Ubuntu 5174-2: Samba regression

Advisories

==========================================================================
Ubuntu Security Notice USN-5174-2
December 13, 2021

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

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

- Ubuntu 18.04 LTS

Summary:

USN-5174-1 introduced a regression in Samba.

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

Details:

USN-5174-1 fixed vulnerabilities in Samba. Some of the 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 properly check sensitive
 attributes. An authenticated attacker could possibly use this issue to
 escalate privileges. (CVE-2020-25722)
  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 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.27

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

References:
  https://ubuntu.com/security/notices/USN-5174-2
  https://ubuntu.com/security/notices/USN-5174-1
  https://launchpad.net/bugs/1950363

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.27

Ubuntu 5174-2: Samba regression

December 13, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: USN-5174-1 introduced a regression in Samba. Software Description: - samba: SMB/CIFS file, print, and login server for Unix Details: USN-5174-1 fixed vulnerabilities in Samba. Some of the 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 properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722) 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 18.04 LTS: samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.27 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5174-2

https://ubuntu.com/security/notices/USN-5174-1

https://launchpad.net/bugs/1950363

Severity
Ubuntu Security Notice USN-5174-2

Package Information

https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.27

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