T09 · Insecure Skill Coding Practices
- Location
simple-search.js:6- Finding
Chromium Browser Sandbox Explicitly Disabled
- Content
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Vulnerability Details
File Location:
simple-search.js, lines 6–9
Vulnerability Type: Browser process isolation disabled
Risk Level: MediumVulnerable Code
js const browser = await puppeteer.launch({ headless: true, args: ['--no-sandbox', '--disable-setuid-sandbox'] });Technical Analysis
The Puppeteer launch configuration passes both
--no-sandboxand--disable-setuid-sandboxto Chromium. These options disable Chromium's process sandbox and setuid sandbox, removing important isolation boundaries between browser-rendered content and the host operating system.The script subsequently navigates this unsandboxed browser to Noon:
js await page.goto(url, { waitUntil: 'networkidle2', timeout: 30000 });The browser therefore processes content supplied by Noon and any third-party resources loaded by that site without Chromium's normal sandbox protections. Disabling the sandbox does not independently provide remote code execution, but it can substantially increase the impact of a browser vulnerability by eliminating an isolation layer that an attacker would otherwise need to escape.
Successful exploitation requires malicious or compromised web content and a compatible Chromium renderer or browser-process vulnerability.
Attack Path
- A user executes
simple-search.js. - The script launches Chromium with both sandbox mechanisms disabled.
- Chromium visits Noon and loads first-party and potentially third-party web resources.
- An attacker compromises an upstream resource, controls content returned to the browser, or otherwise causes the browser to process a malicious payload.
- The malicious content exploits a vulnerability in the installed Chromium version.
- Because browser sandboxing is disabled, successful exploitation may execute code with the privileges of the account running the Skill rather than remaining confined to a restricted renderer sandbox.
Impact Assessment
An attacker who successfully ...[truncated 822 chars]
- A user executes
- Remediation
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Remediation Suggestions
Remove the sandbox-disabling command-line arguments and launch Chromium with its default security boundaries:
js const browser = await puppeteer.launch({ headless: true });Apply the following additional hardening measures:
- Run the Skill as a dedicated, unprivileged operating-system user.
- Never run the browser or Skill as root.
- Ensure the host supports Chromium's user-namespace or setuid sandbox configuration.
- Keep Chromium and Puppeteer dependencies updated with current security patches.
- If sandboxing cannot be enabled due to platform constraints, run the entire Skill in a disposable, tightly restricted container or virtual machine.
- Give that environment a read-only or minimal filesystem, no mounted secrets, restricted outbound networking, dropped Linux capabilities, and appropriate seccomp or mandatory-access-control policies.
- Allow navigation only to expected HTTPS origins where operationally feasible.
- Close the browser in a
finallyblock to ensure cleanup after navigation or parsing failures.