iisg.nl security report

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

62risk

Elevated

Several issues worth triaging this week.

0Critical

2High

4Medium

5Low

2Info

Collected 56 minutes ago8.0sfrom cache

Certificate Transparency42
DNS resolution7
Network ownership0
CDN / WAF detection0
Exposed ports & CVEs10
Registration
DNS posture3
Email authentication2
Certificate
Security headers3
Archived URLs
Analysis13

noteFound 42 hostnames; this runtime allows 50 outbound requests per scan, so the 21 most likely to matter were resolved.
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.

Shodan matched these CVEs against the service banners it saw on 195.169.88.31 (esta.iisg.nl), which advertise php 7.4.33. These are version-fingerprint matches, not confirmed exploits: a distribution may have back-ported the fix while leaving the banner unchanged. Severity reflects the volume of known issues associated with this host, not a CVSS score. CVE-2024-25117 CVE-2024-5458 CVE-2024-3566 CVE-2022-4900 CVE-2013-2220 CVE-2007-3205
What to do
Confirm the running versions on 195.169.88.31 and compare them against the current security release for each package before treating any single CVE as live.
CVE-2024-25117 ↗CVE-2024-5458 ↗CVE-2024-3566 ↗CVE-2022-4900 ↗CVE-2013-2220 ↗
asset: 195.169.88.31
Shodan matched these CVEs against the service banners it saw on 195.169.88.33 (voices.iisg.nl), which advertise php 8.2.33. These are version-fingerprint matches, not confirmed exploits: a distribution may have back-ported the fix while leaving the banner unchanged. Severity reflects the volume of known issues associated with this host, not a CVSS score. CVE-2013-2220 CVE-2007-3205
What to do
Confirm the running versions on 195.169.88.33 and compare them against the current security release for each package before treating any single CVE as live.
CVE-2013-2220 ↗CVE-2007-3205 ↗
asset: 195.169.88.33
195.169.88.31 (esta.iisg.nl) reports php 7.4.33. 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: 195.169.88.31
195.169.88.33 (voices.iisg.nl) reports php 8.2.33. 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: 195.169.88.33
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://iisg.amsterdam/nl
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: iisg.nl
intranet.iisg.nl 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: intranet.iisg.nl
intranet-archive.iisg.nl 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: intranet-archive.iisg.nl
intranet-natasha.iisg.nl 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: intranet-natasha.iisg.nl
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://iisg.amsterdam/nl
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: iisg.nl
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: iisg.nl
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: iisg.nl

final https://iisg.amsterdam/nlstatus 200time 3064msstack cloudflare · Drupal 10 (https://www.drupal.org)

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

✓Receives mail via 1 server
iisg-nl.mail.protection.outlook.com
✓SPFends in -all
v=spf1 include:spf.protection.outlook.com include:_spf.knaw.nl ip4:195.169.88.200 include:_spf-dc55.sapsf.eu include:servers.mcsv.net include:spf.eprov.eu include:procurios.cloud -all
✓DMARCp=quarantine
v=DMARC1; p=quarantine; pct=100; ruf=mailto:dmarc@diginfra.net; rua=mailto:dmarc@diginfra.net; adkim=r; aspf=r; ri=604800
!MTA-STSinbound mail can be downgraded to plaintext

!DNSSECanswers can be forged
–CAAany CA may issue
–IPv6 (AAAA)IPv4 only
✓3 nameservers
ns0.socialhistoryservices.org ns1.surfnet.nl ns1.zurich.surf.net

✓Registered with SURF B.V.32.3 years old
iisg.nl
–Registration expiry
✗Transfer lock
none
✓3 nameservers at registry
ns0.socialhistoryservices.org ns1.surfnet.nl ns1.zurich.surf.net

Address	Ports	CVEs	Edge	Network
195.169.88.174 iisg.nl +4	80443	0	direct	—
195.169.88.35 cts.iisg.nl +2	80443	0	direct	—
195.169.88.31 esta.iisg.nl +3	80443	6	direct	—
195.169.88.145 lssm.iisg.nl +1	80443	0	direct	—
195.169.88.33 voices.iisg.nl	80443	2	direct	—

Archived URLs

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

iisg.nl security report

Elevated

Findings

Security headers

Email authentication

DNS

Registration

Hosts

Hostnames