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CVE-2020-27840

Published: 24 March 2021

A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.

Notes

AuthorNote
mdeslaur
This issue is actually in the ldb package, the samba package
uses the system ldb library, not the included one

Priority

High

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
ldb
Launchpad, Ubuntu, Debian
bionic
Released (2:1.2.3-1ubuntu0.2)
focal
Released (2:2.0.10-0ubuntu0.20.04.3)
groovy
Released (2:2.1.4-2ubuntu0.1)
trusty
Released (1:1.1.24-0ubuntu0.14.04.2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (2:1.1.24-1ubuntu3.2)
Patches:
upstream: https://bugzilla.samba.org/attachment.cgi?id=16460 (master)
upstream: https://bugzilla.samba.org/attachment.cgi?id=16462 (4.13)
upstream: https://bugzilla.samba.org/attachment.cgi?id=16463 (4.12)
upstream: https://bugzilla.samba.org/attachment.cgi?id=16464 (4.11)




samba
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not compiled)
focal Not vulnerable
(code not compiled)
groovy Not vulnerable
(code not compiled)
trusty Not vulnerable
(code not compiled)
upstream Needs triage

xenial Not vulnerable
(code not compiled)
Patches:




upstream: https://bugzilla.samba.org/attachment.cgi?id=16460 (master)
upstream: https://bugzilla.samba.org/attachment.cgi?id=16462 (4.13)
upstream: https://bugzilla.samba.org/attachment.cgi?id=16463 (4.12)
upstream: https://bugzilla.samba.org/attachment.cgi?id=16464 (4.11)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H