CVE-2024-1456
📋 TL;DR
This CVE describes an S3 bucket takeover vulnerability in the h2oai/h2o-3 repository where the 'http://s3.amazonaws.com/h2o-training' bucket was vulnerable to unauthorized takeover. This allows attackers to claim control of the bucket and potentially host malicious content or intercept legitimate traffic. Organizations using h2o-3 that reference this S3 bucket are affected.
💻 Affected Systems
- h2oai/h2o-3
📦 What is this software?
H2o by H2o
⚠️ Risk & Real-World Impact
Worst Case
Attackers could host malicious content (malware, phishing pages) under the legitimate h2o-training domain, intercept sensitive data, or disrupt h2o-3 functionality that depends on this bucket.
Likely Case
Attackers could host malicious content that gets served to users who trust the h2o-training domain, potentially leading to malware infections or credential theft.
If Mitigated
If proper S3 bucket security controls are in place (proper ACLs, bucket policies), the bucket cannot be taken over and impact is prevented.
🎯 Exploit Status
S3 bucket takeover techniques are well-documented and automated tools exist. The vulnerability was discovered through a bug bounty program.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://huntr.com/bounties/7c1b7f27-52f3-4b4b-9d81-e277f5e0ab6b
Restart Required: No
Instructions:
1. Ensure the S3 bucket 'h2o-training' has proper security controls. 2. Verify bucket ownership and ACLs. 3. Implement proper bucket policies to prevent unauthorized access. 4. Monitor for any unauthorized changes to the bucket configuration.
🔧 Temporary Workarounds
Secure S3 Bucket Configuration
allImplement proper S3 bucket security controls including ACLs, bucket policies, and ownership verification
aws s3api put-bucket-acl --bucket h2o-training --acl private
aws s3api put-bucket-policy --bucket h2o-training --policy file://bucket-policy.json
Use Alternative Training Data Source
allConfigure h2o-3 to use alternative training data sources instead of the vulnerable S3 bucket
🧯 If You Can't Patch
- Implement network controls to block or monitor access to the vulnerable S3 bucket
- Use DNS filtering to prevent resolution of the vulnerable bucket domain
🔍 How to Verify
Check if Vulnerable:
Check if your h2o-3 configuration references 'http://s3.amazonaws.com/h2o-training' or test if the S3 bucket is publicly writable using AWS CLI: aws s3api get-bucket-acl --bucket h2o-trainingCheck Version:
Not applicable - this is a configuration issue, not a software version issueVerify Fix Applied:
Verify the S3 bucket has proper ACLs and policies: aws s3api get-bucket-acl --bucket h2o-training && aws s3api get-bucket-policy --bucket h2o-training📡 Detection & Monitoring
Log Indicators:
- AWS CloudTrail logs showing unauthorized PutBucketAcl, PutBucketPolicy, or PutBucketWebsite operations on the h2o-training bucket
- Unexpected changes to S3 bucket configuration
Network Indicators:
- Unexpected traffic to/from the h2o-training S3 bucket
- DNS queries for the bucket domain from unexpected sources
SIEM Query:
source="aws.cloudtrail" (eventName="PutBucketAcl" OR eventName="PutBucketPolicy" OR eventName="PutBucketWebsite") requestParameters.bucketName="h2o-training"