CVE-2016-2126

samba: Flaws in Kerberos PAC validation can trigger privilege elevation

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Samba versiones 4.0.0 hasta 4.5.2, es vulnerable a la elevación de privilegios debido al manejo incorrecto de la suma de comprobación PAC (Certificado de Atributo de Privilegio). Un atacante autenticado y remoto puede hacer que el proceso winbindd se bloquee usando un ticket de Kerberos legítimo. Un servicio local con acceso a la tubería con privilegios de winbindd puede hacer que winbindd almacene en caché los permisos de acceso elevados.

A flaw was found in the way Samba handled PAC (Privilege Attribute Certificate) checksums. A remote, authenticated attacker could use this flaw to crash the winbindd process.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

Attack Vector

Adjacent

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-01-29 CVE Reserved
2016-12-19 CVE Published
2023-07-07 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (11)

URL	Tag	Source
http://www.securityfocus.com/bid/94994	Third Party Advisory
http://www.securitytracker.com/id/1037495	Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2017-0494.html	2022-08-29
http://rhn.redhat.com/errata/RHSA-2017-0495.html	2022-08-29
http://rhn.redhat.com/errata/RHSA-2017-0662.html	2022-08-29
http://rhn.redhat.com/errata/RHSA-2017-0744.html	2022-08-29
https://access.redhat.com/errata/RHSA-2017:1265	2022-08-29
https://www.samba.org/samba/security/CVE-2016-2126.html	2022-08-29
https://access.redhat.com/security/cve/CVE-2016-2126	2017-05-22
https://bugzilla.redhat.com/show_bug.cgi?id=1403115	2017-05-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.0.0 < 4.3.13 Search vendor "Samba" for product "Samba" and version " >= 4.0.0 < 4.3.13"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.4.0 < 4.4.8 Search vendor "Samba" for product "Samba" and version " >= 4.4.0 < 4.4.8"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.5.0 < 4.5.3 Search vendor "Samba" for product "Samba" and version " >= 4.5.0 < 4.5.3"		-		Affected