NVD - CVE-2016-2126

CVE-2016-2126 Detail

Modified

This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.

Current 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.

Source: MITRE
Description Last Modified: 07/27/2017
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 2.8

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 4.0 MEDIUM
Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.0

Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
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	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037495	Third Party Advisory VDB Entry
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	Vendor Advisory

Technical Details

Vulnerability Type (View All)

Permissions, Privileges, and Access Control (CWE-264)

Vulnerable software and versions Switch to CPE 2.2

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Change History

5 change records found - show changes

CVE Modified by MITRE - 1/4/2018 9:30:36 PM

Action	Type	New Value
Added	Reference	http://rhn.redhat.com/errata/RHSA-2017-0494.html [No Types Assigned]
Added	Reference	http://rhn.redhat.com/errata/RHSA-2017-0495.html [No Types Assigned]
Added	Reference	http://rhn.redhat.com/errata/RHSA-2017-0662.html [No Types Assigned]
Added	Reference	http://rhn.redhat.com/errata/RHSA-2017-0744.html [No Types Assigned]
Added	Reference	https://access.redhat.com/errata/RHSA-2017:1265 [No Types Assigned]

Initial Analysis - 8/7/2017 12:48:11 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 4956 characters. View Entire Change Record OR cpe:2.3:a:samba:samba:4.0.0::::::: cpe:2.3:a:samba:samba:4.0.1::::::: cpe:2.3:a:samba:samba:4.0.2::::::: cpe:2.3:a:samba:samba:4.0.3::::::: cpe:2.3:a:samba:samba:4.0.4::::::: cpe:2.3:a:samba:samba:4.0.5::::::: cpe:2.3:a:samba:samba:4.0.6::::::: cpe:2.3:a:samba:samba:4.0.7::::::: cpe:2.3:a:samba:samba:4.0.8::::::: cpe:2.3:a:samba:samba:4.0.9::::::: *cpe:2.3:a:s
Added	CVSS V2		(AV:N/AC:L/Au:S/C:N/I:N/A:P)
Added	CVSS V3		AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		CWE-264
Changed	Reference Type	http://www.securityfocus.com/bid/94994 No Types Assigned	http://www.securityfocus.com/bid/94994 Third Party Advisory, VDB Entry
Changed	Reference Type	http://www.securitytracker.com/id/1037495 No Types Assigned	http://www.securitytracker.com/id/1037495 Third Party Advisory, VDB Entry
Changed	Reference Type	https://www.samba.org/samba/security/CVE-2016-2126.html No Types Assigned	https://www.samba.org/samba/security/CVE-2016-2126.html Vendor Advisory

CVE Modified by MITRE - 7/27/2017 9:29:00 PM

Action

Type

Old Value

New Value

Changed

Description

** REJECT **  DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: The CNA or individual who requested this candidate did not associate it with any vulnerability during 2016. Notes: none.

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.

Changed

Display Vulnerability

false

true

Added

Reference

https://www.samba.org/samba/security/CVE-2016-2126.html [No Types Assigned]

Quick Info

CVE Dictionary Entry:
CVE-2016-2126
NVD Published Date:
05/11/2017
NVD Last Modified:
05/10/2018

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Information Technology Laboratory

National Vulnerability Database