CVE-2018-16851 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

http://www.securityfocus.com/bid/106027 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851 https://lists.debian.org/debian-lts-announce/2018/12/msg00005.html https://security.gentoo.org/glsa/202003-52 https://security.netapp.com/advisory/ntap-20181127-0001/ https://usn.ubuntu.com/3827-1/ https://usn.ubuntu.com/3827-2/ https://www.debian.org/security/2018/dsa-4345 https://www.samba.org/samba/security/CVE-2018-16851.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5