USN-3738-1: Samba vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• samba - SMB/CIFS file, print, and login server for Unix

Details

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 code. (CVE-2018-10858)

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. (CVE-2018-1139)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04

• libsmbclient - 2:4.7.6+dfsg~ubuntu-0ubuntu2.2
• samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.2

Ubuntu 16.04

• libsmbclient - 2:4.3.11+dfsg-0ubuntu0.16.04.15
• samba - 2:4.3.11+dfsg-0ubuntu0.16.04.15

Ubuntu 14.04

• libsmbclient - 2:4.3.11+dfsg-0ubuntu0.14.04.16
• samba - 2:4.3.11+dfsg-0ubuntu0.14.04.16

In general, a standard system update will make all the necessary changes.

References

• CVE-2018-10858
• CVE-2018-10918
• CVE-2018-10919
• CVE-2018-1139