Ubuntu 4930-1: Samba vulnerability | LinuxSecurity.com
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Ubuntu Security Notice USN-4930-1
April 29, 2021

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

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Samba would allow unintended access to files over the network.

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

Details:

Peter Eriksson discovered that Samba incorrectly handled certain negative
idmap cache entries. This issue could result in certain users gaining
unauthorized access to files, contrary to expected behaviour.

Update instructions:

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

Ubuntu 21.04:
  samba                           2:4.13.3+dfsg-1ubuntu2.1

Ubuntu 20.10:
  samba                           2:4.12.5+dfsg-3ubuntu4.3

Ubuntu 20.04 LTS:
  samba                           2:4.11.6+dfsg-0ubuntu1.8

Ubuntu 18.04 LTS:
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.23

Ubuntu 16.04 LTS:
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.34

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

References:
  https://ubuntu.com/security/notices/USN-4930-1
  CVE-2021-20254

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.13.3+dfsg-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/samba/2:4.12.5+dfsg-3ubuntu4.3
  https://launchpad.net/ubuntu/+source/samba/2:4.11.6+dfsg-0ubuntu1.8
  https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.23
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.34

Ubuntu 4930-1: Samba vulnerability

April 29, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Samba would allow unintended access to files over the network. Software Description: - samba: SMB/CIFS file, print, and login server for Unix Details: Peter Eriksson discovered that Samba incorrectly handled certain negative idmap cache entries. This issue could result in certain users gaining unauthorized access to files, contrary to expected behaviour.

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: samba 2:4.13.3+dfsg-1ubuntu2.1 Ubuntu 20.10: samba 2:4.12.5+dfsg-3ubuntu4.3 Ubuntu 20.04 LTS: samba 2:4.11.6+dfsg-0ubuntu1.8 Ubuntu 18.04 LTS: samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.23 Ubuntu 16.04 LTS: samba 2:4.3.11+dfsg-0ubuntu0.16.04.34 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4930-1

CVE-2021-20254

Severity
Ubuntu Security Notice USN-4930-1

Package Information

https://launchpad.net/ubuntu/+source/samba/2:4.13.3+dfsg-1ubuntu2.1 https://launchpad.net/ubuntu/+source/samba/2:4.12.5+dfsg-3ubuntu4.3 https://launchpad.net/ubuntu/+source/samba/2:4.11.6+dfsg-0ubuntu1.8 https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.23 https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.34

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