CVE-2024-27282
📋 TL;DR
This vulnerability in Ruby's regex compiler allows attackers to read arbitrary heap memory when processing malicious regex patterns. This can leak sensitive data like passwords, keys, and pointers. All Ruby 3.x applications processing untrusted regex input are affected.
💻 Affected Systems
- Ruby
- Ruby on Rails
- Any application using Ruby
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete memory disclosure leading to credential theft, privilege escalation, or remote code execution via leaked pointers
Likely Case
Information disclosure of sensitive strings and memory addresses from the Ruby process
If Mitigated
Limited impact if regex inputs are sanitized and memory protections are in place
🎯 Exploit Status
Proof of concept available on HackerOne. Exploitation requires ability to supply regex patterns to vulnerable Ruby code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Ruby 3.0.7, 3.1.5, 3.2.4, 3.3.1
Vendor Advisory: https://www.ruby-lang.org/en/news/2024/04/23/arbitrary-memory-address-read-regexp-cve-2024-27282/
Restart Required: Yes
Instructions:
1. Identify Ruby version with 'ruby -v'. 2. Update using package manager: 'apt update && apt upgrade ruby' (Debian/Ubuntu) or 'yum update ruby' (RHEL/CentOS). 3. For Ruby version managers: 'rvm install ruby-3.3.1' or 'rbenv install 3.3.1'. 4. Restart all Ruby applications and services.
🔧 Temporary Workarounds
Input Validation for Regex Patterns
allValidate and sanitize all regex pattern inputs to prevent malicious patterns
Process Isolation
linuxRun Ruby applications in containers or VMs with limited memory access
docker run --memory=512m your-ruby-app
🧯 If You Can't Patch
- Implement strict input validation for all regex pattern inputs
- Isolate Ruby applications in containers with memory limits and minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check Ruby version with 'ruby -v'. If version is between 3.0.0 and 3.3.0 (excluding patched versions), system is vulnerable.Check Version:
ruby -vVerify Fix Applied:
Run 'ruby -v' and confirm version is 3.0.7, 3.1.5, 3.2.4, or 3.3.1 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusual regex compilation errors
- Memory access violations in Ruby logs
- Abnormal process memory usage
Network Indicators:
- Requests with complex regex patterns in parameters
- Unusual data exfiltration from Ruby processes
SIEM Query:
source="ruby.log" AND ("regex compilation" OR "memory access") AND severity=ERROR🔗 References
- https://hackerone.com/reports/2122624
- https://www.ruby-lang.org/en/news/2024/04/23/arbitrary-memory-address-read-regexp-cve-2024-27282/
- https://hackerone.com/reports/2122624
- https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/27LUWREIFTP3MQAW7QE4PJM4DPAQJWXF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XYDHPHEZI7OQXTQKTDZHGZNPIJH7ZV5N/
- https://security.netapp.com/advisory/ntap-20241011-0007/
- https://www.ruby-lang.org/en/news/2024/04/23/arbitrary-memory-address-read-regexp-cve-2024-27282/
