CVE-2024-36471
📋 TL;DR
This CVE describes a DNS rebinding vulnerability in Apache Allura's import functionality. Attackers can trick project administrators into importing malicious URLs that resolve to internal services after verification, potentially exposing internal network resources. This affects Apache Allura versions 1.0.1 through 1.16.0.
💻 Affected Systems
- Apache Allura
📦 What is this software?
Allura by Apache
⚠️ Risk & Real-World Impact
Worst Case
Project administrators could be tricked into importing URLs that resolve to internal services, allowing attackers to read sensitive data from internal systems like databases, file servers, or management interfaces.
Likely Case
Attackers could access internal services that shouldn't be exposed externally, potentially leaking configuration data, credentials, or other sensitive information from internal systems.
If Mitigated
With proper network segmentation and access controls, the impact would be limited to services already accessible from the Allura server's network position.
🎯 Exploit Status
Requires social engineering to trick project administrators into importing malicious URLs. DNS rebinding attacks require specific timing and network conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.17.0
Vendor Advisory: https://lists.apache.org/thread/g43164t4bcp0tjwt4opxyks4svm8kvbh
Restart Required: Yes
Instructions:
1. Backup your Allura installation and data. 2. Download Apache Allura 1.17.0 from official sources. 3. Stop Allura services. 4. Replace existing installation with 1.17.0. 5. Restart Allura services. 6. Verify functionality.
🔧 Temporary Workarounds
Disable vulnerable importers
allDisable the forge-tracker and forge-discussion importers that are vulnerable to DNS rebinding attacks
Add 'disable_entry_points.allura.importers = forge-tracker, forge-discussion' to your Allura .ini configuration file
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Allura servers from sensitive internal services
- Educate project administrators about the risks of importing untrusted URLs and implement approval workflows for imports
🔍 How to Verify
Check if Vulnerable:
Check your Allura version. If it's between 1.0.1 and 1.16.0 inclusive, you are vulnerable.Check Version:
Check Allura configuration files or web interface for version information, or run 'pip show allura' if installed via pipVerify Fix Applied:
After upgrading to 1.17.0, verify the version shows 1.17.0 or higher. Test import functionality with controlled test cases.📡 Detection & Monitoring
Log Indicators:
- Unusual import activity from project administrators
- Import requests to unusual or internal IP addresses
- Failed import attempts with suspicious URLs
Network Indicators:
- DNS queries for unusual domains followed by HTTP requests to internal IPs
- Outbound connections from Allura server to internal services it shouldn't access
SIEM Query:
source="allura-logs" AND (event="import" OR event="url_fetch") AND (url CONTAINS "internal" OR dest_ip IN [RFC1918_RANGES])