Vulnerability in Apple Safari
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.019 (79.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.openwall.com/lists/oss-security/2016/09/20/4 (mailing-list, Technical Description, Mailing List, Third Party Advisory)
- twitter.com/matthew_d_green/statuses/630908726950674433 (Technical Description, Third Party Advisory, Press/Media Coverage)
- www.securityfocus.com/bid/93071 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
- security.netapp.com/advisory/ntap-20180626-0002/ (Third Party Advisory)
- www.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdf (Technical Description, Exploit, Mitigation)
- kcitls.org (Technical Description, Exploit)
Frequently asked questions
- What is CVE-2015-8960?
- CVE-2015-8960 is a high-severity vulnerability in Apple Safari, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2016-09-21.
- How severe is CVE-2015-8960?
- High severity. CVSS v3 base score is 8.1 out of 10.