Description
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.
CVSS Metrics
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- network
- Complexity
- high
- Privileges
- none
- User Action
- none
- Scope
- unchanged
- Confidentiality
- high
- Integrity
- high
- Availability
- high
- Weaknesses
- CWE-295
Metadata
- Primary Vendor
- IETF
- Published
- 9/21/2016
- Last Modified
- 4/12/2025
- Source
- NIST NVD
- Note: Verify all details with official vendor sources before applying patches.
Affected Products
ietf : transport_layer_securitynetapp : clustered_data_ontap_antivirus_connectornetapp : data_ontap_edgenetapp : host_agentnetapp : oncommand_shiftnetapp : plug-in_for_symantec_netbackupnetapp : smi-s_providernetapp : snap_creator_frameworknetapp : snapdrivenetapp : snapdrivenetapp : snapmanagernetapp : snapmanagernetapp : snapprotectnetapp : solidfire_\&_hci_management_nodenetapp : system_setup
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