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AUSCERT External Security Bulletin Redistribution
15 August 2018
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Existing Account
CVE Names: CVE-2018-10919 CVE-2018-10918 CVE-2018-10858
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USN-3738-1: Samba vulnerabilities
14 August 2018
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 LTS
Several security issues were fixed in Samba.
o samba - SMB/CIFS file, print, and login server for Unix
Svyatoslav Phirsov discovered that the Samba libsmbclient library incorrectly
handled extra long filenames. A malicious server could use this issue to cause
Samba to crash, resulting in a denial of service, or possibly execute arbitrary
Volker Mauel discovered that Samba incorrectly handled database output. When
used as an Active Directory Domain Controller, a remote authenticated attacker
could use this issue to cause Samba to crash, resulting in a denial of service.
This issue only affected Ubuntu 18.04 LTS. (CVE-2018-10918)
Phillip Kuhrt discovered that the Samba LDAP server incorrectly handled certain
confidential attribute values. A remote authenticated attacker could possibly
use this issue to obtain certain sensitive information. (CVE-2018-10919)
Vivek Das discovered that Samba incorrectly handled NTLMv1 being explicitly
disabled on the server. A remote user could possibly be authenticated using
NTLMv1, contrary to expectations. This issue only affected Ubuntu 18.04 LTS.
The problem can be corrected by updating your system to the following package
Ubuntu 18.04 LTS
libsmbclient - 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
Ubuntu 16.04 LTS
libsmbclient - 2:4.3.11+dfsg-0ubuntu0.16.04.15
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.15
Ubuntu 14.04 LTS
libsmbclient - 2:4.3.11+dfsg-0ubuntu0.14.04.16
samba - 2:4.3.11+dfsg-0ubuntu0.14.04.16
To update your system, please follow these instructions: https://
In general, a standard system update will make all the necessary changes.
(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
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