Quick Summary
Apache Tomcat Manager Interface Exposed is a security misconfiguration where the Tomcat Manager web application is accessible without proper access control or is exposed to untrusted networks. This may allow attackers to deploy malicious WAR files, execute arbitrary code, or gain full control over the application server.
Vulnerability Classification
| Field | Value |
|---|---|
| Vulnerability Type | Insecure Application Management Interface |
| CWE ID | CWE-284 – Improper Access Control |
| CVE ID | N/A (Configuration Issue) |
| CVSS 4.0 Base Score | 9.4 (Critical) |
| CVSS Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H |
| OWASP Category | A05:2021 – Security Misconfiguration |
| Attack Surface | External / Internal Network |
Affected Asset / Environment
- Service: Apache Tomcat
- Common Ports: 8080, 8443
- Exposed Paths: /manager/html, /manager/text
- Platforms: Linux / Windows Servers
- Testing Method: Black-box / External Assessment
- Tools Used: Nmap, curl, Browser Access
Description
The assessor observed that the Apache Tomcat Manager interface is accessible on the target server. The Manager application is intended for administrative purposes, allowing deployment, undeployment, and management of web applications.
When exposed without proper authentication controls or restricted IP access, attackers may attempt brute-force attacks against default credentials or exploit misconfigured permissions.
If successful, attackers can upload malicious WAR files and execute arbitrary code on the server, leading to complete compromise of the application environment.
Root Cause
The issue occurs due to improper Tomcat configuration where the Manager application is exposed to untrusted networks.
Common root causes include:
- Default Tomcat installation not hardened
- Manager interface not restricted by IP
- Weak or default credentials configured
- Missing authentication enforcement
- Lack of firewall restrictions
Business Impact
Exploitation of this vulnerability may allow attackers to deploy malicious applications, access sensitive data, or execute system-level commands.
Compromise of the application server may impact hosted web applications, leading to data breaches, service disruption, and reputational damage.
In production environments, unauthorized deployment through Tomcat Manager may result in supply chain compromise or persistent backdoor installation.
Technical Impact
An attacker can:
- Access Tomcat Manager interface
- Enumerate deployed applications
- Upload malicious WAR files
- Execute arbitrary commands
- Obtain reverse shell access
- Pivot to other internal systems
This represents a critical remote code execution risk if authentication controls are weak or misconfigured.
Proof of Concept (PoC)
Step1: Identify Tomcat Service
nmap -sV -p 8080,8443 <target-ip>
If service is identified as Apache Tomcat, proceed to interface validation.
Step2: Check Manager Interface Accessibility
curl http://<target-ip>:8080/manager/html
If HTTP response returns login page or manager content without IP restriction, interface is exposed.
Step3: Attempt Text Interface Access
curl http://<target-ip>:8080/manager/text/list
If application listing is returned or authentication challenge appears, exposure is confirmed.
Step4: Test Default Credentials (Authorized Testing Only)
Attempt login using common defaults:
- tomcat:tomcat
- admin:admin
If authentication succeeds, server is critically exposed.
Step5: Validate Deployment Capability (Authorized Testing Only)
curl -u admin:password -T shell.war "http://<target-ip>:8080/manager/text/deploy?path=/shell"
If deployment succeeds, remote code execution is possible.
Exploitation Prerequisites
- Network access to Tomcat service port
- Manager interface enabled
- Weak or default credentials
- No IP-based restriction
Remediation
It is recommended that the Tomcat Manager interface not be exposed to public networks.
Recommended actions:
- Restrict access to trusted IP addresses only
- Enforce strong authentication
- Remove or disable Manager application if not required
- Implement firewall restrictions
- Use HTTPS with proper TLS configuration
- Regularly audit Tomcat configurations
After applying changes, verify that unauthorized access is denied.
Detection and Monitoring
- Monitor Tomcat access logs
- Alert on repeated login attempts
- Restrict access to management endpoints
- Conduct periodic security assessments