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Ubuntu 18.04 and 16.04: USN-4510-1 Moderate Samba Network Access Issue

ubuntu
Calendar Grey September 17, 2020
Dist Ubuntu Esm H88
Addressed Samba connectivity issue in Ubuntu Security Update USN-4510-1. Adhere to the provided guidance for safe file sharing practices.
Samba would allow unintended access to files over the network.

Summary

Samba would allow unintended access to files over the network.

Software Description:

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

Details:

Tom Tervoort discovered that the Netlogon protocol implemented by Samba

incorrectly handled the authentication scheme. A remote attacker could use

this issue to forge an authentication token and steal the credentials of

the domain admin.

This update fixes the issue by changing the "server schannel" setting to

default to "yes", instead of "auto", which will force a secure netlogon

channel. This may result in compatibility issues with older devices. A

future update may allow a finer-grained control over this setting.

Topics%20covered

Topics Covered

security advisory security issue update samba authentication ubuntu network access

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-0ubuntu2.19

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.30

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

References

https://ubuntu.com/security/notices/USN-4510-1

CVE-2020-1472

September 17, 2020

Topics%20covered

Topics Covered

security advisory security issue update samba authentication ubuntu network access

Package Information

https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.19
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.30

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