CVE-2018-16851

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 from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

Samba, desde la versión 4.0.0 antes de las versiones 4.7.12, 4.8.7 y 4.9.3, es vulnerable a una denegación de servicio (DoS). Durante el procesamiento de una búsqueda LDAP antes de que el AD DC de Samba devuelva las entradas LDAP al cliente, las entradas se cachean en un único objeto de memoria con un tamaño máximo de 256 MB. Cuando se alcanza este tamaño, el proceso de Samba que proporciona el servicio LDAP seguirá el puntero NULL, terminando el proceso. No hay más vulnerabilidades asociadas a este problema, simplemente una denegación de servicio (DoS).

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-09-11 CVE Reserved
2018-11-27 CVE Published
2024-06-23 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (9)

URL	Tag	Source
http://www.securityfocus.com/bid/106027	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851	Issue Tracking
https://lists.debian.org/debian-lts-announce/2018/12/msg00005.html	Mailing List
https://security.netapp.com/advisory/ntap-20181127-0001	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://www.samba.org/samba/security/CVE-2018-16851.html	2022-08-29

URL	Date	SRC
https://security.gentoo.org/glsa/202003-52	2022-08-29
https://usn.ubuntu.com/3827-1	2022-08-29
https://usn.ubuntu.com/3827-2	2022-08-29
https://www.debian.org/security/2018/dsa-4345	2022-08-29

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 < 4.7.12 Search vendor "Samba" for product "Samba" and version " >= 4.0.0 < 4.7.12"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.8.0 < 4.8.7 Search vendor "Samba" for product "Samba" and version " >= 4.8.0 < 4.8.7"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.9.0 < 4.9.3 Search vendor "Samba" for product "Samba" and version " >= 4.9.0 < 4.9.3"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.10"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected