CVE-2015-8960
HIGH severity · CVSS 8.1 · CWE-295
8.1CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)2%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdfExploit
- http://twitter.com/matthew_d_green/statuses/630908726950674433Advisory
- http://www.openwall.com/lists/oss-security/2016/09/20/4Advisory
- http://www.securityfocus.com/bid/93071Advisory
- https://security.netapp.com/advisory/ntap-20180626-0002/Advisory
- https://kcitls.orgExploit