CVE Catalog

CVE-2015-8960

High
Published: Translated: NVD NIST

Summary

TLS protocol 1.2 and earlier versions support ClientCertificateType values that may allow man-in-the-middle attackers to spoof TLS servers. This issue arises from the lack of documentation regarding the computation of the master secret in certain situations, making it easier to exploit a compromised X.509 client key.

Risk Assessment

Organizations may be vulnerable to attacks where attackers can impersonate TLS servers, potentially leading to data leakage or session hijacking.

Recommendation

It is recommended to upgrade to a newer version of the TLS protocol and implement additional security measures to minimize the risk of man-in-the-middle attacks.

Related vulnerabilities

Original NVD description (English source)

The TLS protocol 1.2 and earlier supports the rsa_fixed_dh, dss_fixed_dh, rsa_fixed_ecdh, and ecdsa_fixed_ecdh values for ClientCertificateType but does not directly document the ability to compute the master secret in certain situations with a client secret key and server public key but not a server secret key, which makes it easier for man-in-the-middle attackers to spoof TLS servers by leveraging knowledge of the secret key for an arbitrary installed client X.509 certificate, aka the "Key Compromise Impersonation (KCI)" issue.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS