What it is about

Samba ist eine Open Source Software Suite, die Druck- und Dateidienste für SMB/CIFS Clients implementiert. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Samba ausnutzen, um beliebigen Programmcode auszuführen oder Informationen offenzulegen.

Under what conditions?

Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.

What can happen in the worst case

An attacker could use the vulnerability to

• beliebigen Programmcode auszuführen oder Informationen offenzulegen

Am I affected?

Affected according to the BSI:

• Debian Linux
• Fedora Linux
• Ubuntu Linux
• SUSE Linux
• SUSE openSUSE
• Open Source Samba <4.23.2
• Open Source Samba <4.22.5
• Open Source Samba <4.21.9
• Dell NetWorker vProxy <19.14
• QNAP NAS QTS <5.2.8.3332 build 20251128
• QNAP NAS QuTS hero <h5.2.8.3321 build 20251117
• QNAP NAS QuTS hero <h5.3.2.3354 build 20251225

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

• Open Source Samba 4.23.2
• Open Source Samba 4.22.5
• Open Source Samba 4.21.9
• Dell NetWorker vProxy 19.14
• QNAP NAS QTS 5.2.8.3332 build 20251128
• QNAP NAS QuTS hero h5.2.8.3321 build 20251117
• QNAP NAS QuTS hero h5.3.2.3354 build 20251225

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.