CVE-2022-22979
📋 TL;DR
A caching vulnerability in Spring Cloud Function's Function Catalog component allows attackers to cause denial-of-service conditions by exploiting lookup functionality. This affects applications using Spring Cloud Function versions before 3.2.6 that expose framework lookup features to users. The vulnerability enables resource exhaustion attacks against affected systems.
💻 Affected Systems
- Spring Cloud Function
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to resource exhaustion, potentially affecting downstream dependent services and causing extended downtime.
Likely Case
Degraded application performance or temporary service interruptions affecting specific functions or endpoints.
If Mitigated
Minimal impact with proper rate limiting, resource monitoring, and access controls in place.
🎯 Exploit Status
Exploitation requires direct interaction with framework lookup functionality. Attack vectors may include specially crafted HTTP requests or function invocations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.6 or later
Vendor Advisory: https://tanzu.vmware.com/security/cve-2022-22979
Restart Required: Yes
Instructions:
1. Update Spring Cloud Function dependency to version 3.2.6 or later. 2. Update pom.xml or build.gradle with new version. 3. Rebuild and redeploy application. 4. Restart affected services.
🔧 Temporary Workarounds
Disable or restrict lookup functionality
allRemove or restrict access to framework lookup endpoints if not required for application functionality.
Implement rate limiting
allAdd rate limiting to function lookup endpoints to prevent resource exhaustion attacks.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all function lookup requests
- Deploy Web Application Firewall (WAF) with DoS protection rules
🔍 How to Verify
Check if Vulnerable:
Check Spring Cloud Function version in pom.xml, build.gradle, or application dependencies. Verify if version is below 3.2.6.Check Version:
grep -i 'spring-cloud-function' pom.xml || grep -i 'spring-cloud-function' build.gradle || mvn dependency:tree | grep spring-cloud-functionVerify Fix Applied:
Confirm Spring Cloud Function version is 3.2.6 or higher in dependencies and verify application restart completed successfully.📡 Detection & Monitoring
Log Indicators:
- Unusual frequency of function lookup requests
- Increased memory or CPU usage patterns
- Error logs related to function catalog or caching
Network Indicators:
- High volume of requests to function lookup endpoints
- Abnormal request patterns to Spring Cloud Function endpoints
SIEM Query:
source="application.logs" AND ("function lookup" OR "FunctionCatalog") AND (frequency > 1000 per minute)