CVE-2023-40180
📋 TL;DR
This vulnerability in silverstripe-graphql allows attackers to execute recursive GraphQL queries causing Distributed Denial of Service (DDoS) attacks. Websites with publicly exposed GraphQL schemas are most vulnerable, while sites requiring authentication are still at risk from authenticated users. The attack exploits uncontrolled resource consumption through complex query recursion.
💻 Affected Systems
- silverstripe-graphql
📦 What is this software?
Graphql by Silverstripe
Graphql by Silverstripe
Graphql by Silverstripe
Graphql by Silverstripe
Graphql by Silverstripe
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability through resource exhaustion, potentially affecting all users and causing extended downtime.
Likely Case
Degraded performance or intermittent service disruptions from resource-intensive recursive queries.
If Mitigated
Minimal impact with proper CDN protection, authentication requirements, and query complexity limits.
🎯 Exploit Status
Exploitation requires crafting recursive GraphQL queries, which is straightforward for attackers familiar with GraphQL.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.8.2, 4.1.3, 4.2.5, 4.3.4, or 5.0.3 depending on your version
Vendor Advisory: https://www.silverstripe.org/download/security-releases/CVE-2023-40180
Restart Required: Yes
Instructions:
1. Identify your silverstripe-graphql version. 2. Update to the patched version matching your major release (3.x, 4.x, or 5.x). 3. Restart your web server/application. 4. Verify the update was successful.
🔧 Temporary Workarounds
Implement GraphQL Query Complexity Limits
allAdd query complexity analysis and limits to prevent resource-intensive recursive queries
Refer to Silverstripe GraphQL security documentation for implementation details
Restrict GraphQL Endpoint Access
allLimit GraphQL endpoint to authenticated users only or specific IP ranges
Configure web server/application firewall rules to restrict access
🧯 If You Can't Patch
- Implement WAF/CDN protection with rate limiting and query analysis
- Disable public GraphQL endpoints and require authentication for all GraphQL access
🔍 How to Verify
Check if Vulnerable:
Check your composer.json or installed packages for silverstripe/graphql versionCheck Version:
composer show silverstripe/graphql | grep versionsVerify Fix Applied:
Verify the installed version is 3.8.2+, 4.1.3+, 4.2.5+, 4.3.4+, or 5.0.3+📡 Detection & Monitoring
Log Indicators:
- Unusually large GraphQL query payloads
- Recursive query patterns in GraphQL logs
- Spike in server resource usage (CPU/memory) from GraphQL endpoints
Network Indicators:
- High volume of GraphQL requests to single endpoint
- Large POST requests to GraphQL endpoints
SIEM Query:
source="web_server_logs" AND uri="/graphql" AND (size_bytes>10000 OR duration_ms>5000)🔗 References
- https://docs.silverstripe.org/en/developer_guides/graphql/security_and_best_practices/recursive_or_complex_queries
- https://github.com/silverstripe/silverstripe-graphql/commit/f6d5976ec4608e51184b0db1ee5b9e9a99d2501c
- https://github.com/silverstripe/silverstripe-graphql/security/advisories/GHSA-v23w-pppm-jh66
- https://github.com/silverstripe/silverstripe-graphql/tree/3.8#recursive-or-complex-queries
- https://www.silverstripe.org/download/security-releases/CVE-2023-40180
- https://docs.silverstripe.org/en/developer_guides/graphql/security_and_best_practices/recursive_or_complex_queries
- https://github.com/silverstripe/silverstripe-graphql/commit/f6d5976ec4608e51184b0db1ee5b9e9a99d2501c
- https://github.com/silverstripe/silverstripe-graphql/security/advisories/GHSA-v23w-pppm-jh66
- https://github.com/silverstripe/silverstripe-graphql/tree/3.8#recursive-or-complex-queries
- https://www.silverstripe.org/download/security-releases/CVE-2023-40180
