🛡️ Sentinel: [CRITICAL] Fix command injection in PowerShell execution#291
🛡️ Sentinel: [CRITICAL] Fix command injection in PowerShell execution#291Dexploarer wants to merge 1 commit intomainfrom
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Encoded user input as Base64 when passing to PowerShell via \`runCommand\` in \`performType\` and \`performKeypress\` to prevent command injection vulnerabilities that bypass basic single-quote escaping.
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request resolves a critical command injection vulnerability affecting Windows environments, specifically within the Highlights
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| throw new Error("xdotool required for keyboard input on Linux."); | ||
| } |
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Dependency Handling:
If xdotool is not available on Linux, the function throws an error: throw new Error("xdotool required for keyboard input on Linux.");. While this is consistent with other OS branches, it would be more robust to provide actionable guidance in the error message, such as installation instructions, or to check for the dependency earlier (e.g., during capability detection or at startup). This would allow the API to return a more informative error or disable the endpoint, improving maintainability and user experience.
Recommended Solution:
- Enhance the error message to include installation instructions, e.g.,
"xdotool required for keyboard input on Linux. Please install it using your package manager (e.g., 'sudo apt install xdotool')." - Optionally, check for the dependency at startup and disable the endpoint if missing.
| throw new Error("xdotool required for key input on Linux."); | ||
| } |
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Dependency Handling:
If xdotool is not available on Linux, the function throws an error: throw new Error("xdotool required for key input on Linux.");. As with the previous case, this could be improved by providing actionable guidance or checking for the dependency earlier in the application lifecycle.
Recommended Solution:
- Update the error message to include installation instructions, e.g.,
"xdotool required for key input on Linux. Please install it using your package manager (e.g., 'sudo apt install xdotool')." - Consider checking for the dependency at startup and disabling the endpoint if missing.
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Code Review
This pull request effectively addresses a critical command injection vulnerability in the PowerShell execution for performType and performKeypress on Windows. The switch from string escaping to base64 encoding is a robust and secure solution. I've suggested a minor simplification to the PowerShell commands to improve conciseness, but the core fix is excellent.
| [ | ||
| "-Command", | ||
| `Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.SendKeys]::SendWait('${escaped}')`, | ||
| `Add-Type -AssemblyName System.Windows.Forms; $text = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('${base64}')); [System.Windows.Forms.SendKeys]::SendWait($text)`, |
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The PowerShell command can be simplified by passing the decoded string directly to SendWait. This removes the need for the intermediate $text variable, making the command more concise.
| `Add-Type -AssemblyName System.Windows.Forms; $text = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('${base64}')); [System.Windows.Forms.SendKeys]::SendWait($text)`, | |
| `Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.SendKeys]::SendWait([System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('${base64}')))` |
| [ | ||
| "-Command", | ||
| `Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.SendKeys]::SendWait('${escaped}')`, | ||
| `Add-Type -AssemblyName System.Windows.Forms; $keys = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('${base64}')); [System.Windows.Forms.SendKeys]::SendWait($keys)`, |
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Similar to the performType function, this PowerShell command can be made more concise. You can remove the intermediate $keys variable and pass the decoded string directly to the SendWait method.
| `Add-Type -AssemblyName System.Windows.Forms; $keys = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('${base64}')); [System.Windows.Forms.SendKeys]::SendWait($keys)`, | |
| `Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.SendKeys]::SendWait([System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('${base64}')))` |
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Severity: CRITICAL
Vulnerability: Command injection vulnerability in
performTypeandperformKeypressfor Windows when usingpowershell -Commandwith simple string replacement.Impact: Arbitrary code execution on the host machine as unsanitized user inputs could bypass simplistic single quote escaping.
Fix: Native base64 encoding from Node into the Powershell script block to avoid quoting problems altogether.
Verification: Validated that the tests all passed including e2e execution. Reviewed the changes carefully via code review to ensure this works.
PR created automatically by Jules for task 12766772756934151057 started by @Dexploarer