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Sicherheit: Pufferüberlauf in Samba
Aktuelle Meldungen Distributionen
Name: Pufferüberlauf in Samba
ID: USN-4930-1
Distribution: Ubuntu
Plattformen: Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10, Ubuntu 21.04
Datum: Do, 29. April 2021, 22:34
Referenzen: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20254
Applikationen: Samba

Originalnachricht

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From: Marc Deslauriers <marc.deslauriers@canonical.com>
Reply-To: Ubuntu Security <security@ubuntu.com>
To: "ubuntu-security-announce@lists.ubuntu.com"
<ubuntu-security-announce@lists.ubuntu.com>
Message-ID: <d8c4145c-ac92-a011-3afa-a57843e1c3e4@canonical.com>
Subject: [USN-4930-1] Samba vulnerability

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==========================================================================
Ubuntu Security Notice USN-4930-1
April 29, 2021

samba vulnerability
==========================================================================

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


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