CVE-2023-41877
📋 TL;DR
This CVE describes a path traversal vulnerability in GeoServer that allows administrators with access to the admin console to misconfigure log file locations to arbitrary paths, then view the contents of those files through the GeoServer Logs page. It affects GeoServer versions 2.23.4 and prior. The vulnerability requires administrative access, so it primarily impacts organizations where GeoServer administrators could be compromised or malicious.
💻 Affected Systems
- GeoServer
📦 What is this software?
Geoserver by Geoserver
⚠️ Risk & Real-World Impact
Worst Case
A compromised or malicious administrator could read sensitive system files (including configuration files, credentials, or other sensitive data) from the server filesystem, potentially leading to full system compromise.
Likely Case
An administrator with legitimate access could accidentally or intentionally read files they shouldn't have access to, violating data confidentiality policies.
If Mitigated
With proper access controls and monitoring, the impact is limited to authorized administrators who are already trusted with significant system access.
🎯 Exploit Status
Exploitation requires administrative access to GeoServer, which typically represents a trusted party. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available as of publication
Vendor Advisory: https://github.com/geoserver/geoserver/security/advisories/GHSA-8g7v-vjrc-x4g5
Restart Required: No
Instructions:
No official patch is available. Apply workarounds or upgrade to a future version when a fix is released.
🔧 Temporary Workarounds
Set GEOSERVER_LOG_LOCATION via system property
allOverride the log location configuration using system properties to prevent administrators from changing it via the web interface.
java -DGEOSERVER_LOG_LOCATION=/secure/path/geoserver.log -jar geoserver.war
Set GEOSERVER_LOG_LOCATION via environment variable
linuxSet the log location as an environment variable to override web interface configuration.
export GEOSERVER_LOG_LOCATION=/secure/path/geoserver.log
Set GEOSERVER_LOG_LOCATION via servlet context
allConfigure the log location in the servlet context parameters of your application server.
🧯 If You Can't Patch
- Restrict administrative access to GeoServer to only trusted personnel with minimal necessary privileges.
- Implement file system permissions to limit what files GeoServer and its administrators can access.
🔍 How to Verify
Check if Vulnerable:
Check GeoServer version: if version is 2.23.4 or earlier, the system is vulnerable. Verify if administrators can modify log file location in Global Settings.Check Version:
Check the GeoServer version in the admin console under About & Status, or examine the geoserver.log file for version information.Verify Fix Applied:
Verify that GEOSERVER_LOG_LOCATION is set via system property, environment variable, or servlet context parameter and cannot be overridden via the admin console.📡 Detection & Monitoring
Log Indicators:
- Unusual log file path configurations in GeoServer logs
- Administrative actions modifying Global Settings log location
Network Indicators:
- HTTP requests to /geoserver/web/admin/globalSettings with log location parameters
SIEM Query:
source="geoserver.log" AND ("log.location" OR "Global Settings" AND "log")🔗 References
- https://docs.geoserver.org/latest/en/user/configuration/globalsettings.html#log-location
- https://github.com/geoserver/geoserver/security/advisories/GHSA-8g7v-vjrc-x4g5
- https://docs.geoserver.org/latest/en/user/configuration/globalsettings.html#log-location
- https://github.com/geoserver/geoserver/security/advisories/GHSA-8g7v-vjrc-x4g5
