CyberFurl can load analytics only after you opt in. Core product features work without analytics consent.
SSL/TLS Security
SSL/TLS Security42 Continuous Controls
SSL/TLS Security
Introduction to Cryptographic Attack Surface Management
In modern enterprise architectures, cryptographic hygiene is no longer a localized IT operations task—it is a critical pillar of proactive cybersecurity and External Attack Surface Management (EASM). The SSL/TLS Security intelligence pillar within the CyberFurl platform provides unparalleled visibility, continuous monitoring, and automated remediation capabilities for your organization's entire public key infrastructure (PKI) footprint.
As threat actors increasingly target misconfigured transport layer security, expired certificates causing catastrophic service outages, and weak encryption algorithms susceptible to downgrade attacks, maintaining a real-time inventory of your cryptographic posture is mandatory. CyberFurl continuously maps, interrogates, and validates every TLS-enabled endpoint across your infrastructure, ensuring strict compliance with zero-trust principles, industry frameworks (such as NIST SP 800-52r2), and internal corporate security policies.
This document details exactly how the CyberFurl SSL/TLS Security pillar operates, what it monitors, the risks it mitigates, and how your engineering and security operations teams can leverage our API and remediation pipelines to maintain a flawless encryption posture.
What This Pillar Monitors
CyberFurl’s global sensor network continuously performs non-intrusive cryptographic handshakes and DNS interrogations against your designated assets. Our monitoring engine evaluates multiple dimensions of SSL/TLS health and configuration.
1. Certificate Expiry and Lifecycle Anomalies
The platform continuously parses X.509 v3 certificates across all exposed ports (not just 443/tcp, but mail servers on 465/993, databases on 5432/3306, etc.). CyberFurl tracks the Not Before and Not After timestamps, extracting the remaining validity period. Additionally, the system monitors automated renewal pipelines (such as ACME/Let's Encrypt) to ensure that scheduled renewals execute successfully before the critical 30-day threshold. We also monitor for certificate revocation via CRL (Certificate Revocation List) and OCSP (Online Certificate Status Protocol) stapling statuses.
2. Weak Ciphers and Cryptographic Algorithms
A perfectly valid certificate provides no defense if the underlying tunnel is established using deprecated algorithms. CyberFurl forces endpoints to negotiate across a massive matrix of cipher suites, identifying servers that still support:
NULL ciphers or export-grade cryptography (e.g., 40-bit or 56-bit keys).
Algorithms utilizing weak message authentication codes (MACs) like MD5 or SHA-1.
Inadequate Diffie-Hellman (DH) parameters (e.g., groups smaller than 2048-bit).
3. TLS Protocol Versions
The transition away from legacy protocols is heavily enforced by compliance frameworks like PCI-DSS and HIPAA. CyberFurl detects and alerts on endpoints that permit connections using:
SSL v2 and SSL v3
TLS 1.0 and TLS 1.1
We proactively monitor your migration toward TLS 1.2 (as a minimum baseline) and TLS 1.3, specifically checking for secure configurations of modern features like 0-RTT (Early Data) which, if misconfigured, can introduce replay attack vulnerabilities.
4. Certificate Authority Authorization (CAA) Records
Domain Name System (DNS) hygiene is inextricably linked to TLS security. CyberFurl's DNS intelligence engine continually monitors your zones for CAA resource records (RFC 8659). We verify that your domains strictly specify which Certificate Authorities (CAs) are authorized to issue certificates (issue and issuewild tags), and whether you have configured the iodef tag to receive real-time notifications from CAs if a rogue issuance attempt occurs.
5. Subject Alternative Name (SAN) and Wildcard Sprawl
Overly permissive certificates—particularly wildcard certificates (*.example.com) distributed across disparate infrastructure environments—represent significant lateral movement risks if a private key is compromised. CyberFurl tracks the deployment of wildcard certificates and flags instances where a single keypair is reused across overly broad infrastructure segments. We also catalog all SANs to uncover undocumented or "shadow" subdomains exposed via certificate transparency logs and endpoint analysis.
Security Controls Covered
The SSL/TLS Security Pillar encompasses 42 distinct continuous security controls. Below are the primary control categories evaluated during every assessment cycle:
Protocol Enforcement:
TLS_PROTOCOL_SSLV2_ENABLED: Fails if SSLv2 is supported.
TLS_PROTOCOL_SSLV3_ENABLED: Fails if SSLv3 is supported.
