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Ubuntu Security Notice USN-3827-1
November 27, 2018

samba vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 18.10
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Samba.

Software Description:
– samba: SMB/CIFS file, print, and login server for Unix

Details:

Florian Stuelpner discovered that Samba incorrectly handled CNAME records.
A remote attacker could use this issue to cause Samba to crash, resulting
in a denial of service. (CVE-2018-14629)

Alex MacCuish discovered that Samba incorrectly handled memory when
configured to accept smart-card authentication. A remote attacker could
possibly use this issue to cause Samba to crash, resulting in a denial of
service. (CVE-2018-16841)

Garming Sam discovered that Samba incorrectly handled memory when
processing LDAP searches. A remote attacker could possibly use this issue
to cause Samba to crash, resulting in a denial of service. (CVE-2018-16851)

Update instructions:

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

Ubuntu 18.10:
samba 2:4.8.4+dfsg-2ubuntu2.1

Ubuntu 18.04 LTS:
samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.5

Ubuntu 16.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.16.04.18

Ubuntu 14.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.14.04.19

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

References:
https://usn.ubuntu.com/usn/usn-3827-1
CVE-2018-14629, CVE-2018-16841, CVE-2018-16851

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.8.4+dfsg-2ubuntu2.1
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.5
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.18
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.19

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