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CVE-2018-16851

Published: 27 November 2018

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
upstream
Released (4.7.12,4.8.7,4.9.3)
trusty
Released (2:4.3.11+dfsg-0ubuntu0.14.04.19)
xenial
Released (2:4.3.11+dfsg-0ubuntu0.16.04.18)
bionic
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.5)
cosmic
Released (2:4.8.4+dfsg-2ubuntu2.1)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H