CVE-2023-22503 Overview
CVE-2023-22503 is an information disclosure vulnerability affecting Atlassian Confluence Server and Data Center. The vulnerability allows anonymous remote attackers to view the names of attachments and labels in private Confluence spaces through the macro preview feature. This security flaw bypasses the intended access controls designed to protect confidential workspace content.
Critical Impact
Anonymous attackers can enumerate sensitive attachment names and labels from private Confluence spaces, potentially exposing confidential document titles, project names, and organizational information without authentication.
Affected Products
- Atlassian Confluence Server versions before 7.13.15
- Atlassian Confluence Server and Data Center versions from 7.14.0 before 7.19.7
- Atlassian Confluence Server and Data Center versions from 7.20.0 before 8.2.0
Discovery Timeline
- Discovered - Vulnerability reported by Rojan Rijal of the Tinder Security Engineering team
- 2023-05-01 - CVE-2023-22503 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2023-22503
Vulnerability Analysis
This information disclosure vulnerability (CWE-200) exists within the macro preview feature of Atlassian Confluence Server and Data Center. The flaw stems from insufficient access control validation when rendering macro previews, allowing unauthenticated users to retrieve metadata about attachments and labels that should be restricted to authorized users of private spaces.
The vulnerability is particularly concerning for organizations that rely on Confluence's space-level permissions to protect sensitive documentation. Attachment names often contain descriptive information about their contents, and labels are frequently used to categorize and organize confidential materials. Exposure of this metadata could reveal project codenames, client names, internal initiatives, or other sensitive organizational information.
Root Cause
The root cause of CVE-2023-22503 lies in improper access control implementation within the macro preview functionality. When a macro preview request is processed, the system fails to properly validate whether the requesting user has the necessary permissions to view content from the target Confluence space. This authorization bypass allows anonymous users to access metadata that should only be visible to space members.
Attack Vector
The attack vector for this vulnerability is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted requests to the macro preview endpoint of a vulnerable Confluence instance. The attack does not require any privileges, making it accessible to any network-connected adversary who can reach the Confluence server.
The exploitation process involves targeting the macro preview feature to enumerate attachment names and labels from private spaces. While the actual file contents are not exposed, the metadata disclosure can provide valuable reconnaissance information for further attacks or reveal sensitive organizational data directly through descriptive naming conventions.
Detection Methods for CVE-2023-22503
Indicators of Compromise
- Unusual or high-volume requests to macro preview endpoints from unauthenticated sessions
- Access log entries showing macro preview requests targeting multiple private spaces from single IP addresses
- Anonymous requests attempting to enumerate attachment or label metadata across various Confluence spaces
- Suspicious patterns of sequential space ID enumeration in server logs
Detection Strategies
- Monitor Confluence access logs for anonymous requests to macro preview functionality
- Implement web application firewall rules to detect and alert on enumeration patterns
- Configure intrusion detection systems to flag high-frequency requests to Confluence preview endpoints
- Review audit logs for unauthorized access attempts to private space resources
Monitoring Recommendations
- Enable detailed access logging for Confluence Server and Data Center instances
- Implement real-time alerting for unusual anonymous request patterns
- Monitor for scanning activity targeting Confluence instances from external IP addresses
- Regularly review access logs for signs of information gathering or reconnaissance activity
How to Mitigate CVE-2023-22503
Immediate Actions Required
- Upgrade Atlassian Confluence Server to version 7.13.15 or later for the 7.13.x branch
- Upgrade to version 7.19.7 or later for installations on versions 7.14.0 through 7.19.6
- Upgrade to version 8.2.0 or later for installations on versions 7.20.0 through 8.1.x
- Review access logs to determine if the vulnerability has been exploited prior to patching
Patch Information
Atlassian has released security updates to address this vulnerability. Organizations should consult the Atlassian Jira Issue CONFSERVER-82403 for detailed patch information and upgrade instructions. The fixed versions are:
- Version 7.13.15 and later (for 7.13.x branch)
- Version 7.19.7 and later (for 7.14.x through 7.19.x branch)
- Version 8.2.0 and later (for 7.20.x through 8.x branch)
Workarounds
- Restrict network access to Confluence instances using firewall rules until patches can be applied
- Implement reverse proxy authentication to prevent anonymous access to Confluence endpoints
- Consider temporarily disabling macro preview functionality if business operations permit
- Monitor and audit all anonymous access attempts while awaiting patch deployment
# Example: Restrict anonymous access via reverse proxy configuration
# Add authentication requirement for macro preview endpoints
# Consult Atlassian documentation for specific configuration guidance
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
