CVE-2023-5289
📋 TL;DR
This vulnerability in rdiffweb allows attackers to cause resource exhaustion through unlimited allocation without throttling, potentially leading to denial of service. It affects all users running rdiffweb versions prior to 2.8.4. The vulnerability stems from improper resource management in the web interface.
💻 Affected Systems
- rdiffweb
📦 What is this software?
Rdiffweb by Ikus Soft
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption through resource exhaustion, making rdiffweb unavailable for all users and potentially affecting underlying system stability.
Likely Case
Degraded performance or temporary service unavailability due to resource consumption attacks.
If Mitigated
Minimal impact with proper resource limits and monitoring in place.
🎯 Exploit Status
Exploitation requires network access to the rdiffweb interface but appears to be straightforward based on the CWE description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.8.4
Vendor Advisory: https://github.com/ikus060/rdiffweb/commit/06f89b43469aae70e8833e55192721523f86c5a2
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop rdiffweb service. 3. Update to version 2.8.4 using your package manager or from source. 4. Restart rdiffweb service. 5. Verify functionality.
🔧 Temporary Workarounds
Implement rate limiting
linuxConfigure web server or reverse proxy to limit request rates to rdiffweb endpoints
# Example for nginx: limit_req_zone $binary_remote_addr zone=rdiffweb:10m rate=10r/s;
# Add 'limit_req zone=rdiffweb burst=20 nodelay;' to location blocks
Resource monitoring and alerts
allSet up monitoring for resource consumption with automatic alerts
# Monitor process memory and CPU usage
ps aux | grep rdiffweb
# Set up monitoring with your preferred tool (Prometheus, Nagios, etc.)
🧯 If You Can't Patch
- Isolate rdiffweb instance behind strict network controls and limit access to trusted users only
- Implement aggressive resource limits at OS level and monitor for abnormal consumption patterns
🔍 How to Verify
Check if Vulnerable:
Check rdiffweb version: rdiffweb --version or examine package version. If version is below 2.8.4, system is vulnerable.Check Version:
rdiffweb --versionVerify Fix Applied:
Confirm version is 2.8.4 or higher and test resource-intensive operations to ensure proper throttling.📡 Detection & Monitoring
Log Indicators:
- Unusually high number of requests to specific endpoints
- Memory or CPU usage spikes in rdiffweb process logs
- Error messages related to resource exhaustion
Network Indicators:
- High volume of requests to rdiffweb from single or few sources
- Abnormal request patterns targeting resource-intensive operations
SIEM Query:
source="rdiffweb" AND (message="*memory*" OR message="*resource*" OR message="*throttle*") | stats count by src_ip