Sonatype Nexus Repository Manager 3 Missing Access Control and Remote Code Execution (RCE) Vulnerability (CVE-2019-7238) Analysis & Remediation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTSonatype Nexus Repository Manager versions prior to 3.15.0
Unauthenticated remote attackers can execute arbitrary Groovy scripts and gain full system-level control by sending specially crafted HTTP POST requests
Immediately upgrade to the latest stable version (3.15.0 or higher) or restrict external access to the vulnerable endpoints
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The recommended remediation is to upgrade Nexus Repository Manager to version 3.15.0 or later. Below is an example of upgrading a Docker-based deployment.
# 1. Stop and remove the existing vulnerable Nexus container
docker stop nexus-server
docker rm nexus-server
# 2. Pull and run the secure Nexus 3 version (ensure data volume is preserved)
docker run -d -p 8081:8081 --name nexus-server -v /some/dir/nexus-data:/nexus-data sonatype/nexus3:3.15.02. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, use a reverse proxy (e.g., Nginx) to block or restrict access to the vulnerable /service/extdirect endpoint.
# Nginx Reverse Proxy Hardening Example
server {
listen 80;
server_name nexus.internal.local;
location /service/extdirect {
# Restrict access to trusted internal IP ranges only
allow 10.0.0.0/8;
allow 192.168.0.0/16;
deny all;
proxy_pass http://localhost:8081/service/extdirect;
}
location / {
proxy_pass http://localhost:8081;
}
}3. Log Audit & IoC Verification Commands
Search the Nexus request logs (request.log) for anomalous POST requests targeting the /service/extdirect endpoint.
# Search for POST requests targeting the vulnerable endpoint in Nexus logs
grep -i 'POST' /opt/sonatype/sonatype-work/nexus3/log/request.log | grep '/service/extdirect'
# Check for suspicious child processes spawned by the nexus user
ps -ef | grep nexus | grep -E '(sh|bash|curl|wget|python)'Scan Your Repositories for Transitive Vulnerable Dependencies in 30 Seconds
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2019-7238) exists in Sonatype Nexus Repository Manager 3 due to insufficient access control on specific internal API endpoints. Specifically, certain API endpoints designed for internal administration and search operations are exposed to unauthenticated anonymous users, allowing them to pass input directly to the underlying Groovy script engine without proper validation.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated attacker can send a specially crafted JSON-RPC POST request to the /service/extdirect endpoint. By invoking internal API methods such as corehelper within the extdirect component, the attacker can inject and execute arbitrary Groovy scripts within the server's context. This follows a classic Java script engine abuse pattern, enabling direct operating system command execution.
3. Infrastructure & Business Impact
Nexus Repository Manager is a critical piece of DevSecOps infrastructure hosting proprietary source code and software artifacts. Successful exploitation allows attackers to steal intellectual property or inject malicious code into software packages (Supply Chain Attack). Given its inclusion in the CISA KEV catalog, this vulnerability has been actively exploited in the wild and poses an extreme risk.
Official Vendor Advisories & References
Sonatype Nexus Repository Manager before 3.15.0 has Incorrect Access Control.
Frequently Asked SecOps Questions (CVE-2019-7238)
FAQQ1. How critical is CVE-2019-7238 and is it actively exploited in the wild?
CVE-2019-7238 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 76.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-7238?
Primary impacted vendors include sonatype across nexus repository manager. Scope summary: All Sonatype Nexus Repository Manager 3.x versions prior to 3.15.0
Q3. What temporary mitigations or workarounds exist for CVE-2019-7238 before patching?
[Mitigation] Immediately upgrade to the latest stable version (3.15.0 or higher) or restrict external access to the vulnerable endpoints Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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