CVE-2024-21684
📋 TL;DR
This is an open redirect vulnerability in Bitbucket Data Center that allows unauthenticated attackers to redirect users to arbitrary websites after login. Affected versions are 8.0.0-8.9.12 and 8.19.0-8.19.1, requiring user interaction for exploitation.
💻 Affected Systems
- Bitbucket Data Center
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Users redirected to malicious sites that steal credentials or deliver malware through phishing attacks.
Likely Case
Users redirected to phishing pages attempting credential theft or displaying unwanted content.
If Mitigated
Minimal impact with proper user awareness training and browser security controls.
🎯 Exploit Status
Requires user interaction (victim must click/login), making exploitation less reliable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.9.13 or 8.19.2
Vendor Advisory: https://jira.atlassian.com/browse/BSERV-19454
Restart Required: Yes
Instructions:
1. Backup your instance. 2. Download fixed version from Atlassian downloads. 3. Stop Bitbucket. 4. Install update. 5. Restart Bitbucket. 6. Verify version.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allConfigure WAF to block open redirect patterns in URLs
User Awareness Training
allTrain users to verify URLs before entering credentials
🧯 If You Can't Patch
- Implement network segmentation to restrict Bitbucket access to trusted users only
- Deploy web security gateway to inspect and block malicious redirects
🔍 How to Verify
Check if Vulnerable:
Check Bitbucket version via admin interface or system info pageCheck Version:
Check via Bitbucket web interface: Admin → System → System InfoVerify Fix Applied:
Verify version is 8.9.13+ or 8.19.2+ and test redirect functionality📡 Detection & Monitoring
Log Indicators:
- Unusual redirect patterns in access logs
- Multiple failed login attempts followed by external redirects
Network Indicators:
- HTTP 302/301 redirects to external domains after login endpoints
SIEM Query:
source="bitbucket" AND (status=302 OR status=301) AND url="*redirect=*" AND NOT url="*atlassian.com*"