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CVE-2016-2126

6.5 · MEDIUM

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum.

Published May 11, 2017CWE-264EPSS 6.59%

Overview

CVE-2016-2126 is a medium-severity vulnerability. It was published on May 11, 2017 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions.

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

Refrhn.redhat.com/errata/RHSA-2017-0494.htmlRefrhn.redhat.com/errata/RHSA-2017-0495.htmlRefrhn.redhat.com/errata/RHSA-2017-0662.htmlRefrhn.redhat.com/errata/RHSA-2017-0744.htmlRefwww.securityfocus.com/bid/94994Refwww.securitytracker.com/id/1037495Refaccess.redhat.com/errata/RHSA-2017:1265Refkb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730Refwww.samba.org/samba/security/CVE-2016-2126.htmlRefrhn.redhat.com/errata/RHSA-2017-0494.html

How CyberStrike helps

Frequently asked questions

What is CVE-2016-2126?

CVE-2016-2126 is a medium-severity vulnerability. It was published on May 11, 2017 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2016-2126?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2016-2126?

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-2016-2126?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-2126 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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