Feat ew2 #11
Feat ew2 #11
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| const homeDeno = path.resolve(os.homedir(), '.deno/bin/deno'); | ||
| function checkDeno(command: string) { | ||
| return new Promise((resolve, reject) => { | ||
| exec(`${command} --version`, (err) => { |
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Shell command built from environment values Medium
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AI 9 months ago
To fix the problem, we should avoid constructing the shell command dynamically and instead use execFile or execFileSync to pass the command and its arguments separately. This approach ensures that the shell does not interpret the command string, thus preventing command injection vulnerabilities.
Specifically, we need to:
- Replace the use of
execwithexecFilein thecheckDenofunction. - Modify the
checkDenofunction to pass the command and its arguments separately.
| @@ -1,2 +1,2 @@ | ||
| import { exec, execSync } from 'child_process'; | ||
| import { execFile, execSync } from 'child_process'; | ||
| import os from 'os'; | ||
| @@ -26,3 +26,3 @@ | ||
| return new Promise((resolve, reject) => { | ||
| exec(`${command} --version`, (err) => { | ||
| execFile(command, ['--version'], (err) => { | ||
| if (err) { |
| const p = path.join(__dirname, './install'); | ||
| const installCommand = `sh ${p}/installEw2.sh ${manifest.version}`; | ||
| try { | ||
| execSync(installCommand, { stdio: 'inherit', env: { ...process.env } }); |
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Uncontrolled command line Critical
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AI 9 months ago
To fix the problem, we should avoid using execSync with a concatenated string that includes untrusted data. Instead, we can use execFileSync which allows us to pass command arguments as an array, thus avoiding the risk of command injection. This approach ensures that the command and its arguments are properly separated and handled securely by the operating system.
We need to modify the installEw2 function to use execFileSync instead of execSync. We will also need to import execFileSync from the child_process module.
| @@ -5,3 +5,3 @@ | ||
| import https from 'https'; | ||
| import { execSync } from 'child_process'; | ||
| import { execFileSync } from 'child_process'; | ||
| import logger from '../libs/logger.js'; | ||
| @@ -117,5 +117,5 @@ | ||
| const p = path.join(__dirname, './install'); | ||
| const installCommand = `sh ${p}/installEw2.sh ${manifest.version}`; | ||
| const installScript = path.join(p, 'installEw2.sh'); | ||
| try { | ||
| execSync(installCommand, { stdio: 'inherit', env: { ...process.env } }); | ||
| execFileSync('sh', [installScript, manifest.version], { stdio: 'inherit', env: { ...process.env } }); | ||
| const md5 = await calculateFileMD5(EW2BinPath); |
| const workerRes = await fetch( | ||
| `http://${localUpstream ? localUpstream : host}${url}`, | ||
| { | ||
| method, | ||
| headers: { | ||
| ...headers, | ||
| 'x-er-context': | ||
| 'eyJzaXRlX2lkIjogIjYyMjcxODQ0NjgwNjA4IiwgInNpdGVfbmFtZSI6ICJjb21wdXRlbHguYWxpY2RuLXRlc3QuY29tIiwgInNpdGVfcmVjb3JkIjogIm1vY2hlbi1uY2RuLmNvbXB1dGVseC5hbGljZG4tdGVzdC5jb20iLCAiYWxpdWlkIjogIjEzMjI0OTI2ODY2NjU2MDgiLCAic2NoZW1lIjoiaHR0cCIsICAiaW1hZ2VfZW5hYmxlIjogdHJ1ZX0=', | ||
| 'x-er-id': 'a.bA' | ||
| }, | ||
| body: req.method === 'GET' ? undefined : req, | ||
| agent: new HttpProxyAgent(`http://127.0.0.1:${ew2Port}`) | ||
| } | ||
| ); |
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Server-side request forgery Critical
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AI 4 months ago
To fix the SSRF vulnerability:
- Restrict the use of
host: Replace the user-providedreq.headers.hostwith a fixed, pre-approved value or restrict it to an allowlist of trusted hosts. - Sanitize
url: Ensurereq.urldoes not contain malicious input (e.g., path traversal or query manipulation). - Use a known-safe base for URLs: Construct the URL using a hardcoded base or a validated and sanitized alternative.
The best fix is to introduce an allowlist of trusted hosts and safely construct the URL using validated components. This ensures the application only communicates with pre-approved endpoints, mitigating SSRF risks.
| @@ -161,8 +161,9 @@ | ||
| } | ||
| } | ||
| try { | ||
| const host = req.headers.host; | ||
| const url = req.url; | ||
| const trustedHosts = ['allowed-host1.com', 'allowed-host2.com']; | ||
| const host = trustedHosts.includes(req.headers.host || '') ? req.headers.host : 'default-host.com'; | ||
| const url = new URL(req.url || '/', `http://${host}`); | ||
| const method = req.method; | ||
| const headers = Object.entries(req.headers).reduce( | ||
| (acc: Record<string, string | undefined>, [key, value]) => { | ||
| @@ -180,7 +181,7 @@ | ||
| // @ts-ignore | ||
| const localUpstream = global.localUpstream; | ||
| const workerRes = await fetch( | ||
| `http://${localUpstream ? localUpstream : host}${url}`, | ||
| `http://${localUpstream ? localUpstream : url.hostname}${url.pathname}${url.search}`, | ||
| { | ||
| method, | ||
| headers: { |
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