
| S3 Bucket ACL Allows Public ACP Read | e324242c-5feb-41a3-8d91-f70611471fad | High |
| S3 Bucket ACL Allows Public Read | f8c9f979-29f0-4ada-b09e-a149937a55d4 | High |
| S3 Bucket Policy Allows Any Authenticated User to Read | c6b3a745-b535-45ea-b2c0-ba8a139ca634 | High |
| S3 Bucket Policy Allows Public Read | f3915412-eef9-47d9-8448-e04462de8ba2 | High |
| S3 Bucket Without MFA Delete Enabled | f108bd28-9870-453f-a439-01818e85bdc7 | High |
| S3 Bucket Without Server-Side Encryption (SSE) | 7817b383-79c3-44ca-8d5d-e01748afe75b | High |
| S3 Bucket Encryption in Transit Disabled | 0b3227dd-63d3-46bc-97b3-e62d9c11567a | Medium |
| S3 Bucket MFA Delete Disabled | 518697ff-3f7e-463e-acf3-79d106599f0e | Medium |
| S3 Bucket ACL Allows Public List | e3c8a170-7817-4151-bd01-55442f4416ea | Medium |
| S3 Bucket Objects Can Be Public | 0ff170dc-be6b-46fa-a1cf-95ca7d067f4b | Medium |
| S3 Bucket Policy Allows Any Authenticated AWS User | 264be783-7fe1-4f50-aee7-d8df370b7b77 | Medium |
| S3 Bucket Policy Allows Any Authenticated User to Delete | 4431eaeb-63e3-43c1-a4bc-029f09da66fd | Medium |
| S3 Bucket Policy Allows Any Authenticated User to List | 319c9715-b86d-4215-bdfa-c5d9b3a5cc83 | Medium |
| S3 Bucket Policy Allows Public Delete | bbbeacbc-6692-4121-a785-d634da1e5c56 | Medium |
| S3 Bucket Policy Allows Public List | f7ae03e3-1303-4404-b6f5-a7f97e52105e | Medium |
| S3 Bucket Server Side Encryption Disabled | d69ab398-fba8-4e71-bf49-60af48d00cbc | Medium |
| S3 Bucket Without Access Logging | 67d0995d-7b4a-40c5-a43f-7a98d20faac6 | Medium |
| S3 Bucket Without AWS CloudTrail Logging | 89366ebe-ca0b-45fc-a9cb-135674e0a49b | Medium |
| S3 Bucket Without Cross-Region Replication | d4e5c815-33e3-4a01-b852-fe040d51ee55 | Medium |
| S3 Bucket Without Default Encryption | fb7a41af-294c-4e9b-a6ca-a1fed35542d6 | Medium |
| S3 Bucket Without Lifecycle Policies | 2df6f1b8-e41c-4ab5-a466-992ce485a367 | Medium |
| S3 Bucket Without Object-Level Logging | 9af2594c-3999-49c9-bd3d-2f4b091f99c0 | Medium |
| S3 Bucket Without Replication Enabled | cb61ef18-a498-456c-985c-78a45e19f4fe | Medium |
| S3 Bucket Without Versioning Enabled | 95e1284f-a514-4396-bf64-cd003818790c | Medium |
| S3 Bucket Access Logging Disabled | 84ba76fa-4703-490e-ab75-1b554993c054 | Low |
| S3 Bucket Lifecycle Disabled | 970d2ca8-e189-42a8-8e86-9f674fcb1aea | Low |
| S3 Bucket Policy Not Existent | 3e1d0535-d82f-4ed1-9664-d2c50905db17 | Low |
| S3 Bucket Versioning Disabled | 4e976e0d-b545-4c4a-99c5-a2f5d9a6f3d8 | Low |
IAM Policies
Identify AWS IAM-related security issues that could affect S3 Bucket and Object security.
| Finding type | FindingTypeID | Severity |
|---|---|---|
| IAM Account Password Policy Does Not Exist | e39ee4da-eed5-49d0-95f7-b423884b858c | Critical |
| IAM Account Password Policy Doesn’t Require Lowercase Letters | 9278444b-0c38-4ed0-8127-f3f25444811c | High |
| IAM Account Password Policy Doesn’t Require Passwords to Expire | 5be79a96-4570-45cf-8ba3-1abe62802d16 | High |
| IAM Account Password Policy Doesn’t Require Symbols | dd17afa3-4d4c-49e4-84c3-e829af9fff97 | High |
| IAM Account Password Policy Doesn’t Require Uppercase Letters | e4976e53-bab5-4276-a1d3-1d85ebfd4d57 | High |
| IAM Account Password Policy Max Age is greater than 90 days | 4e1092a0-7092-405f-a991-537d8c371440 | High |
| IAM Account Password Policy Minimum Length is less than 8 | 2a2fa181-7beb-48ba-bc8d-8f1170c6062c | High |
| IAM Account Password Policy Re-use Prevention is less than 5 | a4791a20-373f-44d3-9f6e-e61f1685fe05 | High |
| IAM Role with Cross-Account Access | 8de72710-b23a-4d94-915e-26ef7249d21e | High |
| IAM Access Key Inactive over 90 Days | 37d1adb1-8e37-4708-a849-e06945c60802 | Medium |
| IAM Access Key Not Rotated over 90 Days | d2caf571-4c99-4da7-a21c-4384f8cb4e5c | Medium |
| IAM User Console Login Inactive Over 90 Days | 82b50a4d-8582-4766-9bad-f41b441bf336 | Medium |
| IAM User MFA Disabled | 4679563f-5975-4c68-9dbf-896810ec8de9 | Medium |
| IAM User Password Older Than 90 Days | c5376384-e4e4-4b2c-af84-12d6740939f0 | Medium |
| IAM Account Password Policy Doesn’t Require Numbers | 15c65813-c7e6-4b22-95b3-b3942c8b8924 | Low |
Root User Management
Detect security issues related to the use of an IAM Root User, which has the ability to access and configure important settings.
| Finding type | FindingTypeID | Severity |
|---|---|---|
| AWS Root User Access Key Used within Last 90 Days | 9d23c002-aece-42b5-b082-2b51fab8d7c1 | Critical |
| AWS Root User has Access Keys | 1b788d31-ed56-4008-b136-6993f38e4d1c | Critical |
| AWS Root User Logged in within Last 90 Days | e9959d6e-edc9-4ea3-9113-3c30b02a811e | Critical |
| AWS Root User MFA Disabled | 19abe0ee-e8bd-4e3b-9ee9-ea5c64fe769c | Critical |
Certificates
Catch certificate-related issues and risks to prevent malicious compromise of internal resources.
| Finding type | FindingTypeID | Severity |
|---|---|---|
| ACM Certificate Expired | 30ce0a22-eb3d-457d-bc59-6468f9bb4c4f | Critical |
| ACM Certificate Has Domain Wildcard | d313bc0c-a2fb-41d8-b5a8-ef2704bb5570 | High |
| ACM Certificate Expires within 30 days | cd93f2c1-9b07-4e6c-964c-79f3a64d56ac | Medium |