Summary
Steve used a TLS configuration that did not validate certificates presented by remote servers by default. An attacker positioned between Steve and a connected service could impersonate that service, intercept communications, or potentially alter data exchanged over the connection.
Steve used a TLS configuration that did not validate certificates presented by remote servers by default. An attacker positioned between Steve and a connected service could impersonate that service, intercept communications, or potentially alter data exchanged over the connection.
Affected context
The vulnerability occurs when Steve establishes TLS connections using the insecure default that accepts remote certificates without proper validation. It is most risky in environments where network traffic can be intercepted, redirected, or manipulated, such as untrusted networks, compromised infrastructure, or misconfigured proxy paths.
The vulnerability occurs when Steve establishes TLS connections using the insecure default that accepts remote certificates without proper validation. It is most risky in environments where network traffic can be intercepted, redirected, or manipulated, such as untrusted networks, compromised infrastructure, or misconfigured proxy paths.
Exploit preconditions
- Attack surface: Outbound TLS connections initiated by Steve
- Required access: Network positioning or control sufficient to intercept or redirect traffic
- Trigger point: Steve connects to a remote service using the insecure certificate-validation setting
- Why exploitation is possible: The client does not adequately verify that the presented certificate belongs to the intended remote service
- Attack surface: Outbound TLS connections initiated by Steve
- Required access: Network positioning or control sufficient to intercept or redirect traffic
- Trigger point: Steve connects to a remote service using the insecure certificate-validation setting
- Why exploitation is possible: The client does not adequately verify that the presented certificate belongs to the intended remote service
Why this happens
The underlying issue is an insecure TLS client configuration that disables or bypasses certificate validation. This causes the application to trust certificates without establishing that they are issued by an accepted authority and correspond to the intended service, mapping to CWE-295: Improper Certificate Validation.
The underlying issue is an insecure TLS client configuration that disables or bypasses certificate validation. This causes the application to trust certificates without establishing that they are issued by an accepted authority and correspond to the intended service, mapping to CWE-295: Improper Certificate Validation.
Potential impact
- An attacker may impersonate a trusted remote service
- Sensitive data transmitted over the connection could be intercepted
- Network traffic could be modified in transit
- Authentication material or session information could be exposed
- Steve may process attacker-controlled responses as if they came from the legitimate service
- An attacker may impersonate a trusted remote service
- Sensitive data transmitted over the connection could be intercepted
- Network traffic could be modified in transit
- Authentication material or session information could be exposed
- Steve may process attacker-controlled responses as if they came from the legitimate service
General mitigation guidance
Mitigation generally focuses on making certificate and hostname validation secure by default.
Common defensive patterns include:
- Enabling full certificate-chain and hostname validation for all TLS connections
- Trusting only explicitly managed certificate authorities or trust stores
- Avoiding blanket certificate-verification bypasses and insecure fallback modes
- Separating test certificates and development trust settings from production configuration
- Restricting service privileges and limiting the sensitivity of data available to outbound connections
- Protecting trust-store configuration from unauthorized modification
Mitigation generally focuses on making certificate and hostname validation secure by default.
Common defensive patterns include:
- Enabling full certificate-chain and hostname validation for all TLS connections
- Trusting only explicitly managed certificate authorities or trust stores
- Avoiding blanket certificate-verification bypasses and insecure fallback modes
- Separating test certificates and development trust settings from production configuration
- Restricting service privileges and limiting the sensitivity of data available to outbound connections
- Protecting trust-store configuration from unauthorized modification
How teams detect issues like this
Organizations can look for this weakness through:
- Static analysis rules identifying disabled certificate verification or permissive TLS client options
- Code review checks for custom certificate callbacks that accept all certificates
- Configuration reviews covering trust stores, hostname checks, and insecure fallback behavior
- Runtime and proxy telemetry showing unexpected endpoints, certificate changes, or failed validation events
- Policy enforcement requiring validated TLS for production service-to-service communication
Organizations can look for this weakness through:
- Static analysis rules identifying disabled certificate verification or permissive TLS client options
- Code review checks for custom certificate callbacks that accept all certificates
- Configuration reviews covering trust stores, hostname checks, and insecure fallback behavior
- Runtime and proxy telemetry showing unexpected endpoints, certificate changes, or failed validation events
- Policy enforcement requiring validated TLS for production service-to-service communication
Sources
| Source | Link |
|---|---|
| bugzilla. | bugzilla.suse.com/ |
| github. | github.com/ |
