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Ubuntu Security Notice USN-5142-3

Ubuntu Security Notice USN-5142-3
Posted Dec 14, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5142-3 - USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes introduced a regression in Kerberos authentication in certain environments. Please see the following upstream bug for more information: https://bugzilla.samba.org/show_bug.cgi?id=14922 This update fixes the problem. Various other issues were also addressed.

tags | advisory, web, cgi, vulnerability
systems | linux, ubuntu
advisories | CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3671, CVE-2021-3738
SHA-256 | c2c8fcea9831797fd889f4570b8becd0d331cdb36d976a471a6dba4dad44aa41

Ubuntu Security Notice USN-5142-3

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5142-3
December 13, 2021

samba regression
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

USN-5142-1 introduced a regression in Samba.

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

Details:

USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes
introduced a regression in Kerberos authentication in certain environments.

Please see the following upstream bug for more information:
https://bugzilla.samba.org/show_bug.cgi?id=14922

This update fixes the problem.

Original advisory details:

Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
Andrew Bartlett discovered that Samba incorrectly mapping domain users to
local users. An authenticated attacker could possibly use this issue to
become root on domain members. (CVE-2020-25717)
Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos
tickets issues by an RODC. An RODC could print administrator tickets,
contrary to expectations. (CVE-2020-25718)
Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets.
Delegated administrators could possibly use this issue to impersonate
accounts, leading to total domain compromise. (CVE-2020-25719)
Andrew Bartlett discovered that Samba did not provide stable AD
identifiers to Kerberos acceptors. (CVE-2020-25721)
Andrew Bartlett discovered that Samba did not properly check sensitive
attributes. An authenticated attacker could possibly use this issue to
escalate privileges. (CVE-2020-25722)
Stefan Metzmacher discovered that Samba incorrectly handled certain large
DCE/RPC requests. A remote attacker could possibly use this issue to
bypass signature requirements. (CVE-2021-23192)
William Ross discovered that Samba incorrectly handled memory. A remote
attacker could use this issue to cause Samba to crash, resulting in a
denial of service, or possibly escalate privileges. (CVE-2021-3738)
Joseph Sutton discovered that Samba incorrectly handled certain TGS
requests. An authenticated attacker could possibly use this issue to cause
Samba to crash, resulting in a denial of service. (CVE-2021-3671)
The fix for CVE-2020-25717 results in possible behaviour changes that could
affect certain environments. Please see the upstream advisory for more
information:
https://www.samba.org/samba/security/CVE-2020-25717.html

Update instructions:

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

Ubuntu 21.10:
samba 2:4.13.14+dfsg-0ubuntu0.21.10.4

Ubuntu 21.04:
samba 2:4.13.14+dfsg-0ubuntu0.21.04.4

Ubuntu 20.04 LTS:
samba 2:4.13.14+dfsg-0ubuntu0.20.04.4

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

References:
https://ubuntu.com/security/notices/USN-5142-3
https://ubuntu.com/security/notices/USN-5142-1
https://launchpad.net/bugs/1950363

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.13.14+dfsg-0ubuntu0.21.10.4
https://launchpad.net/ubuntu/+source/samba/2:4.13.14+dfsg-0ubuntu0.21.04.4
https://launchpad.net/ubuntu/+source/samba/2:4.13.14+dfsg-0ubuntu0.20.04.4

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