CVE-2023-22527 - Atlassian Confluence Remote Code Execution
Overview
CVE-2023-22527 is a critical remote code execution vulnerability in Atlassian Confluence Data Center and Server. This vulnerability allows unauthenticated attackers to execute arbitrary code on vulnerable Confluence instances through template injection in certain endpoints.
Quick Facts
- CVE ID: CVE-2023-22527
- CVSS Score: 10.0 (Critical)
- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CWE: CWE-94 (Improper Control of Generation of Code)
- Published: January 16, 2024
- Vendor: Atlassian
- Product: Confluence Data Center and Server
Affected Versions
Vulnerable Versions
- Confluence Data Center and Server: 8.0.x - 8.5.4
- Confluence Data Center and Server: 8.6.x - 8.7.1
- Confluence Data Center and Server: 8.8.x - 8.8.0
Fixed Versions
- 8.5.5 or later in the 8.5.x series
- 8.7.2 or later in the 8.7.x series
- 8.8.1 or later in the 8.8.x series
Vulnerability Description
This vulnerability exists in Confluence's template processing engine, specifically affecting certain endpoints that process template data without proper sanitization. The vulnerability allows attackers to inject malicious template code that gets executed on the server, leading to remote code execution.
Technical Details
The vulnerability is a Server-Side Template Injection (SSTI) that occurs when:
- User-controlled input is passed to template processing functions
- The template engine processes the input without proper sanitization
- Malicious template directives are executed on the server
The vulnerability affects specific endpoints in Confluence that handle template processing, particularly those related to:
- Template rendering functions
- Certain administrative endpoints
- Content processing functions
Attack Vectors
Primary Attack Vector
- Network-based: Remote unauthenticated exploitation via HTTP/HTTPS
- Attack Complexity: Low - No special conditions required
- Privileges Required: None - Unauthenticated access
- User Interaction: None required
Attack Chain
- Attacker identifies vulnerable Confluence instance
- Crafts malicious template injection payload
- Sends payload to vulnerable endpoint
- Template engine processes malicious code
- Remote code execution achieved on server
Impact Assessment
Potential Impact
- Complete system compromise
- Data exfiltration of sensitive information
- Lateral movement within network infrastructure
- Denial of service attacks
- Installation of persistent backdoors
- Privilege escalation to system-level access
Business Impact
- Critical: Complete compromise of Confluence infrastructure
- Data Breach: Access to all stored content and user data
- Operational Disruption: Potential for complete service interruption
- Compliance Violations: Potential regulatory implications
Exploitation Timeline
- 2023-12: Vulnerability discovered
- 2024-01-16: CVE published and patches released
- 2024-01-17: Public exploitation attempts observed
- 2024-01-18: Mass scanning campaigns detected
- 2024-01-20: Active exploitation in the wild confirmed
Detection and Indicators
Network Indicators
- Unusual HTTP requests to Confluence endpoints
- Template injection patterns in request parameters
- Abnormal response times from Confluence server
- Unexpected outbound network connections
System Indicators
- Unusual processes running under Confluence service account
- Unexpected file system changes
- New network listeners on unusual ports
- Suspicious command execution logs
Log Patterns to Monitor
- Template processing errors
- Unusual parameter patterns
- Failed authentication followed by successful code execution
- Unexpected administrative actions
- Patch immediately to fixed versions
- Network isolation of vulnerable instances
- Monitor for exploitation attempts
- Review access logs for suspicious activity
Long-term Security Measures
- Regular security updates
- Network segmentation
- Web Application Firewall (WAF) deployment
- Security monitoring and logging
- Regular security assessments
Emergency Response
If exploitation is suspected:
- Isolate affected systems immediately
- Preserve logs and evidence
- Assess scope of compromise
- Implement incident response procedures
- Notify stakeholders as appropriate
Prevention Strategies
Technical Controls
- Input validation and sanitization
- Template sandboxing and restrictions
- Principle of least privilege
- Network access controls
- Regular vulnerability scanning
Administrative Controls
- Patch management processes
- Security awareness training
- Incident response planning
- Regular security assessments
- Change management procedures
References and Resources
Official Sources
Security Research
- Vulnerability scanners updates
- YARA rules for detection
- IDS/IPS signatures
Disclaimer
This repository is intended for educational and defensive purposes only. The information provided here should be used to:
- Understand the vulnerability for better defense
- Implement proper mitigations and controls
- Develop detection capabilities
- Educate security teams about the threat
This information should not be used for:
- Unauthorized testing or exploitation
- Malicious activities
- Attacking systems you do not own or have permission to test
Contributing
Contributions to improve the documentation, add detection rules, or enhance mitigation strategies are welcome. Please ensure all contributions focus on defensive measures and responsible disclosure principles.
Repository Structure
This repository contains comprehensive documentation and resources for CVE-2023-22527:
📚 Documentation Files
🎯 Quick Navigation
thompson005/cve-2023-22527
