rademacher.de security report

Certificate, security headers, email authentication, DNS, registration, and exposed hosts — from public sources.

38risk

Moderate

Some surface to tighten, nothing urgent.

0Critical

0High

3Medium

6Low

2Info

Collected 15 hours ago4.0sfrom cache

Certificate Transparency15
DNS resolution20
Network ownership0
CDN / WAF detection0
Exposed ports & CVEs67
Registration
DNS posture4
Email authentication2
Certificate
Security headers1
Archived URLs
Analysis11

noteFound 14 addresses; enriching the first 12.
noteCertificate inspection is unavailable in this runtime.
noteNetwork ownership lookup is unavailable in this runtime; ASN and org are omitted.
noteCDN/WAF detection is unavailable in this runtime.
noteNo registration data: RDAP has no record at this level.
note4 hosts were identified as CDN/edge infrastructure from ASN ownership rather than a cdncheck fingerprint.

CSP is the main defence that limits what an injected script can do. Without it, any XSS bug is fully exploitable.
What to do
Start with a report-only policy, tighten it against the reports, then enforce.
asset: https://rademacher.de/
No X-Frame-Options or CSP frame-ancestors directive, so another site can load this page invisibly inside its own and trick users into clicking.
What to do
Send `X-Frame-Options: DENY` or `Content-Security-Policy: frame-ancestors ’none’`.
asset: https://rademacher.de/
Receivers are asked to report spoofing but not to block it. This is the right first step, and the wrong place to stop.
What to do
Once reports look clean, move to p=quarantine, then p=reject.
asset: rademacher.de
Check it is not an open relay.
What to do
Restrict 25/tcp to a VPN, bastion, or allow-listed source range.
asset: 91.137.118.107:25
vpn.rademacher.de appears in Certificate Transparency logs. Names like this usually front staging, admin, or internal tooling, which tends to be patched later and monitored less than production.
What to do
Confirm this host is meant to be public. If not, put it behind SSO or an allow-list.
asset: vpn.rademacher.de
service-test.rademacher.de appears in Certificate Transparency logs. Names like this usually front staging, admin, or internal tooling, which tends to be patched later and monitored less than production.
What to do
Confirm this host is meant to be public. If not, put it behind SSO or an allow-list.
asset: service-test.rademacher.de
Lets browsers guess content types, which turns some upload and text endpoints into script injection points.
What to do
Send `X-Content-Type-Options: nosniff` on every response.
asset: https://rademacher.de/
Full URLs — including any tokens or IDs in them — are sent to every third party the page links to.
What to do
Send `Referrer-Policy: strict-origin-when-cross-origin`.
asset: https://rademacher.de/
Answers for this domain are not signed, so a resolver cannot tell a forged response from a real one.
What to do
Enable DNSSEC at your DNS host and publish the DS record at the registrar.
asset: rademacher.de
Mail to this domain can be downgraded to plaintext by an on-path attacker, because senders have no way to know TLS is required.
What to do
Publish an MTA-STS policy (a TXT record plus a small HTTPS-hosted file).
asset: rademacher.de
Any public certificate authority may issue certificates for this domain. CAA lets you name the ones allowed to.
What to do
Add a CAA record naming your CA, e.g. `0 issue "letsencrypt.org"`.
asset: rademacher.de

final https://rademacher.de/status 200time 1764msstack cloudflare

✓http:// redirects to https://
✓Strict-Transport-Security
max-age=31536000
✗Content-Security-Policy
✗Clickjacking protection
✗X-Content-Type-Options
✗Referrer-Policy
–Permissions-Policyoptional
–security.txt publishedoptional — tells researchers where to report bugs

✓Cookie campaign
Secure · HttpOnly · no SameSite
✓Cookie fmarktcookie_opened
Secure · HttpOnly · no SameSite
✓Cookie fmarktcookie
Secure · HttpOnly · no SameSite
✓Cookie session
Secure · HttpOnly · no SameSite

✓Receives mail via 1 server
rademacher-de.mail.protection.outlook.com
✓SPFends in -all
v=spf1 include:spf.protection.outlook.com ip4:104.40.229.156 ip4:52.169.0.179 include:spf1.rademacher.de include:spf2.rademacher.de include:spf3.rademacher.de include:spf4.rademacher.de -all
!DMARCp=none
v=DMARC1; p=none; pct=100; rua=mailto:dmarc.reports.rdm@rademacher.de,mailto:dmarc_agg@vali.email; ruf=mailto:dmarc.reports.rdm@rademacher.de; fo=1
!MTA-STSinbound mail can be downgraded to plaintext

!DNSSECanswers can be forged
–CAAany CA may issue
–IPv6 (AAAA)IPv4 only
✓4 nameservers
ns-10.awsdns-01.com ns-1261.awsdns-29.org ns-1907.awsdns-46.co.uk ns-681.awsdns-21.net

Address	Ports	Edge	Network
104.21.88.69 service-test.rademacher.de +3	80443205220532082208320862087+5	Cloudflare~	—
172.67.173.164 service-test.rademacher.de +1	80443205220532082208320862087+5	Cloudflare~	—
104.21.29.202 service.rademacher.de +2	80443205220532082208320862087+5	Cloudflare~	—
172.67.149.199 service.rademacher.de +2	80443205220532082208320862087+5	Cloudflare~	—
91.137.118.107 archiv.rademacher.de	25179465587995	direct	—
91.137.118.110 vpn.rademacher.de +1	80179443	direct	—
34.117.1.144 rademacher.de +10	80443	direct	—
91.137.118.106 swyx.rademacher.de +1	80179	direct	—
40.99.10.104 autodiscover.rademacher.de	80	direct	—
40.99.33.168 autodiscover.rademacher.de	80	direct	—
52.98.189.248 autodiscover.rademacher.de	80	direct	—
34.116.214.52 scim.rademacher.de	none known	direct	—

Archived URLs

Endpoints the Wayback Machine has kept — config files, backups, scripts. Slow to fetch, so it is here on request.

rademacher.de security report

Moderate

Findings

Security headers

Email authentication

DNS

Hosts

Hostnames