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Ubuntu Security Notice USN-4217-1

Ubuntu Security Notice USN-4217-1
Posted Dec 10, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4217-1 - Andreas Oster discovered that the Samba DNS management server incorrectly handled certain records. An authenticated attacker could possibly use this issue to crash Samba, resulting in a denial of service. Isaac Boukris discovered that Samba did not enforce the Kerberos DelegationNotAllowed feature restriction, contrary to expectations.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2019-14861, CVE-2019-14870
SHA-256 | 51b01c1767b0bdb132c8d865c0a4fae6ca8ba99c8b662d627473d2bc026ba909

Ubuntu Security Notice USN-4217-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4217-1
December 10, 2019

samba vulnerabilities
==========================================================================

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Samba.

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

Details:

Andreas Oster discovered that the Samba DNS management server incorrectly
handled certain records. An authenticated attacker could possibly use this
issue to crash Samba, resulting in a denial of service. (CVE-2019-14861)

Isaac Boukris discovered that Samba did not enforce the Kerberos
DelegationNotAllowed feature restriction, contrary to expectations.
(CVE-2019-14870)

Update instructions:

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

Ubuntu 19.10:
libsmbclient 2:4.10.7+dfsg-0ubuntu2.3
samba 2:4.10.7+dfsg-0ubuntu2.3

Ubuntu 19.04:
libsmbclient 2:4.10.0+dfsg-0ubuntu2.7
samba 2:4.10.0+dfsg-0ubuntu2.7

Ubuntu 18.04 LTS:
libsmbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.14

Ubuntu 16.04 LTS:
libsmbclient 2:4.3.11+dfsg-0ubuntu0.16.04.24
samba 2:4.3.11+dfsg-0ubuntu0.16.04.24

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

References:
https://usn.ubuntu.com/4217-1
CVE-2019-14861, CVE-2019-14870

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.10.7+dfsg-0ubuntu2.3
https://launchpad.net/ubuntu/+source/samba/2:4.10.0+dfsg-0ubuntu2.7
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.14
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.24
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