CVE-2016-2126
First published: Fri Dec 09 2016(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/samba | <4.5.3 | 4.5.3 |
| redhat/samba | <4.4.8 | 4.4.8 |
| redhat/samba | <4.3.13 | 4.3.13 |
| Samba | >=4.0.0<4.3.13 | |
| Samba | >=4.4.0<4.4.8 | |
| Samba | >=4.5.0<4.5.3 |
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Reference Links
- http://rhn.redhat.com/errata/RHSA-2017-0494.html
- http://rhn.redhat.com/errata/RHSA-2017-0495.html
- http://rhn.redhat.com/errata/RHSA-2017-0662.html
- http://rhn.redhat.com/errata/RHSA-2017-0744.html
- http://www.securityfocus.com/bid/94994
- http://www.securitytracker.com/id/1037495
- https://access.redhat.com/errata/RHSA-2017:1265
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730
- https://www.samba.org/samba/security/CVE-2016-2126.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1405984
- https://rhn.redhat.com/errata/RHSA-2017-0662.html
- https://rhn.redhat.com/errata/RHSA-2017-0744.html
- https://rhn.redhat.com/errata/RHSA-2017-0494.html
- https://rhn.redhat.com/errata/RHSA-2017-0495.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1403115
Frequently Asked Questions
What is the severity of CVE-2016-2126?
CVE-2016-2126 is classified as a high severity vulnerability due to its potential for privilege escalation.
How do I fix CVE-2016-2126?
To fix CVE-2016-2126, update Samba to version 4.5.3 or later, 4.4.8 or later, or 4.3.13 or later depending on your current version.
Who is affected by CVE-2016-2126?
CVE-2016-2126 affects Samba versions from 4.0.0 up to 4.5.2 across various distributions.
What type of attack does CVE-2016-2126 enable?
CVE-2016-2126 enables a remote, authenticated attacker to cause a denial of service by crashing the winbindd process.
Which component of Samba is affected by CVE-2016-2126?
CVE-2016-2126 specifically affects the winbindd process due to improper handling of the PAC checksum.
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