mongo-express Remote Code Execution (RCE) Vulnerability Analysis via vm Module Misuse (CVE-2019-10758)
Executive & SecOps Summary
SECOPS ASSESSMENTAll Node.js database management environments running mongo-express versions prior to 0.54.0
Authenticated attackers can bypass the sandbox and execute arbitrary system commands on the host OS via endpoints utilizing the toBSON method
Immediately upgrade the mongo-express package to version 0.54.0 or higher, restrict external access, and enforce strong authentication
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The primary remediation is to upgrade mongo-express to version 0.54.0 or later. Run the following commands to update your project dependencies:
# For npm users
npm install mongo-express@0.54.0 --save
# For yarn users
yarn upgrade mongo-express@0.54.0
# For Docker environments, pull the patched image
docker pull mongo-express:0.54.02. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict access to the mongo-express web console. Use an Nginx reverse proxy to limit access to trusted IP ranges only.
# /etc/nginx/conf.d/mongo-express.conf
server {
listen 80;
server_name mongo-express.local;
location / {
# Allow only trusted internal administrator IP ranges
allow 10.0.0.0/8;
allow 192.168.1.0/24;
deny all;
proxy_pass http://127.0.0.1:8081;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
}
}3. Log Audit & IoC Verification Commands
Verify the currently running version of mongo-express and inspect web server logs for potential exploitation attempts targeting the toBSON method.
# 1. Check the installed mongo-express version
npm list mongo-express
# 2. Check the running container image version
docker ps --filter 'ancestor=mongo-express' --format '{{.ID}} {{.Image}}'
# 3. Scan access logs for sandbox escape and child_process execution payloads
grep -Ei 'toBSON|constructor|process|exec|child_process' /var/log/nginx/access.logScan Your Repositories for Transitive Vulnerable Dependencies in 30 Seconds
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This is a critical Remote Code Execution (RCE) vulnerability in mongo-express, a web-based administrative interface for MongoDB. The root cause lies in the insecure misuse of the Node.js native vm module when processing user-supplied input. mongo-express utilizes the toBSON method internally to convert string inputs into BSON objects. Due to a lack of input validation, executing dynamic code via APIs like vm.runInNewContext allows attackers to escape the sandbox environment and execute malicious JavaScript code within the context of the host process.
2. Exploitation Mechanics & Attack Scenario
An authenticated attacker (often leveraging default credentials like admin:pass if left unchanged) sends a malicious HTTP POST request to specific API endpoints (e.g., /db/<database>/collections/<collection>) that trigger the toBSON method. The request payload contains a prototype chain escape sequence such as this.constructor.constructor('return process')(). This bypasses the vm sandbox, gains access to the host's process object, and invokes the exec function of the child_process module to execute arbitrary OS commands on the target server. This vulnerability has public PoCs and is actively exploited in the wild, leading to its inclusion in the CISA KEV catalog.
3. Infrastructure & Business Impact
With a CVSS 3.1 score of 9.9, this vulnerability poses a critical threat. Successful exploitation grants the attacker full control over the container or host server running the mongo-express process. This can lead to unauthorized access, exfiltration, or destruction of sensitive data stored in the MongoDB database, and allows attackers to establish a foothold for lateral movement within the internal network.
Official Vendor Advisories & References
mongo-express before 0.54.0 is vulnerable to Remote Code Execution via endpoints that uses the `toBSON` method. A misuse of the `vm` dependency to perform `exec` commands in a non-safe environment.
Frequently Asked SecOps Questions (CVE-2019-10758)
FAQQ1. How critical is CVE-2019-10758 and is it actively exploited in the wild?
CVE-2019-10758 is rated CVSS 9.9 (CRITICAL) with a 30-day EPSS exploitation probability of 84.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-10758?
Primary impacted vendors include mongo-express across mongo-express. Scope summary: All versions of mongo-express prior to 0.54.0 (Web console application running on Node.js)
Q3. What temporary mitigations or workarounds exist for CVE-2019-10758 before patching?
[Mitigation] Immediately upgrade the mongo-express package to version 0.54.0 or higher, restrict external access, and enforce strong authentication Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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