CVE-2015-8960 Information

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 Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

http://twitter.com/matthew_d_green/statuses/630908726950674433 http://www.openwall.com/lists/oss-security/2016/09/20/4 http://www.securityfocus.com/bid/93071 https://kcitls.org https://security.netapp.com/advisory/ntap-20180626-0002/ https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdf

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1