TLS_PROTOCOL_TLS10_ENABLED: Fails if TLS 1.0 is supported.
TLS_PROTOCOL_TLS11_ENABLED: Fails if TLS 1.1 is supported.
TLS_PROTOCOL_TLS12_MISSING: Fails if TLS 1.2 is NOT supported.
Cipher Suite Hardening:
CIPHER_RC4_ENABLED: Fails if any RC4 suite is negotiated.
CIPHER_3DES_ENABLED: Fails if 3DES (Sweet32 vulnerability) is supported.
CIPHER_WEAK_MAC: Fails if MD5 or SHA1 is used for HMAC.
CIPHER_ANON_DH: Fails if anonymous Diffie-Hellman (no authentication) is permitted.
CIPHER_CBC_MODE: Flags block ciphers operating in Cipher Block Chaining mode due to timing vulnerabilities (e.g., Lucky13).
Certificate Integrity:
CERT_EXPIRED: Triggers when valid_to is in the past.
CERT_EXPIRING_30D: Triggers when valid_to is within 30 days.
CERT_WEAK_SIGNATURE: Fails if the certificate is signed with SHA-1 or MD5.
CERT_WEAK_KEY: Fails if RSA key size is < 2048 bits or ECC curve is deprecated.
CERT_SELF_SIGNED: Flags untrusted, self-signed certificates on public endpoints.
CERT_NAME_MISMATCH: Fails if the endpoint hostname does not match the CN or SANs.
DNS & PKI Controls:
DNS_CAA_MISSING: Flags root and highly privileged subdomains lacking CAA records.
DNS_CAA_INVALID_CA: Flags if a CAA record permits a deprecated or untrusted CA.
TLS_OCSP_STAPLING_MISSING: Flags lack of OCSP stapling, reducing client privacy and performance.
TLS_HSTS_MISSING: Verifies the presence of HTTP Strict Transport Security (HSTS) headers over the encrypted channel.
Risks Detected
Failing to continuously monitor SSL/TLS configurations introduces profound technical and business risks. CyberFurl helps you preemptively neutralize the following outcomes:
Business Continuity and Outages
The most common and visible risk of poor PKI management is application downtime. When a certificate expires, modern browsers instantly block access with terrifying interstitial warnings (e.g., NET::ERR_CERT_DATE_INVALID). For APIs, expired certificates result in immediate connection resets, breaking microservice communication, payment gateways, and B2B integrations. CyberFurl treats certificate expiration as a critical availability threat, ensuring you never experience a certificate-induced outage.
Machine-in-the-Middle (MITM) Attacks
If an endpoint supports weak cryptography or anonymous key exchanges, active network adversaries can intercept the connection, downgrade the security parameters, and decrypt the payload in real-time. This exposes authentication tokens, PII, financial data, and proprietary intellectual property to attackers positioned on the network path (e.g., malicious Wi-Fi, compromised ISPs, BGP hijacks).
Rogue Certificate Issuance
Without enforcing CAA records, any CA in the global trust store can technically issue a certificate for your domain if an attacker manages to spoof domain validation (e.g., via DNS hijacking or compromising an intermediate proxy). By lacking CAA constraints, you leave your domain vulnerable to impersonation attacks that can bypass standard network defenses.
Regulatory and Compliance Penalties
HIPAA, PCI-DSS v4.0, GDPR, and SOC 2 heavily penalize the transmission of sensitive data over inadequately protected channels. Supporting TLS 1.0 or using deprecated ciphers explicitly violates these frameworks, leading to failed audits, financial penalties, and loss of vendor certifications.
Threat Examples
To understand the necessity of this intelligence pillar, consider how specific vulnerabilities have historically been weaponized—and how CyberFurl detects their modern variants.
The Downgrade Attack (POODLE / BEAST)
Historically, attacks like POODLE (Padding Oracle On Downgraded Legacy Encryption) targeted servers that supported SSLv3 alongside modern protocols. An attacker would intentionally inject network faults to force the client and server to abandon TLS 1.2 and fall back to SSLv3. Once downgraded, the attacker exploited cryptographic flaws in SSLv3's CBC mode to decrypt secure cookies.
CyberFurl Defense: We continuously scan for fallback support and legacy protocol enablement, alerting you immediately if a load balancer or web server update accidentally re-enables SSLv3, TLS 1.0, or TLS 1.1.
