Summary
NetEase Cloud Music for Windows does not properly validate TLS server certificates, including certificate chains, hostnames, or Windows trust stores. A network-adjacent attacker who can conduct a man-in-the-middle attack may decrypt HTTPS traffic, capture authenticated session credentials, and alter server responses.
NetEase Cloud Music for Windows does not properly validate TLS server certificates, including certificate chains, hostnames, or Windows trust stores. A network-adjacent attacker who can conduct a man-in-the-middle attack may decrypt HTTPS traffic, capture authenticated session credentials, and alter server responses.
Affected context
The issue affects Windows installations of the NetEase Cloud Music client, including the reported 3.1.38 and 3.1.39.205426 versions, when the application establishes HTTPS connections without relying on proper certificate and hostname validation. Risk is higher on untrusted or attacker-controlled networks where traffic can be redirected through an interception point.
The issue affects Windows installations of the NetEase Cloud Music client, including the reported 3.1.38 and 3.1.39.205426 versions, when the application establishes HTTPS connections without relying on proper certificate and hostname validation. Risk is higher on untrusted or attacker-controlled networks where traffic can be redirected through an interception point.
Exploit preconditions
- Attack surface: HTTPS connections initiated by the Windows desktop client
- Required access: Network-adjacent positioning sufficient to intercept or redirect client traffic
- Trigger point: Authenticated API requests and other TLS-protected communications
- Why exploitation is possible: The client fails to validate the server certificate chain, verify the intended hostname, and consult an appropriate Windows certificate trust store, allowing a rogue certificate authority or certificate to be accepted
- Attack surface: HTTPS connections initiated by the Windows desktop client
- Required access: Network-adjacent positioning sufficient to intercept or redirect client traffic
- Trigger point: Authenticated API requests and other TLS-protected communications
- Why exploitation is possible: The client fails to validate the server certificate chain, verify the intended hostname, and consult an appropriate Windows certificate trust store, allowing a rogue certificate authority or certificate to be accepted
Why this happens
The vulnerability results from incomplete or absent TLS peer authentication in the client networking implementation. By failing to validate certificate chains, hostnames, and trusted roots, the application treats an untrusted endpoint as legitimate. This maps to CWE-295: Improper Certificate Validation, in which a certificate is accepted without establishing that it is trusted and belongs to the intended server.
The vulnerability results from incomplete or absent TLS peer authentication in the client networking implementation. By failing to validate certificate chains, hostnames, and trusted roots, the application treats an untrusted endpoint as legitimate. This maps to CWE-295: Improper Certificate Validation, in which a certificate is accepted without establishing that it is trusted and belongs to the intended server.
Potential impact
- Attackers may decrypt sensitive HTTPS traffic
- Session credentials such as the
MUSIC_Uvalue could be captured - Compromised session credentials may enable account takeover
- Attackers could modify API responses in transit
- Client behavior, displayed content, or application state could be manipulated
- Sensitive account or usage information may be exposed
- Attackers may decrypt sensitive HTTPS traffic
- Session credentials such as the
MUSIC_Uvalue could be captured - Compromised session credentials may enable account takeover
- Attackers could modify API responses in transit
- Client behavior, displayed content, or application state could be manipulated
- Sensitive account or usage information may be exposed
General mitigation guidance
Mitigation generally focuses on making server authentication mandatory and reducing trust in network-provided inputs.
Common defensive patterns include:
- Use a mature TLS implementation with certificate-chain and hostname validation enabled by default
- Validate the server certificate against an appropriate operating-system or application trust store
- Reject expired, malformed, self-signed, untrusted, or hostname-mismatched certificates
- Avoid fallback modes that continue communication after validation errors
- Protect session credentials with secure transport and minimize their exposure and lifetime
- Apply least privilege to client processes and limit the value of captured credentials through session controls
- Monitor for unexpected certificate authorities, proxying, or TLS interception in managed environments
Mitigation generally focuses on making server authentication mandatory and reducing trust in network-provided inputs.
Common defensive patterns include:
- Use a mature TLS implementation with certificate-chain and hostname validation enabled by default
- Validate the server certificate against an appropriate operating-system or application trust store
- Reject expired, malformed, self-signed, untrusted, or hostname-mismatched certificates
- Avoid fallback modes that continue communication after validation errors
- Protect session credentials with secure transport and minimize their exposure and lifetime
- Apply least privilege to client processes and limit the value of captured credentials through session controls
- Monitor for unexpected certificate authorities, proxying, or TLS interception in managed environments
How teams detect issues like this
Organizations can look for this weakness through:
- Static analysis and code review of TLS, HTTP, and certificate-verification code paths
- Tests using expired, untrusted, revoked, self-signed, and hostname-mismatched certificates
- Review signals such as disabled verification callbacks, trust-all settings, ignored validation errors, or custom certificate checks without hostname validation
- Dynamic testing with controlled interception proxies to confirm that invalid certificates are rejected
- Endpoint and network monitoring for unexpected TLS proxying or certificate-authority changes
- Policy enforcement requiring approved TLS libraries and secure verification defaults
Automated application-security review tools may help identify insecure certificate handling, but runtime testing is useful for confirming effective validation behavior.
Organizations can look for this weakness through:
- Static analysis and code review of TLS, HTTP, and certificate-verification code paths
- Tests using expired, untrusted, revoked, self-signed, and hostname-mismatched certificates
- Review signals such as disabled verification callbacks, trust-all settings, ignored validation errors, or custom certificate checks without hostname validation
- Dynamic testing with controlled interception proxies to confirm that invalid certificates are rejected
- Endpoint and network monitoring for unexpected TLS proxying or certificate-authority changes
- Policy enforcement requiring approved TLS libraries and secure verification defaults
Automated application-security review tools may help identify insecure certificate handling, but runtime testing is useful for confirming effective validation behavior.
Sources
| Source | Link |
|---|---|
| gist. | gist.github.com/ |
| hr. | hr.163.com/ |
| vulncheck. | vulncheck.com/ |
