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CVE-2015-8960

8.1 · HIGH

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…

Published Sep 21, 2016CWE-295EPSS 1.95%

Overview

CVE-2015-8960 is a high-severity vulnerability. It was published on September 21, 2016 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reftwitter.com/matthew_d_green/statuses/630908726950674433Refwww.openwall.com/lists/oss-security/2016/09/20/4Refwww.securityfocus.com/bid/93071Refkcitls.orgRefsecurity.netapp.com/advisory/ntap-20180626-0002/Refwww.usenix.org/system/files/conference/woot15/woot15-paper-hlauschek.pdfReftwitter.com/matthew_d_green/statuses/630908726950674433Refwww.openwall.com/lists/oss-security/2016/09/20/4Refwww.securityfocus.com/bid/93071Refkcitls.org

How CyberStrike helps

Frequently asked questions

What is CVE-2015-8960?

CVE-2015-8960 is a high-severity vulnerability. It was published on September 21, 2016 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2015-8960?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-8960?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-8960?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-8960 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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