stepteachers.co.uk security report

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

60risk

Elevated

Several issues worth triaging this week.

0Critical

1High

5Medium

5Low

2Info

Collected 14 hours ago20.9sfrom cache

Certificate Transparency18
DNS resolution35
Network ownership0
CDN / WAF detection0
Exposed ports & CVEs78
Registration
DNS posture5
Email authentication2
Certificate
Security headers2
Archived URLs
Analysis13

noteFound 20 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.
note4 hosts were identified as CDN/edge infrastructure from ASN ownership rather than a cdncheck fingerprint.

Database engines should sit behind a private network.
What to do
Restrict 3306/tcp to a VPN, bastion, or allow-listed source range.
asset: 91.232.125.135:3306
FTP transmits credentials in cleartext.
What to do
Restrict 21/tcp to a VPN, bastion, or allow-listed source range.
asset: 91.232.125.135:21
Without HSTS the browser will still try http:// first on a fresh visit, which is the window an on-path attacker uses.
What to do
Send `Strict-Transport-Security: max-age=31536000; includeSubDomains` once you are sure everything works over HTTPS.
asset: https://stepteachers.co.uk/
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://stepteachers.co.uk/
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: stepteachers.co.uk
Without clientTransferProhibited, a compromised registrar account can move the domain to another registrar in days, with no second step.
What to do
Enable the transfer lock (and registrar lock, if offered) in the registrar control panel.
asset: stepteachers.co.uk
91.232.125.135 (dev.stepteachers.co.uk) reports lua-nginx-module 1.31.1.1, exim 4.99.5, mariadb 10.6.27-MariaDB-cll-lve, openresty 1.31.1.1. Publishing precise versions lets anyone match the host against a CVE feed without probing it, which is how targets get shortlisted for mass exploitation after a new advisory lands.
What to do
Suppress version tokens in server banners (for example `ServerTokens Prod` in Apache) and keep the packages current.
asset: 91.232.125.135
Check it is not an open relay.
What to do
Restrict 25/tcp to a VPN, bastion, or allow-listed source range.
asset: 91.232.125.135:25
dev.stepteachers.co.uk 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: dev.stepteachers.co.uk
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://stepteachers.co.uk/
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: stepteachers.co.uk
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: stepteachers.co.uk
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: stepteachers.co.uk

final https://stepteachers.co.uk/status 525time 683msstack cloudflare

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

✓Receives mail via 2 servers
eu-smtp-inbound-1.mimecast.com eu-smtp-inbound-2.mimecast.com
!SPFends in ~all
v=spf1 mx include:_netblocks.mimecast.com include:25151942.spf10.hubspotemail.net ~all
!DMARCp=none
v=DMARC1; p=none;
!MTA-STSinbound mail can be downgraded to plaintext

!DNSSECanswers can be forged
–CAAany CA may issue
–IPv6 (AAAA)IPv4 only
✓5 nameservers
ns0.dnsmadeeasy.com ns1.dnsmadeeasy.com ns2.dnsmadeeasy.com ns3.dnsmadeeasy.com ns4.dnsmadeeasy.com

✓Registered with Team Blue Internet Services UK Limited25.7 years old
stepteachers.co.uk
✓Registration expiry101 days
2026-12-17
✗Transfer lock
none
✓5 nameservers at registry
ns0.dnsmadeeasy.com.ns1.dnsmadeeasy.com.ns2.dnsmadeeasy.com.ns3.dnsmadeeasy.com.ns4.dnsmadeeasy.com.

Address	Ports	Edge	Network
91.232.125.135 dev.stepteachers.co.uk +5	21255380110143443465+6	direct	—
141.101.90.96 lp.stepteachers.co.uk +6	80443205220532082208320862087+5	Cloudflare~	—
141.101.90.97 lp.stepteachers.co.uk +11	80443205220532082208320862087+5	Cloudflare~	—
141.101.90.98 lp.stepteachers.co.uk +5	80443205220532082208320862087+5	Cloudflare~	—
141.101.90.99 lp.stepteachers.co.uk +5	80443205220532082208320862087+5	Cloudflare~	—
13.35.202.52 www.stepteachers.co.uk +2	80443	direct	—
13.35.202.101 www.stepteachers.co.uk +2	80443	direct	—
13.35.202.102 www.stepteachers.co.uk +7	80443	direct	—
13.35.202.2 www.stepteachers.co.uk +2	80443	direct	—
34.241.64.5 stepteachers.co.uk +3	80443	direct	—
185.159.218.210 mail.stepteachers.co.uk	4433	direct	—
40.99.8.200 autodiscover.stepteachers.co.uk	80	direct	—

Archived URLs

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

stepteachers.co.uk security report

Elevated

Findings

Security headers

Email authentication

DNS

Registration

Hosts

Hostnames