The Collision Attack (Sweet32)
The Sweet32 vulnerability targets legacy 64-bit block ciphers like 3DES. Because the block size is small, an attacker observing a large amount of encrypted traffic (around 32GB) can detect mathematical collisions, eventually recovering session cookies or credentials.
CyberFurl Defense: Our engine tests the cipher preference order and complete suite support of your endpoints, explicitly flagging TLS_RSA_WITH_3DES_EDE_CBC_SHA and similar suites for immediate removal.
The Rogue CA Hijack
In a scenario where an attacker compromises a vulnerable DNS provider, they can temporarily route traffic for yourdomain.com to their own servers, request a legitimate certificate from an automated CA like Let's Encrypt, and then use that trusted certificate to host phishing pages or intercept API calls.
CyberFurl Defense: By mandating and monitoring strict CAA records (e.g., restricting issuance only to DigiCert), Let's Encrypt will strictly refuse the attacker's automated issuance request, stopping the attack in the reconnaissance phase. CyberFurl alerts if this CAA record is tampered with or removed.
Continuous Monitoring Workflow
CyberFurl’s architecture is designed for scale, precision, and low-latency detection. The SSL/TLS monitoring workflow operates seamlessly across your mapped attack surface.
1. Asset Discovery and Targeting
The workflow begins via our External Attack Surface Management (EASM) engine. Whenever a new subdomain, IP address, or port is discovered, it is immediately queued for cryptographic analysis. This ensures that shadow IT—such as an engineer spinning up a temporary staging server on port 8443—is immediately evaluated.
2. Deep Protocol Handshakes
CyberFurl utilizes a custom, heavily modified TLS scanning engine (built in Golang and Rust) that does not rely on standard system SSL libraries. This allows our scanners to intentionally speak "bad cryptography." The scanner initiates hundreds of parallel ClientHello requests against the target, offering specific combinations of protocols, ciphers, and extensions to definitively map the server's accepted configurations.
3. X.509 Parsing and Validation
Upon retrieving the certificate chain, our engine parses the raw ASN.1 structure. We analyze the leaf certificate, intermediate CAs, and root trust anchors. The system cross-references the chain against the Mozilla NSS root store to verify public trust. We also extract all Subject Alternative Names (SANs) and feed them back into the EASM engine for further discovery.
4. Diffie-Hellman Parameter Analysis
If ephemeral key exchanges (DHE/ECDHE) are supported, the scanner analyzes the prime modulus size and the specific elliptic curves offered by the server. We alert if deprecated curves (e.g., secp112r1) or small prime groups (under 2048 bits) are detected, ensuring perfect forward secrecy (PFS) is genuinely secure.
5. DNS CAA and CT Log Correlation
Simultaneously, our DNS nodes query the authoritative nameservers for the endpoint's domains, extracting CAA records. Furthermore, the extracted certificates are queried against global Certificate Transparency (CT) logs to identify if the certificate was issued legitimately or if other unknown certificates exist for the same domain.
Alerts Generated
When a configuration drift or vulnerability is detected, CyberFurl generates a rich, structured alert. These alerts are highly contextualized, providing the exact technical evidence required by site reliability engineers (SREs) and security analysts.
Below is an example of an alert payload generated when a weak cipher (3DES) and an expiring certificate are detected on a production ingress controller:
{
"alert_id": "evt_tls_99827364",
"pillar": "SSL/TLS Security",
"severity": "CRITICAL",
"timestamp": "2026-06-04T08:15:00Z",
"target": {
"hostname": "api.production.example.com",
"ip_address": "203.0.113.42",
"port": 443
},
"violations": [
{
"control_id": "CERT_EXPIRING_7D",
"title": "Impending Certificate Expiration",
"description": "The leaf certificate for this endpoint will expire in 6 days, 4 hours.",
"evidence": {
"subject_cn": "api.production.example.com",
"issuer_cn": "Let's Encrypt Authority X3",
"valid_from": "2026-03-12T12:00:00Z",
"valid_to": "2026-06-10T12:00:00Z",
"days_remaining": 6.16
}
},
{
"control_id": "CIPHER_3DES_ENABLED",
"title": "Sweet32 Vulnerability: 3DES Cipher Suite Supported",
"description": "The server negotiated a TLS connection using a deprecated 64-bit block cipher.",
"evidence": {
"protocol": "TLSv1.2",
"negotiated_cipher": "TLS_RSA_WITH_3DES_EDE_CBC_SHA",
"key_exchange": "RSA",
"authentication": "RSA",
"encryption": "3DES(168)",
"mac": "SHA1"
}
}
],
"context": {
"environment": "production",
"asset_owner": "platform-engineering",
"last_seen_healthy": "2026-05-30T14:00:00Z"
}
}
This JSON payload can be routed directly into your SIEM, trigger PagerDuty incidents based on the CRITICAL severity, or open a Jira ticket assigned to platform-engineering.
