CVE-2023-45128
📋 TL;DR
This CVE describes a critical CSRF vulnerability in the Fiber web framework for Go that allows attackers to forge malicious requests on behalf of users. Attackers can inject arbitrary values without authentication or perform malicious actions as authenticated users, compromising application security. All users of vulnerable Fiber versions are affected.
💻 Affected Systems
- Fiber web framework
📦 What is this software?
Fiber by Gofiber
⚠️ Risk & Real-World Impact
Worst Case
Complete application compromise including data theft, account takeover, administrative actions performed by attackers, and potential lateral movement within the system.
Likely Case
Unauthorized actions performed on behalf of authenticated users, data manipulation, and potential account compromise.
If Mitigated
Limited impact with proper CSRF protections, though other vulnerabilities might still be exploitable through different vectors.
🎯 Exploit Status
CSRF attacks typically require minimal technical skill and can be performed with basic web knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.50.0
Vendor Advisory: https://github.com/gofiber/fiber/security/advisories/GHSA-94w9-97p3-p368
Restart Required: Yes
Instructions:
1. Update go.mod to require github.com/gofiber/fiber/v2 v2.50.0 or higher
2. Run 'go mod tidy' to update dependencies
3. Rebuild and redeploy your application
4. Restart all services using the Fiber framework
🧯 If You Can't Patch
- Implement additional CSRF protection middleware with proper token validation
- Add SameSite=Lax or SameSite=Secure attributes to session cookies with HttpOnly and Secure flags
🔍 How to Verify
Check if Vulnerable:
Check go.mod or go.sum for Fiber version. If version is below 2.50.0, the application is vulnerable.Check Version:
grep 'github.com/gofiber/fiber' go.modVerify Fix Applied:
Verify that go.mod requires github.com/gofiber/fiber/v2 v2.50.0 or higher and that the application builds successfully with this version.📡 Detection & Monitoring
Log Indicators:
- Unusual request patterns without CSRF tokens
- Requests with missing or invalid anti-CSRF headers
- Unexpected state changes from unverified sources
Network Indicators:
- Cross-origin requests to sensitive endpoints without proper referrer validation
- Requests lacking CSRF tokens in expected locations
SIEM Query:
web_requests WHERE (csrf_token IS NULL OR csrf_token = '') AND endpoint IN sensitive_endpoints🔗 References
- https://github.com/gofiber/fiber/commit/8c3916dbf4ad2ed427d02c6eb63ae8b2fa8f019a
- https://github.com/gofiber/fiber/security/advisories/GHSA-94w9-97p3-p368
- https://github.com/gofiber/fiber/commit/8c3916dbf4ad2ed427d02c6eb63ae8b2fa8f019a
- https://github.com/gofiber/fiber/security/advisories/GHSA-94w9-97p3-p368
