CVE-2023-22799
📋 TL;DR
This CVE describes a Regular Expression Denial of Service (ReDoS) vulnerability in GlobalID versions before 1.0.1. An attacker can cause excessive CPU consumption and service degradation by providing specially crafted input to vulnerable regular expressions. All applications using affected GlobalID versions are potentially vulnerable.
💻 Affected Systems
- GlobalID (Ruby gem)
📦 What is this software?
Globalid by Rubyonrails
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to CPU exhaustion, leading to denial of service for legitimate users.
Likely Case
Performance degradation and intermittent service disruption affecting application responsiveness.
If Mitigated
Minimal impact with proper rate limiting, input validation, and monitoring in place.
🎯 Exploit Status
ReDoS attacks are well-understood and easy to craft. No authentication required to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1
Vendor Advisory: https://discuss.rubyonrails.org/t/cve-2023-22799-possible-redos-based-dos-vulnerability-in-globalid/82127
Restart Required: Yes
Instructions:
1. Update Gemfile to specify 'gem "globalid", ">= 1.0.1"'. 2. Run 'bundle update globalid'. 3. Restart your application server.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation to reject malformed GlobalID strings before processing.
Rate limiting
allImplement rate limiting on endpoints that accept GlobalID parameters to limit attack impact.
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block suspicious patterns in GlobalID parameters
- Deploy additional monitoring for CPU spikes and implement automated alerting
🔍 How to Verify
Check if Vulnerable:
Check Gemfile.lock or run 'bundle show globalid' to see installed version. If version is < 1.0.1, you are vulnerable.Check Version:
bundle show globalidVerify Fix Applied:
After updating, verify 'bundle show globalid' returns version 1.0.1 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusually long processing times for requests containing GlobalID parameters
- CPU spikes correlated with specific request patterns
Network Indicators:
- Repeated requests with similar but varying GlobalID parameters
- Abnormal request patterns targeting endpoints using GlobalID
SIEM Query:
source=application_logs AND (message="*GlobalID*" OR message="*processing_time*" > 10s)