From 21b685b91bbd3de879697a38da7f8108e9efbea1 Mon Sep 17 00:00:00 2001 From: Andrew Clark Date: Tue, 4 Sep 2018 11:27:17 -0700 Subject: [PATCH] Use file name whitelist to prevent RCE Summary: Use a whitelist to validate user-provided file names. This doesn't cover the entire range of valid filenames but should cover almost all of them in practice. Allows letters, numbers, periods, dashes, and underscores. Opting to use a whitelist instead of a blacklist because getting this wrong leaves us vulnerable to a RCE attack. This is the same patch I submitted to create-react-app: https://github.com/facebook/create-react-app/pull/4866 See s163726 for more details Reviewed By: LukasReschke Differential Revision: D9504148 fbshipit-source-id: e3c7587f1b7f93bec90a58a38d5f6d58f1f59275 --- local-cli/server/util/launchEditor.js | 31 +++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/local-cli/server/util/launchEditor.js b/local-cli/server/util/launchEditor.js index 8b9f1729e10f35..1bd5b1234ed2ba 100644 --- a/local-cli/server/util/launchEditor.js +++ b/local-cli/server/util/launchEditor.js @@ -42,6 +42,11 @@ var COMMON_EDITORS = { '/Applications/WebStorm.app/Contents/MacOS/webstorm': 'webstorm', }; +// Transpiled version of: /^[\p{L}0-9/.\-_\\]+$/u +// Non-transpiled version requires support for Unicode property regex. Allows +// alphanumeric characters, periods, dashes, slashes, and underscores. +const WINDOWS_FILE_NAME_WHITELIST = 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+ function addWorkspaceToArgumentsIfExists(args, workspace) { if (workspace) { args.unshift(workspace); @@ -176,6 +181,32 @@ function launchEditor(fileName, lineNumber, projectRoots) { } else { args.push(fileName); } + + // cmd.exe on Windows is vulnerable to RCE attacks given a file name of the + // form "C:\Users\myusername\Downloads\& curl 172.21.93.52". Use a whitelist + // to validate user-provided file names. This doesn't cover the entire range + // of valid file names but should cover almost all of them in practice. + if ( + process.platform === 'win32' && + !WINDOWS_FILE_NAME_WHITELIST.test(fileName.trim()) + ) { + console.log(); + console.log( + chalk.red( + 'Could not open ' + path.basename(fileName) + ' in the editor.', + ), + ); + console.log(); + console.log( + 'When running on Windows, file names are checked against a whitelist ' + + 'to protect against remote code execution attacks. File names may ' + + 'consist only of alphanumeric characters (all languages), periods, ' + + 'dashes, slashes, and underscores.', + ); + console.log(); + return; + } + console.log( 'Opening ' + chalk.underline(fileName) + ' with ' + chalk.bold(editor), );