Remediation Guidance
Detecting weak cryptographic posture is only half the battle. CyberFurl provides exact, copy-paste ready remediation snippets and infrastructure-as-code (IaC) configurations to resolve the flagged issues instantly.
Resolving Weak Ciphers & Old Protocols
If CyberFurl flags TLS 1.0, TLS 1.1, or weak ciphers like 3DES and RC4, you must update your web server configurations to follow modern cryptography standards (e.g., Mozilla's "Intermediate" or "Modern" compatibility profiles).
Nginx Remediation
To enforce TLS 1.2 and TLS 1.3 only, and restrict cipher suites to secure AEAD algorithms (like GCM and Poly1305), update your nginx.conf within the server block:
# Enforce modern TLS versions
ssl_protocols TLSv1.2 TLSv1.3;
# Prioritize server ciphers over client ciphers
ssl_prefer_server_ciphers on;
# Secure Cipher Suite list (Mozilla Intermediate Profile equivalent)
ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
# Enable HSTS (HTTP Strict Transport Security)
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
# Use strong DH parameters (Ensure you generate this via: openssl dhparam -out /etc/nginx/dhparam.pem 2048)
ssl_dhparam /etc/nginx/dhparam.pem;
Apache Remediation
For Apache HTTP Server, update your ssl.conf or equivalent VirtualHost configuration:
# Disable old protocols
SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1
# Enforce secure ciphers
SSLCipherSuite ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
SSLHonorCipherOrder on
# Enable HSTS
Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
Cloud Infrastructure (AWS ALB via Terraform)
If your endpoints are managed by AWS Application Load Balancers, you cannot change the ciphers manually. Instead, you must attach a secure AWS Security Policy. Update your Terraform configuration to use a modern policy:
To resolve DNS_CAA_MISSING alerts, you must publish CAA records to your domain's DNS zone. If you only want to allow Let's Encrypt and DigiCert to issue certificates, and you want to be alerted at security@example.com if a violation occurs, create the following DNS records:
example.com. IN CAA 0 issue "letsencrypt.org"
example.com. IN CAA 0 issue "digicert.com"
example.com. IN CAA 0 issuewild "digicert.com"
example.com. IN CAA 0 iodef "mailto:security@example.com"
API Integration
CyberFurl is API-first, allowing DevSecOps teams to query cryptographic intelligence programmatically. You can interact with the SSL/TLS pillar using our GraphQL or REST endpoints.
Querying Expiring Certificates via REST API
To build a custom dashboard or integrate with an automated renewal orchestrator, you can query the CyberFurl REST API for all certificates expiring within the next 30 days:
For more complex queries—such as finding all endpoints in the "production" environment that support TLS 1.1 or use a specific weak cipher—use our GraphQL API:
Below is a simple Python script using the requests library to fetch alerts related to CAA record misconfigurations and automatically create Jira tickets:
How does CyberFurl detect impending certificate expirations?
CyberFurl utilizes distributed continuous port scanning combined with real-time X.509 certificate parsing to extract 'Not After' (valid_to) timestamps across your entire external and internal attack surface, generating tiered alerts prior to expiration.
What happens if a weak cipher is detected on a production endpoint?
The platform immediately flags the endpoint, categorizes the risk level based on known vulnerabilities (e.g., Sweet32, Logjam), and provides actionable web server configuration snippets (Nginx, Apache, IIS, HAProxy) to safely disable the vulnerable cipher suite.
Does CyberFurl monitor for DNS CAA record misconfigurations?
Yes, our continuous DNS intelligence engine actively queries Certificate Authority Authorization (CAA) records. We ensure that only explicitly approved CAs are permitted to issue certificates for your domains, effectively neutralizing unauthorized or rogue certificate issuance.
Can we integrate SSL/TLS alerts directly into our SIEM or SOC workflows?
Absolutely. CyberFurl's robust API and webhook ecosystem pushes structured JSON alerts directly to platforms like Splunk, Datadog, Jira, and Slack in real-time whenever a cryptographic policy violation occurs.
