CVE-2021-32619
📋 TL;DR
This vulnerability allows Deno modules imported dynamically via import() or new Worker to bypass network and file system permission checks when statically importing other modules. It affects Deno versions 1.5.0 through 1.10.1, potentially enabling unauthorized access to resources.
💻 Affected Systems
- Deno
📦 What is this software?
Deno by Deno
⚠️ Risk & Real-World Impact
Worst Case
An attacker could execute arbitrary code, access sensitive files, or make unauthorized network requests by exploiting the permission bypass.
Likely Case
Malicious modules could access local files or network resources without proper authorization, leading to data exfiltration or privilege escalation.
If Mitigated
With proper sandboxing and minimal permissions, impact is limited to the specific resources accessible within the sandbox.
🎯 Exploit Status
Exploitation requires the ability to execute dynamic imports in a vulnerable Deno environment.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.10.2
Vendor Advisory: https://github.com/denoland/deno/security/advisories/GHSA-xpwj-7v8q-mcgj
Restart Required: Yes
Instructions:
1. Update Deno to version 1.10.2 or later using your package manager. 2. Restart any running Deno applications. 3. Verify the update with 'deno --version'.
🔧 Temporary Workarounds
Restrict dynamic imports
allDisable or restrict the use of dynamic imports (import() and new Worker) in your Deno applications.
Run with minimal permissions
allUse Deno's permission flags to limit network and file system access.
deno run --allow-net=example.com --allow-read=/safe/path app.ts
🧯 If You Can't Patch
- Isolate Deno applications in containers or VMs to limit potential damage.
- Implement strict input validation and sandboxing for user-provided modules.
🔍 How to Verify
Check if Vulnerable:
Run 'deno --version' and check if the version is between 1.5.0 and 1.10.1 inclusive.Check Version:
deno --versionVerify Fix Applied:
After updating, run 'deno --version' to confirm version is 1.10.2 or higher.📡 Detection & Monitoring
Log Indicators:
- Unexpected file system access or network connections from Deno processes
- Dynamic import attempts in logs
Network Indicators:
- Unusual outbound connections from Deno applications
- Requests to unexpected domains or IPs
SIEM Query:
process.name:deno AND (event.action:file_read OR event.action:network_connection)