CVE-2015-8960

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.

• CWE-295

• https://twitter.com/matthew_d_green/statuses/630908726950674433Press/Media Coverage, Technical Description, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2016/09/20/4Mailing List, Technical Description, Third Party Advisory
• https://www.securityfocus.com/bid/93071Broken Link, Third Party Advisory, VDB Entry
• https://kcitls.orgExploit, Technical Description
• https://security.netapp.com/advisory/ntap-20180626-0002/Third Party Advisory
• https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdfExploit, Mitigation, Technical Description
• https://twitter.com/matthew_d_green/statuses/630908726950674433Press/Media Coverage, Technical Description, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2016/09/20/4Mailing List, Technical Description, Third Party Advisory
• https://www.securityfocus.com/bid/93071Broken Link, Third Party Advisory, VDB Entry
• https://kcitls.orgExploit, Technical Description
• https://security.netapp.com/advisory/ntap-20180626-0002/Third Party Advisory
• https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdfExploit, Mitigation, Technical Description

Published

Sep 21, 2016

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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