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Fix uncontrolled data used in path expression #266

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Fix uncontrolled data used in path expression #266

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34 changes: 26 additions & 8 deletions lib/server.js
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Original file line number Diff line number Diff line change
Expand Up @@ -522,16 +522,34 @@ exports.Server = function Server(bsClient, workers, config, callback) {
response.end();
},
'_patch': function patchHandler(uri, body, request, response) {
var filePath = path.join(__dirname, uri);
logger.trace('_patch', filePath);

handleFile(filePath, request, response, true);
var root = __dirname;
try {
var absPath = path.resolve(root, '.' + uri);
var filePath = fs.realpathSync(absPath);
if (!filePath.startsWith(root)) {
sendError(response, 'Forbidden', 403);
return;
}
logger.trace('_patch', filePath);
handleFile(filePath, request, response, true);
} catch (err) {
sendError(response, 'Invalid path', 400);
}
},
'_default': function defaultHandler(uri, body, request, response) {
var filePath = path.join(process.cwd(), uri);
logger.trace('_default', filePath);

handleFile(filePath, request, response);
var root = process.cwd();
try {
var absPath = path.resolve(root, '.' + uri);
var filePath = fs.realpathSync(absPath);
if (!filePath.startsWith(root)) {
sendError(response, 'Forbidden', 403);
return;
}
logger.trace('_default', filePath);
handleFile(filePath, request, response);
} catch (err) {
sendError(response, 'Invalid path', 400);
}
}
};

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